tcp线程聊天

.ServerThread
package serverclient;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class ServerThread extends Thread {

    Socket socket = null; //保存与本线程相关的Socket对象  

    int clientnum; //保存本进程的客户计数  

    public ServerThread(Socket socket, int num) { //构造函数
        this.socket = socket; //初始化socket变量
        clientnum = num + ; //初始化clientnum变量
    }

    public void run() { //线程主体
        try {
            String line;
            BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//由Socket对象得到输入流，并构造相应的BufferedReader对象
            PrintWriter os = new PrintWriter(socket.getOutputStream());
//由Socket对象得到输出流，并构造PrintWriter对象
            BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
//由系统标准输入设备构造BufferedReader对象
            System.out.println("Client:" + clientnum + is.readLine());
//在标准输出上打印从客户端读入的字符串
            line = sin.readLine();
//从标准输入读入一字符串
            while (!line.equals("bye")) {
//如果该字符串为 "bye"，则停止循环
                os.println(line);
//向客户端输出该字符串
                os.flush();
//刷新输出流，使Client马上收到该字符串
                System.out.println("Server:" + line);
//在系统标准输出上打印该字符串
                System.out.println("Client:" + clientnum + is.readLine());
//从Client读入一字符串，并打印到标准输出上
                line = sin.readLine();
//从系统标准输入读入一字符串
            } //继续循环
            os.close(); //关闭Socket输出流
            is.close(); //关闭Socket输入流
            socket.close(); //关闭Socket
        } catch (Exception e) {
            System.out.println("Error:" + e);
//出错，打印出错信息
        }
    }
}  

.MultiTalkClient
/**
 * Created by hoobey on 2017/9/13.
 */
package serverclient;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class MultiTalkClient {

    public static void main(String args[]) {
        try {
            Socket socket = new Socket("127.0.0.1", );
//向本机的4700端口发出客户请求
            BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
//由系统标准输入设备构造BufferedReader对象
            PrintWriter os = new PrintWriter(socket.getOutputStream());
//由Socket对象得到输出流，并构造PrintWriter对象
            BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//由Socket对象得到输入流，并构造相应的BufferedReader对象
            String readline;
            readline = sin.readLine(); //从系统标准输入读入一字符串
            while (!readline.equals("bye")) {
//若从标准输入读入的字符串为 "bye"则停止循环
                os.println(readline);
//将从系统标准输入读入的字符串输出到Server
                os.flush();
//刷新输出流，使Server马上收到该字符串
                System.out.println("Client:" + readline);
//在系统标准输出上打印读入的字符串
                System.out.println("Server:" + is.readLine());
//从Server读入一字符串，并打印到标准输出上
                readline = sin.readLine();
//从系统标准输入读入一字符串
            } //继续循环
            os.close(); //关闭Socket输出流
            is.close(); //关闭Socket输入流
            socket.close(); //关闭Socket
        } catch (Exception e) {
            System.out.println("Error" + e); //出错，则打印出错信息
        }
    }
}

.MultiTalkServer
package serverclient;

import java.io.*;
import java.net.*;

public class MultiTalkServer {

    static int clientnum = ; // 静态成员变量，记录当前客户的个数

    public static void main(String args[]) throws IOException {
        ServerSocket serverSocket = null;
        boolean listening = true;
        try {
            serverSocket = new ServerSocket();
            // 创建一个ServerSocket在端口4700监听客户请求
        } catch (IOException e) {
            System.out.println("Could not listen on port:4700.");
            // 出错，打印出错信息
            System.exit(-); // 退出
        }
        while (listening) { // 永远循环监听
            new ServerThread(serverSocket.accept(), clientnum).start();
            // 监听到客户请求，根据得到的Socket对象和
            // 客户计数创建服务线程，并启动之
            clientnum++; // 增加客户计数
        }
        serverSocket.close(); // 关闭ServerSocket
    }
}