新手请教JAVA,SOCKET网络编程

[hz03zhuhaowen]

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。

[humanity]

它说端口正在使用，你用 serverSocket.setReuseAddress(true) 看行不行。

[teemai]

换个别的端口再试试吧