ServerSocket和Socket

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

public class HttpServer{
    
    public static void main(String[] args){
        new HttpServer().start();
    }
    
    private ServerSocket serversocket=null;
    
    public HttpServer(){
        try{
            serversocket=new ServerSocket(5000);//监听客户端端口5000的socket请求
            System.out.println("服务器启动");
        }catch(IOException e){
            e.printStackTrace();
        }
    }

    public void start(){
        Socket socket=null;
        while(true){
            try{

                socket=serversocket.accept(); //接受客户端请求socket
                System.out.println("address:"+socket.getInetAddress()+":"+socket.getLocalPort());

                
                OutputStream os =socket.getOutputStream();
                BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os));
                //向客户端发送一条消息
                bw.write("测试服务器通信\n");
                bw.flush();

            }catch(IOException e){
                e.printStackTrace();
                System.out.println("连接断开");
            }finally{
                try{
                    if(socket !=null){
                        socket.close();
                    }
                }catch(IOException e){
                    
                }
            }
        }
    }
}

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

public class Client{
    
    public static void main(String[] args){
        Socket socket=null;
        try{
            socket =new Socket("127.0.0.1",5000);
            
            
            InputStream is =socket.getInputStream();
            InputStreamReader isr=new InputStreamReader(is);
            BufferedReader br =new BufferedReader (isr);
            String mess=br.readLine();
            
            System.out.println("mess:"+mess);
        }catch(IOException e){
            e.printStackTrace();
        }finally{
            try{
                if(socket !=null){
                    socket.close();
                }
            }catch(IOException e){
                
            }
        }
        
    }
    
}