【网络编程】TCP实现聊天

TCP实现聊天

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原理

客户端：
        1. 连接服务器Socket
        2.发送消息
服务器：
        1. 建立服务器的端口ServerSocket
        2. 等待客户端的连接accept
        3. 接受客户端的消息

客户端代码

package com.tx.socket.tcp;

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

/**
 * @Auther lmy
 * @Date 2021/5/14 2:28
 * @Description 客户端
 */
public class TcpClientDemo01 {
    public static void main(String[] args) {
        Socket socket = null;
        OutputStream os = null;

        try {
            //1.要知道服务器的地址，端口号
            InetAddress serverIP = InetAddress.getByName("127.0.0.1");
            int port = 9999;
            //2.创建一个socket连接
            socket = new Socket(serverIP, port);
            System.out.println("客户端启动了...");
            //3.发送消息  io流
            os = socket.getOutputStream();
            os.write("你好，服务器".getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

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服务器代码

package com.tx.socket.tcp;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * @Auther lmy
 * @Date 2021/5/14 2:28
 * @Description 服务端
 */
public class TcpServerDemo01 {
    public static void main(String[] args) {
        ServerSocket serverSocket = null;
        Socket socket = null;
        InputStream in = null;
        ByteArrayOutputStream baos = null;

        try {
            //1.服务器得有一个地址
            serverSocket = new ServerSocket(9999);
            System.out.println("服务器启动了...");
            //2.等待客户端连接过来
            while (true) {
                socket = serverSocket.accept();
                //读取客户端的消息
                in = socket.getInputStream();


                //管道流
                baos = new ByteArrayOutputStream();
                byte[] bytes = new byte[1024];
                int len;
                while ((len = in.read(bytes)) != -1) {
                    baos.write(bytes, 0, len);
                }

                System.out.println(baos.toString());

            }

            /*
            //会出现中文乱码
            byte[] bytes = new byte[1024];
            int len;
            while ((len = in.read(bytes)) != -1) {
                String msg = new String(bytes, 0, len);
                System.out.println(msg);
            }
            */

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (baos != null) {
                try {
                    baos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (serverSocket != null) {
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

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测试

1.先启动服务器进行监听

2.启动客户端，给服务器发送消息

3.服务器接受到消息

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