使用Socket编写一个服务端与客户端的聊天程序

服务端

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

//服务器端代码
//监听端口，每成功连接一个客户机就开启一个线程进行读写处理
public class Server {

    public static void main(String[] args) throws Exception {
        ServerSocket ss = new ServerSocket(65000);
        while (true) {
            Socket socket = ss.accept();
            new MyThread(socket).start(); //开启一个线程用于处理已连接上的socket
        }
    }
}
//开启两个线程分别用来处理socket中的输入输出流
class MyThread extends Thread {
    private Socket socket;

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

    @Override
    public void run() {
        try {
            //开启两个线程分别来处理服务端的读写
            new OutputThread(socket.getOutputStream()).start();
            new InputThread(socket.getInputStream()).start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

//处理socket的输出流
class OutputThread extends Thread {
    private OutputStream os;
    public OutputThread(OutputStream os) {
        this.os = os;
    }

    @Override
    public void run() {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = null;
        try {
            while ((line = br.readLine()) != null) {
                os.write((line).getBytes());
                os.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

//处理socket的输入流
class InputThread extends Thread {
    private InputStream is;
    public InputThread(InputStream is) {
        this.is = is;
    }
    @Override
    public void run() {
        int ch = 0;
        byte[] buff = new byte[1024];
        try {
            while ((ch = is.read(buff)) != -1) {
                String content = new String(buff, 0, ch);
                System.out.println(content);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

客户端

import java.net.Socket;

//客户端代码
public class Client {

    public static void main(String[] args) throws Exception {
        Socket socket = new Socket("127.0.0.1", 65000);
        new MyThread(socket).start(); //开启一个线程用于处理已连接上的socket
    }
}

实现效果

两个main方法都启动后，会有两个控制台：
server发送“hello”给client，按回车

client发送“socket”给server