查看Proxy产生的代理对象

package com.demo;


import java.io.FileOutputStream;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;


import sun.misc.ProxyGenerator;


public class DynamicProxyTest {
public static void writeProxyClassToHardDisk(String path) throws Exception {
// 第一种方法，这种方式在刚才分析ProxyGenerator时已经知道了
// System.getProperties().put("sun.misc.ProxyGenerator.saveGeneratedFiles", true);
// 第二种方法
// 获取代理类的字节码
byte[] classFile = ProxyGenerator.generateProxyClass("$Proxy11", IAImpl.class.getInterfaces());
FileOutputStream out = new FileOutputStream(path);
out.write(classFile);
out.flush();
out.close();
}


public static void main(String[] args) throws Exception {

               //注意再用jd-gui.exe 工具反编译字节码文件，可以看到源文件
writeProxyClassToHardDisk("E:\\workspace2\\jucdemo\\Proxy11.class");
/*
* // 添加以下的几段代码, 就可以将代理生成的字节码保存起来了 Field field =
* System.class.getDeclaredField("props"); field.setAccessible(true);
* Properties props = (Properties) field.get(null);
* props.put("sun.misc.ProxyGenerator.saveGeneratedFiles", "true");
* 
* Package pkg = ProxyTest2.class.getPackage(); if (pkg != null) {
* String packagePath = pkg.getName().replace(".", File.pathSeparator);
* new File(packagePath).mkdirs(); }
* 
* IA a = new IAImpl(); InvocationHandlerImpl ih = new
* InvocationHandlerImpl(a); IA proxyA = (IA)
* Proxy.newProxyInstance(a.getClass().getClassLoader(),a.getClass().
* getInterfaces(), ih);
* 
* proxyA.a();
*/
}
}


interface IA {
void a();


int b(String str);
}


class IAImpl implements IA {


@Override
public void a() {
System.out.println("IAImpl.a()");
}


@Override
public int b(String str) {
System.out.println("IAImpl.b()");
return 0;
}
}


class InvocationHandlerImpl implements InvocationHandler {


private Object target;


public InvocationHandlerImpl(Object target) {
this.target = target;
}


public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
System.out.println("before...");
Object res = method.invoke(target, args);
System.out.println("after...");
return res;
}
}