TCP实现聊天

客户端

1.连接服务器Socket
2.发送消息

package com.guo.lesson02;

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

//客户端
public class TcpClientDemo01 {
    public static void main(String[] args) {

        Socket socket = null;
        OutputStream os = null;

        //1.要知道服务器的地址,端口号
        try {
            InetAddress serverip = InetAddress.getByName("127.0.0.1");
            int port = 9999;
            //2.创建一个socket连接
            socket = new Socket(serverip,port);
            //3.发送消息 IO流
            
            os = socket.getOutputStream();
            os.write("你好，加油学习".getBytes());

        } catch (Exception e) {
            throw new RuntimeException(e);
        }finally {
            if (os!=null){
                try {
                    os.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            if (socket!=null){
                try {
                    socket.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
}

服务端

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

package com.guo.lesson02;

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

//服务端
public class TcpServerDemo01 {
    public static void main(String[] args) {
        ServerSocket serverSocket = null;
        Socket socket = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        //1.我得有一个地址
        try {
            serverSocket = new ServerSocket(9999);

            while (true){
                //2.等待客户端连接过来
                socket = serverSocket.accept();
                //3.读取客户端消息
                is = socket.getInputStream();


                //管道流
                baos = new ByteArrayOutputStream();
                byte[] buffer = new byte[1024];
                int len;
                while ((len=is.read(buffer))!=-1){
                    baos.write(buffer,0,len);
                }
                System.out.println(baos.toString());
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            //关闭资源
            if (baos!=null){
                try {
                    baos.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            if (is!=null){
                try {
                    is.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            if (socket!=null){
                try {
                    socket.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            if (serverSocket!=null){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
}