1. 自定义注解实现
   

   //注解
   package com.example.test.service;
   
   import java.lang.annotation.*;
   
   @Target({ElementType.FIELD, ElementType.TYPE})
   @Retention(RetentionPolicy.RUNTIME)
   @Documented
   public @interface Info {
   
       String value() default "tracy";
   
       boolean isDelete();
   
       public enum Color{ BULE,RED,GREEN};
   
       Color fruitColor() default Color.GREEN;
   
   }

    

   
   

   //注解用于实体字段
   package com.example.test.bean;
   
   
   import com.example.test.service.Info;
   import com.fasterxml.jackson.annotation.JsonProperty;
   import lombok.Data;
   
   @Data
   @Info(isDelete = true)
   public class UserBean {
   
       @JsonProperty(value = "编号",defaultValue = "1")
       private int id;
   
       @Info(fruitColor = Info.Color.RED ,isDelete = false)
       @JsonProperty(value = "姓名",defaultValue = "")
       private String name;
   
       @Info(fruitColor = Info.Color.GREEN ,isDelete = true)
       @JsonProperty(value = "密码",defaultValue = "")
       private String password;
   }

   2、获取注解的值进行过滤

   　　 //第一种
               Class clazz = bean1.getClass();
               Info infoAnno = (Info) clazz.getAnnotation(Info.class);
               System.out.println("person.name :" + infoAnno.value() + ",person.isDelete:" + infoAnno.isDelete());
               //第二种
               System.out.println(UserBean.class.getDeclaredAnnotation(Info.class).value());

    

2. 运用场景1：

　　　　根据自定义注解的值，进行数据过滤（比如根据是否有该注解的字段进行数据导出）。

　　　3、应用场景2：

         登录拦截器是否配置注解的接口