spring注解 动态修改注解的值

package com.kafka.consume;

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.annotation.KafkaListener;

import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Map;

interface A {
    String func1();
}
class B implements A {

    @Override
    public String func1() {
        return "f1";
         }
        public String func2(){
        return "f2";
        }
    }
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
 @interface Foo {
    String value();
}
class Bar {
    @Foo("fff")
    private String val;

    @KafkaListener(groupId = "demo", topics = "demo")
    public void listenerDemo(ConsumerRecord<?, ?> record) throws Exception{
        System.out.println("--"+record.value());
    }
}
    public class Main {
    public static void main(String ...args) throws NoSuchFieldException, IllegalAccessException, NoSuchMethodException {
        Bar bar = new Bar();
        Field field = Bar.class.getDeclaredField("val");
        Foo foo = field.getAnnotation(Foo.class);
        InvocationHandler h = Proxy.getInvocationHandler(foo);
        Field hField = h.getClass().getDeclaredField("memberValues");
        hField.setAccessible(true);
        Map memberValues = (Map) hField.get(h);
        memberValues.put("value", "ddd");
        String value = foo.value();
        System.out.println(value); // ddd
        ///////
        Bar bar1 = new Bar();
        Method[] method = Bar.class.getDeclaredMethods();
        KafkaListener listener = method[0].getAnnotation(KafkaListener.class);
        InvocationHandler hh = Proxy.getInvocationHandler(listener);
        Field hFields = h.getClass().getDeclaredField("memberValues");
        hFields.setAccessible(true);
        Map memberValuess = (Map) hFields.get(hh);
        memberValuess.put("groupId", "mayunzhenGroup");
        System.out.println(listener.groupId());
    }
}

spring注解 动态修改注解的值

原文：https://www.cnblogs.com/yunger/p/15018650.html