[java-代理]测试Proxy和Enhancer两种代理方式

2019-11-08 02:48:51

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区别

PRoxy是基于接口的方式进行代理，Enhancer是基于继承的方式代理。 proxy是java.lang.reflect.* enhancer是net.sf.cglib.*

测试代码:

package main;import net.sf.cglib.proxy.Enhancer;import net.sf.cglib.proxy.MethodInterceptor;import net.sf.cglib.proxy.MethodProxy;import org.apache.openjpa.conf.OpenJPAConfiguration;import org.apache.openjpa.xmlstore.ObjectData;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;public class EnhancerMainTest { public static void main(String[]args){// testEnchancer();// testProxy(); testProxy2(); } //测试 proxy public static void testProxy(){ PrintInterface printInterface = (PrintInterface) new EnhancerProxy().bind(new EnhancerDemo()); printInterface.print(); } //测试 proxy2 public static void testProxy2(){ EnhancerDemo demo = new EnhancerDemo(); PrintInterface enhancerDemo = (PrintInterface) Proxy.newProxyInstance(EnhancerDemo.class.getClassLoader(), EnhancerDemo.class.getInterfaces(), new InvocationHandler() { @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("before: "+method); //此处invoke不可以直接使用proxy 否则会陷入递归 Object result = method.invoke(demo, args); System.out.println("after: "+method); return result; } }); enhancerDemo.print(); } //测试 enchancer 代理 public static void testEnchancer(){ System.out.println("enhancer main test"); Enhancer enhancer = new Enhancer(); enhancer.setSuperclass(EnhancerDemo.class); enhancer.setUseCache(false); enhancer.setCallback(new MethodInterceptor() { @Override public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable { System.out.println("before "+method); //此处不可以使用invoke方法需使用invokeSuper否则会进入递归循环 Object result = methodProxy.invokeSuper(o,objects); System.out.println("after "+method); return result; } }); EnhancerDemo enhancerDemo = (EnhancerDemo) enhancer.create(); enhancerDemo.print(); }}//测试接口interface PrintInterface{ public void print();}//测试democlass EnhancerDemo implements PrintInterface{ public void print(){ System.out.println("print"); }}class EnhancerProxy implements InvocationHandler{ private Object target; public Object bind(Object target){ this.target = target; Object proxy = Proxy.newProxyInstance(this.target.getClass().getClassLoader(),this.target.getClass().getInterfaces(),this); return proxy; } @Override public Object invoke(Object o, Method method, Object[] objects) throws Throwable { System.out.println("before"); return method.invoke(this.target,objects); }}

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