JAVA SOCKET 通信

1.服务端

package com.pgis.socket;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Scanner;

public class MyServer {
    public static final int MY_SERVER_PORT = 54321;
    public static final Charset MY_COMM_CHARSET = StandardCharsets.UTF_8;
    public static final String BYE = "BYE";

    public static void main(String[] args) {
        commWithClient();
    }

    private static void commWithClient() {
        try (
            ServerSocket ss = new ServerSocket(MY_SERVER_PORT);
            Socket s = ss.accept();
        ){
            MyChating myChating =new MyChating("客户端","你好，你已经连接上服务端了",s);
            myChating.chatting();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

2.客户端

package com.pgis.socket;

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

import static com.pgis.socket.MyServer.MY_SERVER_PORT;

public class MyClient {
    public static void main(String[] args) {
        commWithServer();
    }

    private static void commWithServer() {
        try (
            Socket s = new Socket("localhost",MY_SERVER_PORT);
        ) {
            MyChating myChating =new MyChating("服务端",null,s);
            myChating.chatting();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

3.聊天通信类

package com.pgis.socket;

import java.io.*;
import java.net.Socket;
import java.util.Scanner;
import static com.pgis.socket.MyServer.*;

public class MyChating {
    private String from;
    private String greeting;
    private Socket s;

    public MyChating(String from, String greeting, Socket s) {
        this.from = from;
        this.greeting = greeting;
        this.s = s;
    }

    public void chatting(){
        Scanner in = new Scanner(System.in);
        try (
                BufferedReader br = new BufferedReader(
                        new InputStreamReader(s.getInputStream(), MY_COMM_CHARSET)
                );
                PrintWriter pw = new PrintWriter(
                        new OutputStreamWriter(s.getOutputStream(), MY_COMM_CHARSET)
                );
        ) {
            if(greeting != null){
                pw.println("客户端你好！我们连接上了！");
                pw.flush();
            }
            while (true){
                String line = br.readLine();
                if (line.equalsIgnoreCase(BYE)){
                    pw.println(BYE);
                    break;
                }else {
                    System.out.println(from+line);
                    String myword = in.nextLine();
                    pw.println(myword);
                    pw.flush();
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}