Java ServerSocket & Socket 实现 单组【客户端⇄服务端】双工通信（双向通信）

Server.java  /**服务器端开启服务**/
package com.example.socket.service;

import lombok.SneakyThrows;

import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class Server{
    private static List<Socket> sockets = new ArrayList<>();
    private static SST sst;
    private static SRT srt;
    @SneakyThrows
    public static void main(String[] args){
        ServerSocket ss = new ServerSocket(8080);
        System.out.println("**********聊天室服务器开启成功，等待用户连接************");
        while (true) {
            Socket socket = ss.accept();
            sockets.add(socket);

                System.out.println("*****\t用户\t" + socket.getPort()  + "\t连接成功\t******");

                sst = new SST("服务器：", socket);
                sst.start();
                srt = new SRT("服务器：", socket);
                srt.start();

            }
        }

    }

Client.java  /**客户端开启服务**/
package com.example.socket.service;

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

public class Client {

    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1", 8080);
        CST cst = new CST("客户\t"+socket.getLocalPort()+"\t发消息线程：",socket);
        CRT crt = new CRT("客户\t"+socket.getLocalPort()+"\t收消息线程：",socket);
        crt.start();
        cst.start();
    }
}

SST.java  /**服务器端发送消息实现**/
package com.example.socket.service;

import lombok.SneakyThrows;

import java.io.*;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.Queue;
import java.util.Scanner;
import java.util.concurrent.LinkedBlockingQueue;

public class SST extends Thread{
    private String threadName;
    private Thread thread;
    private Socket socket;
    private static List<Socket> sockets = new ArrayList<>();
    private static Scanner scanner = new Scanner(System.in);
    private OutputStream outputStream = null;
    private OutputStreamWriter outputStreamWriter = null;
    private BufferedWriter bufferedWriter = null;
    private Queue<String> queue = new LinkedBlockingQueue();
    SST(String tn , Socket st){
        this.threadName = tn;
        this.socket = st;
        this.sockets.add(socket);
    }

    @SneakyThrows
    @Override
    public void run(){

        // 当只有一个socket时，无需判断与谁进行聊天
            outputStream = socket.getOutputStream();
            outputStreamWriter = new OutputStreamWriter(outputStream);
            bufferedWriter = new BufferedWriter(outputStreamWriter);

            while(true){

                if(scanner.hasNext()){
                    queue.add(scanner.next());
                }

                for (String s : queue ) {
                    bufferedWriter.write("\t" + s +"\n");
                    bufferedWriter.flush();
                }
                queue.clear();
            }
        }

    @Override
    public void start(){
        if(null==thread){
            thread = new Thread(this,this.threadName);
            thread.start();
        }
    }


}

SRT.java  /**服务器端接收消息实现**/
package com.example.socket.service;

import lombok.SneakyThrows;
import java.io.*;
import java.net.Socket;

public class SRT extends Thread{
    private String threadName;
    private Thread thread;
    private Socket socket;

    SRT(String tn , Socket st){
        this.threadName = tn;
        this.socket = st;
    }

    @SneakyThrows
    @Override
    public void run(){
        if(null!=socket){
            InputStream inputStream = socket.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            while(true){
                // 循环读
                System.out.println("客户\t" + socket.getPort() + "\t说:" + bufferedReader.readLine());
            }
        }
    }

    @Override
    public void start(){
        if(null==thread){
            thread = new Thread(this,this.threadName);
            thread.start();
        }
    }
}

CST.java  /**客户端发送消息实现**/
package com.example.socket.service;

import java.io.*;
import java.net.Socket;
import java.util.Queue;
import java.util.Scanner;
import java.util.concurrent.LinkedBlockingQueue;

/**
 * @description 客户端发送线程
 */
public class CST extends Thread{
    private String threadName;
    private Socket socket;
    private Thread thread;
    CST(String tn,  Socket st){
        this.threadName = tn ;
        this.socket = st ;
    }

    @Override
    public void run(){
        try {
            OutputStream outputStream = socket.getOutputStream();
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
            BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
            Queue<String> queue = new LinkedBlockingQueue();
            // 循环发消息
            while (true) {
                Scanner scanner = new Scanner(System.in);
                if(scanner.hasNext()){
                    queue.add(scanner.next());
                }

                for (String s : queue ) {
                     bufferedWriter.write("\t" + s +"\n");
                     bufferedWriter.flush();
                }
                queue.clear();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void start(){
        if(null==thread){
            thread = new Thread(this,this.threadName);
            thread.start();
        }
    }
}

CRT.java  /**客户端接收消息实现**/
package com.example.socket.service;

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

public class CRT extends  Thread{
    private String threadName;
    private Socket socket;
    private Thread thread;
    CRT(String tn, Socket st){
        this.threadName = tn ;
        this.socket = st ;
    }

    @Override
    public void run(){
        try {
            InputStream inputStream = socket.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            // 循环读消息
            while (true) {
                 System.out.println("服务器说：" + bufferedReader.readLine());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void start(){
        if(null==thread){
            thread = new Thread(this,this.threadName);
            thread.start();
        }
    }


}

注意：

1) 先启动Server.java  之后再启动Client.java

2) 由于是测试demo，所有没有对资源进行关流处理，大家可自行斟酌