二、多线程实现简单的socket通信实例（TCP）

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1.服务器端

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * 类功能描述：先启动服务器端，再启动客户端
 *
 * @author：***
 * @createTime：2018/11/5 16:02
 */
public class Server {

    public static void main(String[] args) {
        try {
            //1.创建服务器socket  指定监听端口
            ServerSocket serverSocket = new ServerSocket(18080);
            //2.调用accept()开始监听，等待客户的连接
            System.out.println("---------服务器即将启动，等待客户端连接---------");
            int count = 1;
            //3.循环监听等待客户端的连接
            while (true) {
                Socket socket = serverSocket.accept();
                ServerThread serverThread = new ServerThread(socket);
                serverThread.start();
                System.out.println("客户端连接数：" + count++);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

2.线程类

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

/**
 * 类功能描述：服务器线程处理类
 *
 * @author：***
 * @createTime：2018/11/7 9:15
 */
public class ServerThread extends Thread {
    private Socket socket;


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

    @Override
    public void run() {
        BufferedReader br = null;
        PrintWriter pw = null;
        try {
            //3.读取客户端发送信息
            br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            System.out.println("接收到客户端发送的消息为：" + br.readLine());
            socket.shutdownInput();
            //4.推送客户端请求
            pw = new PrintWriter(socket.getOutputStream());
            pw.write("response");
            pw.flush();
            socket.shutdownOutput();
            //5.关闭连接
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
                if (pw != null) {
                    pw.close();
                }
                if (socket != null) {
                    socket.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

    }
}

3.客户端类

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

/**
 * 类功能描述：客户端，启动多个客户端
 *
 * @author：***
 * @createTime：2018/11/5 16:03
 */
public class Client {

    public static void main(String[] args) {
        try {
            //1.创建客户端socket，指定服务器地址和端口
            Socket socket = new Socket("127.0.0.1", 18080);
            //2.向服务器发送信息
            PrintWriter pw = new PrintWriter(socket.getOutputStream());
            pw.write("request");
            pw.flush();
            socket.shutdownOutput();
            //3.读取服务器推送信息
            BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            System.out.println("接收到服务器推送的消息为：" + br.readLine());
            socket.shutdownInput();
            //4.关闭连接
            br.close();
            pw.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}