java - 如何在Java中构建时使用注释动态生成代码? [英] How to generate code dynamically with annotations at build time in Java?

问题描述

我正在寻找生成代码的解决方案.我在 SO 和一些博客上搜索过、搜索过，但没有找到好的解决方案.

I'm looking for a solution for generating code. I have googled, searched on SO and some blogs but I didn't find a good solution.

我想在我的类上放一个注解，在编译时，一些方法和属性会自动添加到类中.

I'd like to put an annotation on my class and at compilation time, some methods and properties would be automatically added to the class.

我正在寻找的解决方案的关键点:

Key points of the solution I'm looking for :

• 生成的代码可自定义(强制)
• 无需调用像 apt 这样的外部工具(强制)
• 仅 JDK，无第三方框架(强制可选)
• 可自定义注释名称(可选)

• Generated code customizable (MANDATORY)
• No external tool like apt have to be called (MANDATORY)
• JDK only, no third-party framework (MANDATORY OPTIONAL)
• Annotation name customizable (OPTIONAL)

例如:

@Aliasable
public class MyClass {
//Some properties

// Contructor ...

// Some methods
}

我的班级在编译后会是这样的:

My class would look like this after compilation :

public class MyClass {
   //Some properties
   private String alias;

   // Contructor ...

   // Some methods
   public String getAlias() {
      return alias;
   }

   public void setAlias(String alias) {
      this.alias=alias;
   }
}

最后，我把我的第三个需求从 MANDATORY 变成了 OPTIONAL 并选择了 project Lombok (与 Maven 和 Eclipse 轻松集成，几乎没有工作去做使用它).

Finally, I turned my third requirement from MANDATORY to OPTIONAL and choosed project Lombok (easy integration with Maven and Eclipse, virtually no work to do for using it).

推荐答案

看看 Project Lombok.它会在您编写时生成代码:

Have a look at Project Lombok. It generates code as you ask when you write:

public class MyClass {
  @Getter @Setter private String alias;
}

如果您需要它，它还可以做更多的事情.我知道您没有要求任何外部工具，但您基本上是在重新创建它.

It also does a lot more if you need it. I know you asked for no external tools, but you would basically be recreating this.

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