基于TCP协议Socket通信

服务器线程处理类

package demo4;

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

/**
 * 服务器线程处理类
 * @ClassName ServerThread
 * @Author DiYun
 * @Version 1.0
 **/
public class ServerThread extends Thread {

    //和 本线程相关的Socket
    Socket socket = null;

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

    //线程执行的操作，响应客户端的请求
    public void run() {
        InputStream inputStream =null;
        InputStreamReader inputStreamReader = null;
        BufferedReader bufferedReader = null;
        OutputStream outputStream = null;
        PrintWriter printWriter = null;

        try {
            //3.获取输入流 并读取客户端信息
            inputStream = socket.getInputStream();//获取字节流
            inputStreamReader = new InputStreamReader(inputStream); //读取字节流
            bufferedReader = new BufferedReader(inputStreamReader);//为输入流添入缓冲
            String info = null;
            while ((info = bufferedReader.readLine()) != null) {
                //循环读取客户端信息
                System.out.println("我是服务器，客户端说：" + info);
            }

            //关闭输入流
            socket.shutdownInput();

            //4.获取输出流，响应客户端的请求
            outputStream = socket.getOutputStream(); //获取输出流，响应客户端的请求
            printWriter = new PrintWriter(outputStream);
            printWriter.write("欢迎您！");
            printWriter.flush();  //调用flush方法将缓冲输出

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                //5.关闭资源
                if (printWriter !=null)
                    printWriter.close();
                if(outputStream !=null)
                    outputStream.close();
                if (bufferedReader !=null)
                    bufferedReader.close();
                if(inputStreamReader !=null)
                    inputStreamReader.close();
                if(inputStream !=null)
                    inputStream.close();
                if(socket !=null)
                    socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

服务器端代码

package demo4;

import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Arrays;

/**
 * 基于TCP 协议Socket 服务端
 * @ClassName Server
 * @Author DiYun
 * @Version 1.0
 **/
public class Server {
    public static void main(String[] args) {
        try {
            //1.创建一个服务端Socket即ServerSocket  指定服务的端口并监听
            ServerSocket serverSocket = new ServerSocket(8888);
            Socket socket = null;
            //记录客户端连接的数量
            int count = 0;
            System.out.println("服务端已经启动，等待客户端连接************************");
            while (true) {
                //2.调用accept()方法开始监听，等待客户端的连接
                socket = serverSocket.accept();
                //创建一个新的线程
                ServerThread serverThread = new ServerThread(socket);
                serverThread.start();
                count++;  //统计客户端的数量
                System.out.println("客户端的数量" + count);
                InetAddress inetAddress = socket.getInetAddress();
                System.out.println("当前IP地址是：" + inetAddress.getHostAddress());
                System.out.println("客户端信息：" + Arrays.toString(inetAddress.getAddress()));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

客户端

package demo4;

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

/**
 * 基于CTP 协议的 Socket 客户端
 *
 * @ClassName Client
 * @Author DiYun
 * @Version 1.0
 **/
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("localhost", 8888);
            //2.获取输出流，向服务端发送信息
            OutputStream outputStream = socket.getOutputStream();
            //将输出流包装为打印流
            PrintWriter pw = new PrintWriter(outputStream);
            pw.write("用户名：admin 密码： 12346");
            pw.flush();
            socket.shutdownOutput();//关闭输出流

            //3.获取输出流  并读取服务端的响应信息
            InputStream inputStream = socket.getInputStream();
            //
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            String info = null;
            while ((info = bufferedReader.readLine()) != null) {
                //循环读取客户端信息
                System.out.println("我是客户端，服务端说：" + info);
            }

            //4.关闭资源
            bufferedReader.close();
            inputStream.close();

            pw.close();
            outputStream.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

注意，必须首先启动服务器再启动客户端