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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>J</title>
<subtitle>Hello, Code.</subtitle>
<link href="https://jiruffe.com/atom.xml" rel="self"/>
<link href="https://jiruffe.com/"/>
<updated>2020-07-16T12:50:00.000Z</updated>
<id>https://jiruffe.com/</id>
<author>
<name>Jiruffe</name>
</author>
<generator uri="https://hexo.io/">Hexo</generator>
<entry>
<title>雪花算法的多种语言实现</title>
<link href="https://jiruffe.com/posts/3a657096/"/>
<id>https://jiruffe.com/posts/3a657096/</id>
<published>2020-07-16T12:50:00.000Z</published>
<updated>2020-07-16T12:50:00.000Z</updated>
<content type="html"><![CDATA[<div class="note default"><p>雪花 (snowflake) 算法是 Twitter 开源的分布式 ID 生成算法，可以在不引入 Redis 或 ZooKeeper 之类的中间件的情况下生成不重复且基本有序的 ID，在分布式系统中的应用十分广泛。<span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL3R3aXR0ZXIvc25vd2ZsYWtl">原始代码<i class="fa fa-external-link-alt"></i></span>是 Scala 实现的，我将其翻译成了 Java、C# 等多种语言的版本，源码在<span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvc25vd2ZsYWtl">这里<i class="fa fa-external-link-alt"></i></span>可以找到。</p></div><span id="more"></span><p>雪花算法的核心思想是将 64 bit 分为多个部分，在两次生成的 ID 的各个部分不全相等的情况下 ID 必然是不重复的。在不同实例上，由于数据中心编号和机器编号不同时相等，所以生成 ID 不重复；在同一实例上，时间戳可以很大程度上避免重复的可能，而一旦同一毫秒内有多次生成 ID 时，通过加锁等方式获取自增的序号即可，自增的序号占用 12 bit，足够一毫秒生成 4096 个不同 ID。</p><table><thead><tr><th align="center">保留</th><th align="center">时间戳</th><th align="center">数据中心编号</th><th align="center">机器编号</th><th align="center">序号</th></tr></thead><tbody><tr><td align="center">1 bit</td><td align="center">41 bit</td><td align="center">5 bit</td><td align="center">5 bit</td><td align="center">12 bit</td></tr><tr><td align="center">固定为0，防止出现负数</td><td align="center">当前时间戳 减 初始时间戳</td><td align="center"></td><td align="center"></td><td align="center">同一机器同一毫秒内自增</td></tr></tbody></table>]]></content>
<summary type="html"><div class="note default"><p>雪花 (snowflake) 算法是 Twitter 开源的分布式 ID 生成算法，可以在不引入 Redis 或 ZooKeeper 之类的中间件的情况下生成不重复且基本有序的 ID，在分布式系统中的应用十分广泛。<span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL3R3aXR0ZXIvc25vd2ZsYWtl">原始代码<i class="fa fa-external-link-alt"></i></span>是 Scala 实现的，我将其翻译成了 Java、C# 等多种语言的版本，源码在<span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvc25vd2ZsYWtl">这里<i class="fa fa-external-link-alt"></i></span>可以找到。</p>
</div></summary>
<category term="backend" scheme="https://jiruffe.com/categories/backend/"/>
<category term="java" scheme="https://jiruffe.com/tags/java/"/>
<category term="snowflake" scheme="https://jiruffe.com/tags/snowflake/"/>
<category term="distributed-system" scheme="https://jiruffe.com/tags/distributed-system/"/>
<category term="csharp" scheme="https://jiruffe.com/tags/csharp/"/>
<category term="php" scheme="https://jiruffe.com/tags/php/"/>
<category term="python" scheme="https://jiruffe.com/tags/python/"/>
<category term="go" scheme="https://jiruffe.com/tags/go/"/>
<category term="cpp" scheme="https://jiruffe.com/tags/cpp/"/>
<category term="c" scheme="https://jiruffe.com/tags/c/"/>
</entry>
<entry>
<title>Reinventing the Wheel: JSON Conversion Library (Ⅲ)</title>
<link href="https://jiruffe.com/posts/528df58f/"/>
<id>https://jiruffe.com/posts/528df58f/</id>
<published>2019-04-17T06:41:21.000Z</published>
<updated>2019-04-17T06:41:21.000Z</updated>
<content type="html"><![CDATA[<div class="note default"><p>Building a Java library which implements JSON conversion between JSON strings and Java beans. The source code is available in <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvamlyYWZmZQ==">here<i class="fa fa-external-link-alt"></i></span>.</p></div><span id="more"></span><h1 id="Object-JSONElement"><a href="#Object-JSONElement" class="headerlink" title="Object => JSONElement"></a>Object => JSONElement</h1><p>Firstly, check the type of the object to see if it can be directly converted to JSONPrimitive, JSONList, JSONMap. Otherwise, treat it as a record and use reflection to extract the field name and value and convert it to JSONMap.</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> JSONElement <span class="title function_">analyze</span><span class="params">(Object o)</span> {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="literal">null</span> == o) {</span><br><span class="line"> <span class="keyword">return</span> JSONElement.theVoid();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> JSONElement) {</span><br><span class="line"> <span class="keyword">return</span> (JSONElement) o;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> Class<?> cls = o.getClass();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> String) {</span><br><span class="line"> <span class="keyword">return</span> JSONElement.newPrimitive(o);</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Number) {</span><br><span class="line"> <span class="keyword">return</span> JSONElement.newPrimitive(o);</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (TypeUtil.isPrimitive(o)) {</span><br><span class="line"> <span class="keyword">return</span> JSONElement.newPrimitive(o);</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (cls.isEnum()) {</span><br><span class="line"> <span class="keyword">return</span> JSONElement.newPrimitive(((Enum) o).ordinal());</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (cls.isArray()) {</span><br><span class="line"> <span class="type">JSONElement</span> <span class="variable">list</span> <span class="operator">=</span> JSONElement.newList();</span><br><span class="line"> <span class="keyword">for</span> (<span class="type">int</span> <span class="variable">i</span> <span class="operator">=</span> <span class="number">0</span>; i < Array.getLength(o); i++) {</span><br><span class="line"> list.offer(analyze(Array.get(o, i)));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> list;</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Iterable) {</span><br><span class="line"> <span class="type">JSONElement</span> <span class="variable">list</span> <span class="operator">=</span> JSONElement.newList();</span><br><span class="line"> <span class="keyword">for</span> (Object oo : (Iterable) o) {</span><br><span class="line"> list.offer(analyze(oo));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> list;</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Enumeration) {</span><br><span class="line"> <span class="type">JSONElement</span> <span class="variable">list</span> <span class="operator">=</span> JSONElement.newList();</span><br><span class="line"> <span class="type">Enumeration</span> <span class="variable">es</span> <span class="operator">=</span> (Enumeration) o;</span><br><span class="line"> <span class="keyword">while</span> (es.hasMoreElements()) {</span><br><span class="line"> list.offer(analyze(es.nextElement()));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> list;</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Map) {</span><br><span class="line"> <span class="type">JSONElement</span> <span class="variable">map</span> <span class="operator">=</span> JSONElement.newMap();</span><br><span class="line"> <span class="keyword">for</span> (Object e : ((Map) o).entrySet()) {</span><br><span class="line"> map.offer(StringUtil.toString(((Map.Entry) e).getKey()), analyze(((Map.Entry) e).getValue()));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> map;</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Dictionary) {</span><br><span class="line"> <span class="type">JSONElement</span> <span class="variable">map</span> <span class="operator">=</span> JSONElement.newMap();</span><br><span class="line"> <span class="type">Enumeration</span> <span class="variable">keys</span> <span class="operator">=</span> ((Dictionary) o).keys();</span><br><span class="line"> <span class="keyword">while</span> (keys.hasMoreElements()) {</span><br><span class="line"> <span class="type">Object</span> <span class="variable">k</span> <span class="operator">=</span> keys.nextElement();</span><br><span class="line"> map.offer(StringUtil.toString(k), analyze(((Dictionary) o).get(k)));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> map;</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="type">JSONElement</span> <span class="variable">map</span> <span class="operator">=</span> JSONElement.newMap();</span><br><span class="line"> <span class="keyword">for</span> (Field f : ObjectUtil.getFields(cls)) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> map.offer(f.getName(), analyze(f.get(o)));</span><br><span class="line"> } <span class="keyword">catch</span> (IllegalAccessException ignored) {</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> map;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure><h1 id="JSONElement-Object"><a href="#JSONElement-Object" class="headerlink" title="JSONElement => Object"></a>JSONElement => Object</h1><p>The basic idea is to get the field name of the target type and then take the value into recursion.</p><p>The source code is too long to show it here. Check <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvamlyYWZmZS9ibG9iL21hc3Rlci9zcmMvbWFpbi9qYXZhL2NvbS9qaXJ1ZmZlL2ppcmFmZmUvYW5hbHl6ZXIvT2JqZWN0QW5hbHl6ZXIuamF2YQ==">ObjectAnalyzer<i class="fa fa-external-link-alt"></i></span> instead.</p>]]></content>
<summary type="html"><div class="note default"><p>Building a Java library which implements JSON conversion between JSON strings and Java beans. The source code is available in <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvamlyYWZmZQ==">here<i class="fa fa-external-link-alt"></i></span>.</p>
</div></summary>
<category term="algorithm" scheme="https://jiruffe.com/categories/algorithm/"/>
<category term="reinventing-the-wheel" scheme="https://jiruffe.com/tags/reinventing-the-wheel/"/>
<category term="java" scheme="https://jiruffe.com/tags/java/"/>
<category term="json" scheme="https://jiruffe.com/tags/json/"/>
</entry>
<entry>
<title>Reinventing the Wheel: JSON Conversion Library (Ⅱ)</title>
<link href="https://jiruffe.com/posts/79a0a64c/"/>
<id>https://jiruffe.com/posts/79a0a64c/</id>
<published>2019-04-16T07:50:38.000Z</published>
<updated>2019-04-16T07:50:38.000Z</updated>
<content type="html"><![CDATA[<div class="note default"><p>Building a Java library which implements JSON conversion between JSON strings and Java beans. The source code is available in <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvamlyYWZmZQ==">here<i class="fa fa-external-link-alt"></i></span>.</p></div><span id="more"></span><h1 id="String-JSONElement"><a href="#String-JSONElement" class="headerlink" title="String => JSONElement"></a>String => JSONElement</h1><p>Briefly, the basic idea is creating sub-elements during the traversal of json string. So traversing the json string, handling the keywords, and expecting the time complexity to be O(n).</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> (<span class="type">char</span> c : json.toCharArray()) {</span><br><span class="line"> <span class="keyword">switch</span> (c) {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">case</span> <span class="string">'"'</span>:</span><br><span class="line"> <span class="keyword">case</span> <span class="string">'\''</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">case</span> <span class="string">'{'</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">case</span> <span class="string">'['</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">case</span> <span class="string">':'</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">case</span> <span class="string">','</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">case</span> <span class="string">'}'</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">case</span> <span class="string">']'</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">default</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>See <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvamlyYWZmZS9ibG9iL21hc3Rlci9zcmMvbWFpbi9qYXZhL2NvbS9qaXJ1ZmZlL2ppcmFmZmUvYW5hbHl6ZXIvU3RyaW5nQW5hbHl6ZXIuamF2YQ==">StringAnalyzer<i class="fa fa-external-link-alt"></i></span> for more details.</p><h1 id="JSONElement-String"><a href="#JSONElement-String" class="headerlink" title="JSONElement => String"></a>JSONElement => String</h1><p>Much easier than <a href="#string-gt-JSONElement">string => JSONElement</a>. Recursively read sub-elements and append its value to a <code>StringBuilder</code>.</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">analyze</span><span class="params">(JSONElement element)</span> {</span><br><span class="line"></span><br><span class="line"> <span class="type">StringBuilder</span> <span class="variable">sb</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">StringBuilder</span>();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">switch</span> (element.getType()) {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">case</span> LIST:</span><br><span class="line"> sb.append(<span class="string">'['</span>);</span><br><span class="line"> Iterator<JSONElement.Entry> iterator = element.iterator();</span><br><span class="line"> <span class="keyword">while</span> (iterator.hasNext()) {</span><br><span class="line"> sb.append(analyze(iterator.next().getElement()));</span><br><span class="line"> <span class="keyword">if</span> (iterator.hasNext()) {</span><br><span class="line"> sb.append(<span class="string">','</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> sb.append(<span class="string">']'</span>);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">case</span> MAP:</span><br><span class="line"> sb.append(<span class="string">'{'</span>);</span><br><span class="line"> Iterator<JSONElement.Entry> iterator1 = element.iterator();</span><br><span class="line"> <span class="keyword">while</span> (iterator1.hasNext()) {</span><br><span class="line"> JSONElement.<span class="type">Entry</span> <span class="variable">e</span> <span class="operator">=</span> iterator1.next();</span><br><span class="line"> sb.append(<span class="string">'"'</span>);</span><br><span class="line"> sb.append(StringUtil.escape(StringUtil.toString(e.getKey())));</span><br><span class="line"> sb.append(<span class="string">'"'</span>);</span><br><span class="line"> sb.append(<span class="string">':'</span>);</span><br><span class="line"> sb.append(analyze(e.getElement()));</span><br><span class="line"> <span class="keyword">if</span> (iterator1.hasNext()) {</span><br><span class="line"> sb.append(<span class="string">','</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> sb.append(<span class="string">'}'</span>);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">case</span> PRIMITIVE:</span><br><span class="line"> <span class="type">Object</span> <span class="variable">v</span> <span class="operator">=</span> element.asValue();</span><br><span class="line"> <span class="keyword">if</span> (v <span class="keyword">instanceof</span> String) {</span><br><span class="line"> sb.append(<span class="string">'"'</span>);</span><br><span class="line"> sb.append(StringUtil.escape((String) v));</span><br><span class="line"> sb.append(<span class="string">'"'</span>);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> sb.append(StringUtil.toString(v));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">case</span> VOID:</span><br><span class="line"> sb.append(StringUtil.NULL);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">default</span>:</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> sb.toString();</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure>]]></content>
<summary type="html"><div class="note default"><p>Building a Java library which implements JSON conversion between JSON strings and Java beans. The source code is available in <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvamlyYWZmZQ==">here<i class="fa fa-external-link-alt"></i></span>.</p>
</div></summary>
<category term="algorithm" scheme="https://jiruffe.com/categories/algorithm/"/>
<category term="reinventing-the-wheel" scheme="https://jiruffe.com/tags/reinventing-the-wheel/"/>
<category term="java" scheme="https://jiruffe.com/tags/java/"/>
<category term="json" scheme="https://jiruffe.com/tags/json/"/>
</entry>
<entry>
<title>Reinventing the Wheel: JSON Conversion Library (Ⅰ)</title>
<link href="https://jiruffe.com/posts/60bb970d/"/>
<id>https://jiruffe.com/posts/60bb970d/</id>
<published>2019-04-16T05:56:37.000Z</published>
<updated>2019-04-16T05:56:37.000Z</updated>
<content type="html"><![CDATA[<div class="note default"><p>Building a Java library which implements JSON conversion between JSON strings and Java beans. The source code is available in <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvamlyYWZmZQ==">here<i class="fa fa-external-link-alt"></i></span>.</p></div><span id="more"></span><h1 id="Types"><a href="#Types" class="headerlink" title="Types"></a>Types</h1><p>At the beginning, we may need a basic class that represents all the data types of JSON including array <code>[]</code>, object <code>{}</code>, value <code>112358.0</code>, and even <code>null</code> or <code>undefined</code>. It provides interfaces accessing and modifying itself or its sub-elements. Like this</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class</span> <span class="title class_">JSONElement</span> {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> JSONElement <span class="title function_">peek</span><span class="params">(Object k)</span> {</span><br><span class="line"> <span class="comment">// <span class="doctag">TODO:</span> return the specific sub-element</span></span><br><span class="line"> <span class="keyword">return</span> <span class="literal">null</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> JSONElement <span class="title function_">offer</span><span class="params">(Object v)</span> {</span><br><span class="line"> <span class="comment">// <span class="doctag">TODO:</span> add the value to the array</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">// return the element itself for method chaining</span></span><br><span class="line"> <span class="keyword">return</span> <span class="built_in">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> JSONElement <span class="title function_">offer</span><span class="params">(Object k, Object v)</span> {</span><br><span class="line"> <span class="comment">// <span class="doctag">TODO:</span> add the value to the object with specified key</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">// return the element itself for method chaining</span></span><br><span class="line"> <span class="keyword">return</span> <span class="built_in">this</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>And the derived classes representing each JSON data type. Using <code>List</code> to simulate <code>[]</code>, and <code>Map</code> to simulate <code>{}</code>.</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">final</span> <span class="keyword">class</span> <span class="title class_">JSONList</span> <span class="keyword">extends</span> <span class="title class_">JSONElement</span> {</span><br><span class="line"> <span class="keyword">private</span> List<JSONElement> _sub_elements;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">final</span> <span class="keyword">class</span> <span class="title class_">JSONMap</span> <span class="keyword">extends</span> <span class="title class_">JSONElement</span> {</span><br><span class="line"> <span class="keyword">private</span> Map<Object, JSONElement> _sub_elements;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">final</span> <span class="keyword">class</span> <span class="title class_">JSONPrimitive</span> <span class="keyword">extends</span> <span class="title class_">JSONElement</span> {</span><br><span class="line"> <span class="keyword">private</span> Object _value;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">final</span> <span class="keyword">class</span> <span class="title class_">JSONVoid</span> <span class="keyword">extends</span> <span class="title class_">JSONElement</span> {</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * The singleton instance of {<span class="doctag">@link</span> JSONVoid}.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">static</span> <span class="keyword">final</span> <span class="type">JSONVoid</span> <span class="variable">INSTANCE</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">JSONVoid</span>();</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h1 id="Interfaces"><a href="#Interfaces" class="headerlink" title="Interfaces"></a>Interfaces</h1><p>A <code>JSON</code> class that providing methods named JS-like (<code>JSON.stringify</code>, <code>JSON.parse</code>) may helps while using.</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class</span> <span class="title class_">JSON</span> {</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Serializes Java {<span class="doctag">@link</span> Object} to {<span class="doctag">@link</span> JSONElement}.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> o the {<span class="doctag">@link</span> Object} to be serialized.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> the {<span class="doctag">@link</span> JSONElement} serialized.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> JSONElement <span class="title function_">serialize</span><span class="params">(Object o)</span> {</span><br><span class="line"> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> JSONElement) {</span><br><span class="line"> <span class="keyword">return</span> (JSONElement) o;</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">return</span> ObjectAnalyzer.analyze(o);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Deserializes JSON {<span class="doctag">@link</span> String} to {<span class="doctag">@link</span> JSONElement}.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> json the JSON {<span class="doctag">@link</span> String} to be deserialized.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> the {<span class="doctag">@link</span> JSONElement} deserialized.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> JSONElement <span class="title function_">deserialize</span><span class="params">(String json)</span> {</span><br><span class="line"> <span class="keyword">return</span> StringAnalyzer.analyze(json);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Directly serializes Java {<span class="doctag">@link</span> Object} to JSON {<span class="doctag">@link</span> String}.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> o the {<span class="doctag">@link</span> Object} to be serialized.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> the JSON {<span class="doctag">@link</span> String} serialized.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">stringify</span><span class="params">(Object o)</span> {</span><br><span class="line"> <span class="keyword">if</span> (o <span class="keyword">instanceof</span> JSONElement) {</span><br><span class="line"> <span class="keyword">return</span> StringAnalyzer.analyze((JSONElement) o);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">return</span> DirectAnalyzer.analyze(o);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Directly deserializes JSON {<span class="doctag">@link</span> String} to Java {<span class="doctag">@link</span> Object}.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> json the JSON {<span class="doctag">@link</span> String} to be deserialized.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> target the target {<span class="doctag">@link</span> Type}.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> <T> the target {<span class="doctag">@link</span> Type}.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> the Java {<span class="doctag">@link</span> Object} deserialized.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <T> T <span class="title function_">parse</span><span class="params">(String json, Type target)</span> {</span><br><span class="line"> <span class="keyword">if</span> (target <span class="keyword">instanceof</span> Class && JSONElement.class.isAssignableFrom((Class) target)) {</span><br><span class="line"> <span class="keyword">return</span> (T) StringAnalyzer.analyze(json);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">return</span> DirectAnalyzer.analyze(json, target);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>So far, nothing special but that we created some contentless classes. Completing the <code>StringAnalyzer</code> and <code>ObjectAnalyzer</code> in the next posts.</p>]]></content>
<summary type="html"><div class="note default"><p>Building a Java library which implements JSON conversion between JSON strings and Java beans. The source code is available in <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2ppcnVmZmUvamlyYWZmZQ==">here<i class="fa fa-external-link-alt"></i></span>.</p>
</div></summary>
<category term="algorithm" scheme="https://jiruffe.com/categories/algorithm/"/>
<category term="reinventing-the-wheel" scheme="https://jiruffe.com/tags/reinventing-the-wheel/"/>
<category term="java" scheme="https://jiruffe.com/tags/java/"/>
<category term="json" scheme="https://jiruffe.com/tags/json/"/>
</entry>
<entry>
<title>RK3399 + ALC5640 声音忽大忽小</title>
<link href="https://jiruffe.com/posts/fa792909/"/>
<id>https://jiruffe.com/posts/fa792909/</id>
<published>2019-04-04T04:49:35.000Z</published>
<updated>2019-04-04T04:49:35.000Z</updated>
<content type="html"><![CDATA[<div class="note default"><p>在 RK3399 上使用 Android 7.1，扬声器发出的声音总是忽大忽小，就像是应用程序接到了失去焦点事件<code>AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK</code>然后主动降低音量一样。</p></div><span id="more"></span><p>更新了<code>tinyalsa</code>部分的代码然后重新打包 framework 问题不再复现</p><img data-src="/posts/fa792909/rk_commit_c8c922e8.png" class="" title="rk_commit_c8c922e8">]]></content>
<summary type="html"><div class="note default"><p>在 RK3399 上使用 Android 7.1，扬声器发出的声音总是忽大忽小，就像是应用程序接到了失去焦点事件<code>AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK</code>然后主动降低音量一样。</p>
</div></summary>
<category term="embed" scheme="https://jiruffe.com/categories/embed/"/>
<category term="rk3399" scheme="https://jiruffe.com/tags/rk3399/"/>
<category term="alc5640" scheme="https://jiruffe.com/tags/alc5640/"/>
<category term="android" scheme="https://jiruffe.com/tags/android/"/>
</entry>
<entry>
<title>MPU-6050 运动检测中断不触发</title>
<link href="https://jiruffe.com/posts/4fbcecef/"/>
<id>https://jiruffe.com/posts/4fbcecef/</id>
<published>2019-03-13T02:01:49.000Z</published>
<updated>2019-03-13T02:01:49.000Z</updated>
<content type="html"><![CDATA[<div class="note default"><p>在使用 STM32 + MPU-6050 的时候，期望 STM32 进入停止模式后靠 MPU-6050 的运动检测来触发 STM32 的外部中断唤醒。却发现 INT 脚一直为高，不拉低。</p></div><span id="more"></span><p>根据 MPU-6050 的 datasheet</p><img data-src="/posts/4fbcecef/mpu6050_register_56_4_0.png" class="" title="mpu6050_register_56_4_0"><p>在初始化时配置了中断</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">MPU_Write_Byte(MPU_INTBP_CFG_REG, <span class="number">0xA0</span>); <span class="comment">// INT引脚低电平有效</span></span><br><span class="line">MPU_Write_Byte(MPU_MDETECT_CTRL_REG, <span class="number">0x1F</span>); <span class="comment">// 运动检测延时 200ms</span></span><br><span class="line">MPU_Write_Byte(MPU_MOTION_DET_REG, <span class="number">0x01</span>); <span class="comment">// 运动检测中断阈值</span></span><br><span class="line">MPU_Write_Byte(MPU_INT_EN_REG, <span class="number">0x40</span>); <span class="comment">// 开启运动检测中断</span></span><br></pre></td></tr></table></figure><p>结果 INT 脚却始终为高，怎么晃动都不拉低。</p><p>原来是看的 datasheet 版本太老了，新版本已经没有这个运动检测中断了。</p><img data-src="/posts/4fbcecef/mpu6050_register_56_4_2.png" class="" title="mpu6050_register_56_4_2"><p>于是只好在停止模式下用 RTC 闹钟定时检查加速度的变化。</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line">ENTERSTOPMODE:</span><br><span class="line"> </span><br><span class="line"> <span class="comment">// 开启 RTC 闹钟 用以喂狗</span></span><br><span class="line"> IWDG_Feed();</span><br><span class="line"> dev_rtc_setAlarm(<span class="number">3</span>);</span><br><span class="line"> IWDG_Feed();</span><br><span class="line"> </span><br><span class="line"> DEBUG_MSG(<span class="string">"standby mode entered\r\n"</span>);</span><br><span class="line"> IWDG_Feed();</span><br><span class="line"> </span><br><span class="line"> <span class="comment">// 进入停止模式</span></span><br><span class="line"> PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);</span><br><span class="line"> </span><br><span class="line"> <span class="comment">//DEBUG_MSG("standby mode exited\r\n");</span></span><br><span class="line"> </span><br><span class="line"> <span class="comment">// 是RTC闹钟唤醒的</span></span><br><span class="line"> <span class="keyword">if</span> (dev_rtc_isAlarm()) {</span><br><span class="line"> <span class="comment">//DEBUG_MSG("it's the RTC alarm, just feed watch dog\r\n");</span></span><br><span class="line"> <span class="comment">// 喂狗</span></span><br><span class="line"> IWDG_Feed();</span><br><span class="line"> </span><br><span class="line"> <span class="comment">// 检查新的加速度</span></span><br><span class="line"> MPU_Get_Accelerometer(&t_aacx, &t_aacy,&t_aacz);</span><br><span class="line"> <span class="keyword">if</span> (<span class="built_in">abs</span>(t_aacx - aacx) > THRESHOLD_ACCELEROMETER_CHANGE || <span class="built_in">abs</span>(t_aacy - aacy) > THRESHOLD_ACCELEROMETER_CHANGE || <span class="built_in">abs</span>(t_aacz - aacz) > THRESHOLD_ACCELEROMETER_CHANGE) {</span><br><span class="line"> <span class="comment">// 利用看门狗重启</span></span><br><span class="line"> <span class="keyword">while</span> (<span class="number">1</span>) {;}</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 喂完狗继续进入停止模式</span></span><br><span class="line"> <span class="keyword">goto</span> ENTERSTOPMODE;</span><br><span class="line"> }</span><br><span class="line"></span><br></pre></td></tr></table></figure>]]></content>
<summary type="html"><div class="note default"><p>在使用 STM32 + MPU-6050 的时候，期望 STM32 进入停止模式后靠 MPU-6050 的运动检测来触发 STM32 的外部中断唤醒。却发现 INT 脚一直为高，不拉低。</p>
</div></summary>
<category term="embed" scheme="https://jiruffe.com/categories/embed/"/>
<category term="stm32" scheme="https://jiruffe.com/tags/stm32/"/>
<category term="mpu6050" scheme="https://jiruffe.com/tags/mpu6050/"/>
</entry>
<entry>
<title>Hexo + GitHub Pages 搭建个人博客</title>
<link href="https://jiruffe.com/posts/4985a7ca/"/>
<id>https://jiruffe.com/posts/4985a7ca/</id>
<published>2019-03-07T10:00:03.000Z</published>
<updated>2019-03-07T10:00:03.000Z</updated>
<content type="html"><![CDATA[<div class="note default"><p>你正在浏览的<a href="https://jiruffe.com/">这个博客本身</a>就是 Hexo 实现的。<span class="exturl" data-url="aHR0cHM6Ly9oZXhvLmlvLw==">Hexo<i class="fa fa-external-link-alt"></i></span>是一个“快速、简洁且高效的博客框架”，支持<code>GitHub Flavored Markdown</code>，支持主题和插件。其生成的是静态网页，可以直接部署在<span class="exturl" data-url="aHR0cHM6Ly9oZWxwLmdpdGh1Yi5jb20vZW4vYXJ0aWNsZXMvd2hhdC1pcy1naXRodWItcGFnZXM=">GitHub Pages<i class="fa fa-external-link-alt"></i></span>上。</p></div><span id="more"></span><h1 id="安装"><a href="#安装" class="headerlink" title="安装"></a>安装</h1><p>以下都是在 Mac 上的操作，其他系统上可能有些不同</p><h2 id="brew"><a href="#brew" class="headerlink" title="brew"></a>brew</h2><p>Mac 上的包管理工具，为了方便装其他工具，<span class="exturl" data-url="aHR0cHM6Ly9icmV3LnNoLw==">官网<i class="fa fa-external-link-alt"></i></span>上就可以找到安装方法:</p><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"</span><br></pre></td></tr></table></figure><p>装完后可以执行下</p><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">brew update</span><br><span class="line">brew upgrade</span><br></pre></td></tr></table></figure><h2 id="git"><a href="#git" class="headerlink" title="git"></a>git</h2><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">brew install git</span><br></pre></td></tr></table></figure><p>或者装<span class="exturl" data-url="aHR0cHM6Ly9kZXZlbG9wZXIuYXBwbGUuY29tL3hjb2RlLw==">XCode<i class="fa fa-external-link-alt"></i></span></p><h2 id="node-js"><a href="#node-js" class="headerlink" title="node.js"></a>node.js</h2><p>可以直接去<span class="exturl" data-url="aHR0cHM6Ly9ub2RlanMub3JnLw==">官网<i class="fa fa-external-link-alt"></i></span>下，这里更推荐用<span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2NyZWF0aW9uaXgvbnZt">nvm<i class="fa fa-external-link-alt"></i></span></p><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.34.0/install.sh | bash</span><br><span class="line">nvm install stable</span><br></pre></td></tr></table></figure><h2 id="hexo"><a href="#hexo" class="headerlink" title="hexo"></a>hexo</h2><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">npm install hexo-cli -g</span><br></pre></td></tr></table></figure><h1 id="写作"><a href="#写作" class="headerlink" title="写作"></a>写作</h1><p>东西都安装好了！现在创建一个工作目录<code>hexo-blog</code>，然后在目录内执行</p><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">hexo init</span><br></pre></td></tr></table></figure><p>一个hexo项目就创建完成了！可以看到这样的目录结构</p><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">hexo-blog/</span><br><span class="line">├── _config.yml # 项目的配置</span><br><span class="line">├── node_modules # node依赖</span><br><span class="line">├── package-lock.json # node依赖描述</span><br><span class="line">├── package.json # node依赖描述</span><br><span class="line">├── public # 输出的静态网站</span><br><span class="line">├── scaffolds # 模版</span><br><span class="line">├── source # 源码</span><br><span class="line">└── themes # 主题</span><br></pre></td></tr></table></figure><p>然后用</p><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">hexo new hello</span><br></pre></td></tr></table></figure><p>就可以创建出一篇标题为 hello 的新文章，文件在<code>./source/_post/hello.md</code></p><h2 id="Front-matter"><a href="#Front-matter" class="headerlink" title="Front-matter"></a>Front-matter</h2><p>文件最上方<code>---</code>包含的就是<code>Front-matter</code>，用来设置文章的标题、日期、分类、标签等属性</p><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">---</span><br><span class="line">title: hello</span><br><span class="line">date: 2019-03-07 18:00:03</span><br><span class="line">tags:</span><br><span class="line">---</span><br></pre></td></tr></table></figure><p>可以参考<span class="exturl" data-url="aHR0cHM6Ly9oZXhvLmlvL3poLWNuL2RvY3MvZnJvbnQtbWF0dGVy">官方文档<i class="fa fa-external-link-alt"></i></span></p><h2 id="文章内容"><a href="#文章内容" class="headerlink" title="文章内容"></a>文章内容</h2><p>文章内容默认用<code>Markdown</code>语法，可以看<span class="exturl" data-url="aHR0cHM6Ly9ndWlkZXMuZ2l0aHViLmNvbS9mZWF0dXJlcy9tYXN0ZXJpbmctbWFya2Rvd24v">GitHub Guides<i class="fa fa-external-link-alt"></i></span></p><p>想要在首页展示一个<code>阅读全文</code>按钮而不是全文展示，只需要在文章中间加入一行<code><!-- more --></code>，首页上就只会展示这个标记之前的内容了</p><h1 id="调试"><a href="#调试" class="headerlink" title="调试"></a>调试</h1><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">hexo s</span><br></pre></td></tr></table></figure><p>然后用浏览器打开<code>http://localhost:4000</code>就可以看到展示效果了</p><p>加入 debug 参数可以看到更多调试输出</p><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">hexo s --debug</span><br></pre></td></tr></table></figure><h1 id="部署"><a href="#部署" class="headerlink" title="部署"></a>部署</h1><ol><li><p>在GitHub 上新建一个仓库，取名为<code><username>.github.io</code>，<code><username></code>要替换成你自己的 GitHub username</p></li><li><p>在 Hexo 工作目录下执行</p></li></ol><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">npm install hexo-deployer-git --save</span><br></pre></td></tr></table></figure><ol><li>打开 Hexo 工作目录下的<code>_config.yml</code>，找到<code>deploy</code>节点，配置成这样</li></ol><figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">deploy:</span></span><br><span class="line"> <span class="attr">type:</span> <span class="string">git</span></span><br><span class="line"> <span class="attr">repo:</span> <span class="string">git@github.com:<username>/<username>.github.io.git</span></span><br><span class="line"> <span class="attr">branch:</span> <span class="string">master</span></span><br></pre></td></tr></table></figure><pre><code>同样的，`<username>`要替换成你自己的 GitHub username</code></pre><ol><li>执行</li></ol><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">hexo clean</span><br><span class="line">hexo g --d</span><br></pre></td></tr></table></figure><ol><li>完成了！现在打开<code>https://<username>.github.io</code>就是部署好之后的博客了。<blockquote><p>如果想使用自己的域名</p><blockquote><ol><li>在<code>source</code>目录下创建一个名为<code>CNAME</code>的文件（文件名必须全大写），里面写上你的域名</li><li>重新执行部署</li><li>在你的域名服务商中增加记录值为<code><username>.github.io</code>的<code>CNAME</code>解析</li></ol></blockquote><p>就可以啦。</p></blockquote></li></ol><h1 id="主题"><a href="#主题" class="headerlink" title="主题"></a>主题</h1><ul><li><span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL3RoZW1lLW5leHQvaGV4by10aGVtZS1uZXh0">NexT<i class="fa fa-external-link-alt"></i></span> <figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">git clone https://github.com/theme-next/hexo-theme-next themes/next</span><br></pre></td></tr></table></figure> 然后打开<code>_config.yml</code>将<code>theme</code>节点设置成<code>theme: next</code></li></ul><h1 id="插件"><a href="#插件" class="headerlink" title="插件"></a>插件</h1><ul><li><p><span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2NoZW56aHV0aWFuL2hleG8tYWxsLW1pbmlmaWVy">hexo-all-minifier<i class="fa fa-external-link-alt"></i></span></p> <figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">brew install libtool automake autoconf nasm</span><br><span class="line">npm install hexo-all-minifier --save</span><br></pre></td></tr></table></figure><p> 可以压缩生成的html、js、css和图片</p><blockquote><p>实际用下来发现有些BUG，不要开启<code>js_concator</code>和<code>image_minifier</code>这两项功能</p></blockquote></li><li><p><span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL3d6cGFuL2hleG8tZ2VuZXJhdG9yLXNlYXJjaA==">local-search<i class="fa fa-external-link-alt"></i></span></p> <figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">npm install hexo-generator-search --save</span><br><span class="line">npm install hexo-generator-searchdb --save</span><br></pre></td></tr></table></figure><p> 然后编辑<code>_config.yml</code>增加</p> <figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">search:</span></span><br><span class="line"> <span class="attr">path:</span> <span class="string">search.xml</span></span><br><span class="line"> <span class="attr">field:</span> <span class="string">post</span></span><br><span class="line"> <span class="attr">format:</span> <span class="string">html</span></span><br><span class="line"> <span class="attr">limit:</span> <span class="number">10000</span></span><br></pre></td></tr></table></figure><p> 以及修改<code>themes/next/_config.yml</code>的<code>local_search</code>节点</p> <figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">local_search:</span></span><br><span class="line"> <span class="attr">enable:</span> <span class="literal">true</span></span><br></pre></td></tr></table></figure><p> 可以给网站增加一个搜索功能</p></li></ul>]]></content>
<summary type="html"><div class="note default"><p>你正在浏览的<a href="https://jiruffe.com/">这个博客本身</a>就是 Hexo 实现的。<span class="exturl" data-url="aHR0cHM6Ly9oZXhvLmlvLw==">Hexo<i class="fa fa-external-link-alt"></i></span>是一个“快速、简洁且高效的博客框架”，支持<code>GitHub Flavored Markdown</code>，支持主题和插件。其生成的是静态网页，可以直接部署在<span class="exturl" data-url="aHR0cHM6Ly9oZWxwLmdpdGh1Yi5jb20vZW4vYXJ0aWNsZXMvd2hhdC1pcy1naXRodWItcGFnZXM=">GitHub Pages<i class="fa fa-external-link-alt"></i></span>上。</p>
</div></summary>
<category term="web" scheme="https://jiruffe.com/categories/web/"/>
<category term="blog" scheme="https://jiruffe.com/tags/blog/"/>
<category term="hexo" scheme="https://jiruffe.com/tags/hexo/"/>
<category term="github" scheme="https://jiruffe.com/tags/github/"/>
</entry>
</feed>