java动态代理详解

来源：互联网发布：软件运营方案编辑：程序博客网时间：2024/06/01 03:57

代理模式示例代码：

public interface Subject   {     public void doSomething();   }   public class RealSubject implements Subject   {     public void doSomething()     {       System.out.println( "call doSomething()" );     }   }   public class ProxyHandler implements InvocationHandler   {     private Object proxied;          public ProxyHandler( Object proxied )     {       this.proxied = proxied;     }          public Object invoke( Object proxy, Method method, Object[] args ) throws Throwable     {       //在转调具体目标对象之前，可以执行一些功能处理    //转调具体目标对象的方法    return method.invoke( proxied, args);          //在转调具体目标对象之后，可以执行一些功能处理  }    }

动态代理的实现类：

import java.lang.reflect.InvocationHandler;   import java.lang.reflect.Method;   import java.lang.reflect.Proxy;   import sun.misc.ProxyGenerator;   import java.io.*;   public class DynamicProxy   {     public static void main( String args[] )     {       RealSubject real = new RealSubject();       Subject proxySubject = (Subject)Proxy.newProxyInstance(Subject.class.getClassLoader(),      new Class[]{Subject.class},      new ProxyHandler(real));             proxySubject.doSomething();       //write proxySubject class binary data to file       createProxyClassFile();     }          public static void createProxyClassFile()     {       String name = "ProxySubject";       byte[] data = ProxyGenerator.generateProxyClass( name, new Class[] { Subject.class } );       try      {         FileOutputStream out = new FileOutputStream( name + ".class" );         out.write( data );         out.close();       }       catch( Exception e )       {         e.printStackTrace();       }     }   }

0 0