TCP实现聊天

TCP实现聊天

客户端：

1. ​ 连接服务器 Socket
2. ​ 发送消息

服务器端：

1. ​ 建立服务器端口 ServerSocket
2. ​ 等待连接 accept
3. ​ 接收用户的消息

// TcpClientDemo01.java
package com.example.network;

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

public class TcpClientDemo01 {
    public static void main(String[] args) {
        Socket socket = null;
        OutputStream os = null;

        try {
            // 获取ip
            InetAddress serviceIp = InetAddress.getByName("localhost");
            int port = 9999;
            // 创建连接
            socket = new Socket(serviceIp, port);
            // 输出流
            os = socket.getOutputStream();
            // 向输出流里面写
            os.write("坚持学习java".getBytes());
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException 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();
                }
            }


        }

    }
}

// TcpServiceDemo01.java

package com.example.network;

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

public class TcpServiceDemo01 {
    public static void main(String[] args) {
        ServerSocket serverSocket = null;
        Socket socket = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;

        try {
            // 创建一个地址
            serverSocket = new ServerSocket(9999);

            while (true) {

                // 等待连接
                socket = serverSocket.accept();

                // 获取输入流
                is = socket.getInputStream();

                // 管道流
                baos = new ByteArrayOutputStream();

                byte[] buffer = new byte[1024];

                int len;
                while ((len = is.read(buffer)) != -1) {
                    // 写入管道流
                    baos.write(buffer, 0, len);
                }
                System.out.println(baos);

            }


        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (baos != null) {
                try {
                    baos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (is != null) {
                try {
                    is.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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