Lombok注解之@Setter_lombok.setter-优快云博客

本文链接：https://blog.youkuaiyun.com/baidu_35410857/article/details/131456298

文章介绍了Lombok的@Setter注解，用于自动为类的属性生成setter方法。它不会为static和final修饰的字段生成setter，提供了AccessLevel来指定setter的访问级别，并可以通过onMethod和onParam为生成的方法和参数添加注解。

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1.使用范围

类：为类的所有属性提供setter方法
属性：为该属性提供setter方法

2.介绍

为属性添加set方法。

注意：static、final修饰的字段不提供setter方法，因为static修饰的属性需要类名调用，而final修饰的属性不可修改

3.属性

@Target({ElementType.FIELD, ElementType.TYPE})
@Retention(RetentionPolicy.SOURCE)
public @interface Setter {
    AccessLevel value() default AccessLevel.PUBLIC;

    Setter.AnyAnnotation[] onMethod() default {};

    Setter.AnyAnnotation[] onParam() default {};

    /** @deprecated */
    @Deprecated
    @Retention(RetentionPolicy.SOURCE)
    @Target({})
    public @interface AnyAnnotation {
    }
}

value：设置生成setter方法的作用域修饰符，默认为PUBLIC修饰符
- @Setter(value = AccessLevel.PUBLIC)：public修饰
- @Setter(value = AccessLevel.PACKAGE)：默认修饰符，无
- @Setter(value = AccessLevel.PROTECTED)：protected修饰符
- @Setter(value = AccessLevel.PRIVATE)：private修饰符
- @Setter(value = AccessLevel.MODULE) ：默认修饰符，无
- @Setter(value = AccessLevel.NONE)：不生成setter方法
onMethod：用于给生成的setter方法加注解
onParam：用于给生成的setter方法参数加注解

4.实例

package org.learn.lombok;

import lombok.Setter;

@Setter
public class DemoSetter {
    private String privateVar;
    public String publicVar;
    String defaultVar;
    protected String protectedVar;
    public final String finalVar = "";
    public static String staticVar = "";
    public volatile String volatileVar = "";
    public static final String staticFinalVar = "";
}

编译后：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//

package org.learn.lombok;

public class DemoSetter {
    private String privateVar;
    public String publicVar;
    String defaultVar;
    protected String protectedVar;
    public final String finalVar = "";
    public static String staticVar = "";
    public volatile String volatileVar = "";
    public static final String staticFinalVar = "";

    public DemoSetter() {
    }

    public void setPrivateVar(String privateVar) {
        this.privateVar = privateVar;
    }

    public void setPublicVar(String publicVar) {
        this.publicVar = publicVar;
    }

    public void setDefaultVar(String defaultVar) {
        this.defaultVar = defaultVar;
    }

    public void setProtectedVar(String protectedVar) {
        this.protectedVar = protectedVar;
    }

    public void setVolatileVar(String volatileVar) {
        this.volatileVar = volatileVar;
    }
}

package org.learn.lombok;

import lombok.Setter;
import org.learn.lombok.annotation.Method;
import org.learn.lombok.annotation.Param;

public class DemoSetter {
    @Setter(onMethod_ = {@Method}, onParam_ = {@Param})
    private String name;

}

编译后：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//

package org.learn.lombok;

import org.learn.lombok.annotation.Method;
import org.learn.lombok.annotation.Param;

public class DemoSetter {
    private String name;

    public DemoSetter() {
    }

    @Method
    public void setName(@Param String name) {
        this.name = name;
    }
}