在远程方法调用中运用 《代理类2》

// SimpleClient.java

package proxy1;

import java.io.*;

import java.net.*;

import java.util.*;

public class SimpleClient {

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

     //创建静态代理类实例

    HelloService helloService1=new HelloServiceProxy("localhost",8000);

    System.out.println(helloService1.echo("hello"));

    System.out.println(helloService1.getTime());

    //创建动态代理类实例

    HelloService helloService2=

         (HelloService)ProxyFactory.getProxy(HelloService.class,"localhost",8000);

    System.out.println(helloService2.echo("hello"));

    System.out.println(helloService2.getTime());

  }

}

 SimpleServer.java

package proxy1;

import java.io.*;

import java.net.*;

import java.util.*;

import java.lang.reflect.*;

public class SimpleServer {

  private Map remoteObjects=new HashMap();

  

  public void register(String className,Object remoteObject){

    remoteObjects.put( className,remoteObject);

  } 

  public void service()throws Exception{

    ServerSocket serverSocket = new ServerSocket(8000);

    System.out.println("服务器启动.");

    while(true){

      Socket socket=serverSocket.accept();

      InputStream in=socket.getInputStream();

      ObjectInputStream ois=new ObjectInputStream(in);

      OutputStream out=socket.getOutputStream();

      ObjectOutputStream oos=new ObjectOutputStream(out);

      Call call=(Call)ois.readObject();

      System.out.println(call);

      call=invoke(call);

      oos.writeObject(call);

      

      ois.close();

      oos.close();

      socket.close();

    }

  }

  public Call invoke(Call call){

    Object result=null;

    try{

      String className=call.getClassName();

      String methodName=call.getMethodName();

      Object[] params=call.getParams();

      Class classType=Class.forName(className); 

      Class[] paramTypes=call.getParamTypes();

      Method method=classType.getMethod(methodName,paramTypes);  

      Object remoteObject=remoteObjects.get(className);

      if(remoteObject==null){

        throw new Exception(className+"的远程对象不存在");

      }else{

        result=method.invoke(remoteObject,params);

      }

    }catch(Exception e){result=e;}

    call.setResult(result);

    return call;

  }

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

    SimpleServer server=new SimpleServer();

    server.register("proxy1.HelloService",new HelloServiceImpl());

    server.service();

  }

}