java多线程实现多客户端socket通信

一、服务端

package com.czhappy.hello.socket;

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) {
        //创建ServerSocket示例，指定端口，侦听
        try {
            ServerSocket serverSocket = new ServerSocket(8888);
            System.out.println("服务即将启动，等待客户端连接");
            //记录客户端的数量
            int count = 0;
            Socket socket = null;
            while(true){
                //开始监听，等待客户端的连接
                socket = serverSocket.accept();
                ServerThread serverThread = new ServerThread(socket);
                serverThread.setPriority(4);//设置线程的优先级，范围是：[1,10]，默认为5
                serverThread.start();
                count++;
                System.out.println("客户端的数量="+count);
                InetAddress address = socket.getInetAddress();
                System.out.println("当前客户端的IP地址为："+address.getHostAddress());
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

package com.czhappy.hello.socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.Socket;

/**
 * 服务器线程处理类
 * @author Administrator
 *
 */
public class ServerThread extends Thread{

    Socket socket = null;

    public ServerThread(Socket socket){
        this.socket = socket;
    }

    public void run() {
        InputStream is = null;
        InputStreamReader isr = null;
        BufferedReader br = null;
        OutputStream os = null;
        PrintWriter pw = null;
        try {
            //获取字节输入流
            is = socket.getInputStream();
            //将字节输入流转化为字符输入流
            isr = new InputStreamReader(is, "utf-8");
            //为字符输入流添加缓冲
            br = new BufferedReader(isr);
            String data = br.readLine();
            while(data!=null){
                System.out.println("我是服务器，客户端说："+data);
                data = br.readLine();
            }
            //关闭输入流
            socket.shutdownInput();
            //获取输出流，响应客户端请求
            os = socket.getOutputStream();
            pw = new PrintWriter(os);
            pw.write("欢迎您！");
            pw.flush();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                if(pw!=null){
                    pw.close();
                }
                if(os!=null){
                    os.close();
                }
                if(br!=null){
                    br.close();
                }
                if(isr!=null){
                    isr.close();
                }
                if(is!=null){
                    is.close();
                }
                if(socket!=null){
                    socket.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

}

二、客户端

package com.czhappy.hello.socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client {

    public static void main(String[] args) {
        try {
            //创建客户端Socket，指定服务器地址和端口
            Socket socket = new Socket("192.168.0.45", 8888);
            //获取输出流，向服务器发送消息
            OutputStream os = socket.getOutputStream();//字节输出流
            PrintWriter pw = new PrintWriter(os);//将输出流包装成打印流
            pw.write("用户名:admin;密码:123");
            pw.flush();
            socket.shutdownOutput();//关闭输出流
            //获取输入流，读取服务器端响应信息
            InputStream is = socket.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String data = br.readLine();
            while(data!=null){
                System.out.println("我是客户端，服务器说："+data);
                data = br.readLine();
            }

            br.close();
            is.close();
            pw.close();
            os.close();
            socket.close();
        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

三、测试结果

需要先启动服务端，再启动客户端

服务端运行结果：

客户端运行结果：