Spring Boot JTE

A Java Template Engine is a tool that allows developers to generate HTML, XML or other text-based formats using templates. These templates are typically written in a mix of static text and dynamic placeholders, which are replaced with actual data at runtime. Here are some key points about Java Template Engines:

1. Separation of Concerns: They help in separating the presentation layer from the business logic, making the code more maintainable and easier to understand.

2. Dynamic Content: They allow the creation of dynamic web pages by embedding variables and control structures (like loops and conditionals) within the templates.

3. Popular Java Template Engines:

   • Thymeleaf: A modern server-side Java template engine for web and standalone environments.
   • Freemarker: A Java-based template engine focused on MVC frameworks.
   • Velocity: An older template engine that is still in use for various applications.
   • JTE: A compile-time checked template engine that ensures type safety and fast rendering.

4. Integration with Frameworks: Most Java template engines integrate seamlessly with popular Java web frameworks like Spring Boot, making it easy to use them in web applications.

5. Template Syntax: Each template engine has its own syntax for defining templates. For example, JTE uses @ for directives and ${} for variable interpolation.

6. Performance: Some template engines, like JTE, focus on performance by compiling templates to Java code, which can be faster than interpreting templates at runtime.

Here is an example of how a template engine might be used in a Spring Boot application:

@Controller
public class ExampleController {
   @GetMapping("/example")
   public String example(Model model) {
      model.addAttribute("message", "Hello, World!");
      return "exampleTemplate";
   }
}

And the corresponding template (exampleTemplate.jte for JTE):

@template.layout.main(content = @`
    <div>
        <p>${message}</p>
    </div>
`)

In this example, the TemplateController adds a message to the model, which is then rendered in the exampleTemplate.jte template. The placeholder ${message} is replaced with the actual message at runtime.

Things todo list

1. Clone this repository: git clone https://github.com/hendisantika/spring-boot-jte1.git
2. Navigate to the folder: cd spring-boot-jte1
3. Run the application: mvn clean spring-boot:run
4. Open your favorite browser: http://localhost:8080/

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