Java动态代理之cglib

cglib是对jdk动态代理的补充，弥补了因没有接口的类生成代理类的缺失。
下面通过简单的例子学习一下cglib的使用，当然，要是用需要第三方的jar包，jar包自行下载。

业务类

public class BankService {    public void save(){        System.out.println("存钱...");    }}

业务增强类

public class ServiceEnhancer {    public static void before(){        System.out.println("检查钱是否完整无存");    }    public static void after(){        System.out.println("如果有错，就回滚");    }}

import java.lang.reflect.Method;import net.sf.cglib.proxy.Enhancer;import net.sf.cglib.proxy.MethodInterceptor;import net.sf.cglib.proxy.MethodProxy;public class CglibProxy implements MethodInterceptor{    private Enhancer enhancer = new Enhancer();    public Object getProxy(Class<?> clazz){        //设置 需要创建子类的类        enhancer.setSuperclass(clazz);        enhancer.setCallback(this);        return enhancer.create();//通过字节码技术创建子类实例    }    @Override    public Object intercept(Object obj, //目标类实例            Method method, //目标类方法的反射对象            Object[] args, //方法的动态入参            MethodProxy proxy //代理类实例            ) throws Throwable {        ServiceEnhancer.before();        Object result = proxy.invokeSuper(obj, args);        ServiceEnhancer.after();        return result;    }}

public class CglibDemo {    public static void main(String[] args) {        CglibProxy proxy = new CglibProxy();        BankService bankservice = (BankService) proxy.getProxy(BankService.class);        bankservice.save();        //com.proxy.cglib.BankService$$EnhancerByCGLIB$$82923c9a@2e5d6d97        //System.out.println(bankservice);    }}