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Cglib代理简单案例

news 2025/6/26 13:10:36

Cglib代理简单案例

前言：
1，实现对目标类的增强
2，源码后期补齐

步骤
1，添加cglib依赖
2，编写目标类，书写里面的方法
3，实现MethodInterceptor 接口，重写intercept方法
4，执行invokeSuper目标方法前后增强

1，

        <dependency><groupId>cglib</groupId><artifactId>cglib</artifactId><version>3.3.0</version></dependency>

2，编写目标类，书写里面的方法

package service.Impl;/*** 定义普通类*/
public class PersonSayLanguageService {public void sayLanguage(String languageType){System.out.println("say，" + languageType);}}

3，实现MethodInterceptor 接口，重写intercept方法

package cglib;import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;import java.lang.reflect.Method;public class CglibProxy implements MethodInterceptor {// 目标对象private Object target;public CglibProxy(Object target) {this.target = target;}@Overridepublic Object intercept(Object target, Method method, Object[] objects, MethodProxy proxy) throws Throwable {// 在方法调用前进行一些处理System.out.println("Before invoking method：" + method.getName());Object result = proxy.invokeSuper(target, objects);System.out.println("After invoking method：" + method.getName());return result;}
}

4，执行invokeSuper目标方法前后增强

package test;import cglib.CglibProxy;
import net.sf.cglib.proxy.Enhancer;
import service.Impl.PersonSayLanguageService;public class CGLIBProxyExample {public static void main(String[] args) {// 1.创建目标对象PersonSayLanguageService languageService = new PersonSayLanguageService();// 2.创建CGlib代理 enhance对象Enhancer enhancer = new Enhancer();enhancer.setSuperclass(PersonSayLanguageService.class);enhancer.setCallback(new CglibProxy(languageService));// 3.创建代理对象PersonSayLanguageService proxy = (PersonSayLanguageService) enhancer.create();proxy.sayLanguage("中国话");}
}