一个服务器多客户端

按照java开发技术大全（刘新-清华出版社）的指导，今天尝试了一下java的网络作用

一下代码采用 的是tcp/ip连接方式，代码不是很难

服务器端代码：

 

 package com.mutouyihao;

 import java.net.ServerSocket;
 import java.net.Socket;

 //server文件

 public class server
 {

    public static void main(String[] args){
       try{
        System.out.println("等待连接");
        ServerSocket sk = new ServerSocket(4000);
        Socket connectToClient = null;
        while(true){
           connectToClient=sk.accept();
           System.out.println(connectToClient.getInetAddress()+"建立连接");
           new ServerThread(connectToClient);
        }
       }catch (Exception e)
       {
          e.printStackTrace();
       }
    }
  }

 

 package com.mutouyihao;

 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
 import java.net.Socket;
 //供server调用
 public class ServerThread extends Thread
 {
    private Socket connectToClient;

    private DataInputStream inFromClient;

    private DataOutputStream outToClient;


    public ServerThread(Socket soc) throws IOException
    {
       super();
       connectToClient = soc;
       inFromClient = new DataInputStream(connectToClient.getInputStream());
       outToClient = new DataOutputStream(connectToClient.getOutputStream());
       start();
    }

    public void run()
    {
       try
       {
          String str;

          boolean goon = true;
          while (goon)
          {
             str = inFromClient.readUTF();
             if ( !str.equals("bye") )
             {

                str = "return string" + str;
                outToClient.writeUTF(str);
                outToClient.flush();
             }
             else
             {
                goon = false;
                outToClient.writeUTF("bye");
                outToClient.flush();
             }
          }
          inFromClient.close();
          outToClient.close();
          connectToClient.close();

       }
       catch (Exception e)
       {
          e.printStackTrace();
       }
    }
 }

 

client代码

 package com.mutouyihao;

 import java.io.BufferedReader;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.InputStreamReader;
 import java.net.Socket;

 public class Client
 {
    public static void main(String[] args)
    {
       try
       {
          Socket connectionToServer = new Socket("localhost", 4000);
          DataInputStream inFromServer = new DataInputStream(connectionToServer.getInputStream());
          DataOutputStream outToServer = new DataOutputStream(connectionToServer.getOutputStream());
          System.out.println("input your number now:");
          String outStr, inStr;
          boolean goon = true;
          BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
          while (goon)
          {
             outStr = buf.readLine();
             outToServer.writeUTF(outStr);
             outToServer.flush();
             inStr = inFromServer.readUTF();
             if ( !inStr.equals("bye") )
                System.out.println("the returned data is:"+inStr);
             else
                goon = false;
          }
          inFromServer.close();
          outToServer.close();
          connectionToServer.close();
       }
       catch (Exception e)
       {
          e.printStackTrace();
       }
    }

 }