新手请教JAVA,SOCKET网络编程

2010-02-06 04:40:14 196 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

用Java实现基于Socket的网络编程使用Java语言，采用TCP协议，实现一对一、一对多的通信（无用户界面）阅读详情



package com.cn.socket;



import java.io.*;

import java.net.*;



public class TcpServer {

//	服务器端源程序tcpserver.Java

	/**

	 * @param args

	 */

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

		// TODO Auto-generated method stub

		ServerSocket svrsoc=null;

		Socket soc=null;

		DataInputStream in=null;

		PrintStream out=null;

		InetAddress clientIP=null;

		String str=null;

		try{

			svrsoc=new ServerSocket(8000);

			System.out.println("Server start....");

			soc=svrsoc.accept();



			in=new DataInputStream(soc.getInputStream());

			out=new PrintStream(soc.getOutputStream());

			clientIP=soc.getInetAddress();

			System.out.println("Client's IP address:"+clientIP);

			out.println("welcome.....");

			str=in.readLine();

			while (!str.equals("quit")){

			System.out.println("Client said:"+str);

			str=in.readLine();

			}

			System.out.println("Client want to leave");

			}

		catch(Exception e){

			System.out.println("error:"+e);

			}

		finally{

			in.close();

			out.close();

			soc.close();

			svrsoc.close();

			System.exit(0);

			}

	}



}

以上是服务端代码



package com.cn.socket;



import java.io.*;

import java.net.*;



public class TcpClient {

//	客户端源程序tcpclient.java

	/**

	 * @param args

	 */

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

		// TODO Auto-generated method stub

		Socket soc=null;

		DataInputStream in=null;

		PrintStream out=null;

		DataInputStream sysin=null;

		String strin=null;

		String strout=null;

		try{

			soc=new Socket(args[0],8000);

			System.out.println("Connecting to the Server");

			in=new DataInputStream(soc.getInputStream());

			out=new PrintStream(soc.getOutputStream());

			strin=in.readLine();

			System.out.println("Server said:"+strin);

			sysin=new DataInputStream(System.in);

			strout=sysin.readLine();

			while (!strout.equals("quit")){

				out.println(strout);

				strout=sysin.readLine();

			}

			out.println(strout);

		}

		catch(Exception e){

			System.out.println("error:"+e);

		}

		finally{

			in.close();

			out.close();

			soc.close();

			sysin.close();

			System.exit(0);

		}

	}



}

以上是客户端代码，我把服务端，客户端的代码都放到一个包里，
然后我在本机上运行它们，我先运行服务端，有运行程序，然后
运行客户端代码，并且给了相应的IP地址(我是用Eclipse工具)，结果客户端，
服务端都报错，错误如下：
error:java.net.BindException: Address already in use: JVM_Bind
Exception in thread "main" java.lang.NullPointerException
at com.cn.socket.TcpServer.main(TcpServer.java:40)
请问我该怎么运行这个程序。

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