Websocket 客户端 +服务端 （用户——TCP连接）

服务端

pom.xml

  		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
        </dependency>

代码实现

package com.example.config;

import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

/**
 * @author hy
 * @description:
 * @date 2021/01/18
 */

@Component
public class WebSocketConfig {
    /**
     * ServerEndpointExporter 作用
     *
     * 这个Bean会自动注册使用@ServerEndpoint注解声明的websocket endpoint
     *
     * @return
     */
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

package com.example.controller;

/**
 * @author hy
 * @description:
 * @date 2021/01/18
 */

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import java.util.concurrent.ConcurrentHashMap;

/**
 *
 * @ServerEndpoint 这个注解有什么作用？
 *
 * 这个注解用于标识作用在类上，它的主要功能是把当前类标识成一个WebSocket的服务端
 * 注解的值用户客户端连接访问的URL地址
 *
 */

@Slf4j
@Component
@ServerEndpoint("/websocket")
public class WebSocket {

    /**
     *  与某个客户端的连接对话，需要通过它来给客户端发送消息
     */
    private Session session;

    /**
     * 标识当前连接客户端的用户名
     */
    private String name;

    /**
     *  用于存所有的连接服务的客户端，这个对象存储是安全的
     */
    private static ConcurrentHashMap<String,WebSocket> webSocketSet = new ConcurrentHashMap<>();


    @OnOpen
    public void OnOpen(){

        log.info("[WebSocket] 连接成功");
    }


    @OnClose
    public void OnClose(){
        webSocketSet.remove(this.name);
        log.info("[WebSocket] 退出成功");
    }

    @OnMessage
    public void OnMessage(String message,Session session){
        log.info("[WebSocket] 收到消息：{}",message);
        log.info("[WebSocket] 收到消息：{}",session);
        //判断是否需要指定发送，具体规则自定义
        if(message.indexOf("TOUSER") == 0){
            String name = message.substring(message.indexOf("TOUSER")+6,message.indexOf(";"));
            this.session = session;
            this.name = name;
            // name是用来表示唯一客户端，如果需要指定发送，需要指定发送通过name来区分
            log.info(name);
            webSocketSet.put(name,this);
            AppointSending(name,message.substring(message.indexOf(";")+1,message.length()));
        }else{
            GroupSending(message);
        }

    }

    /**
     * 群发
     * @param message
     */
    public void GroupSending(String message){
        for (String name : webSocketSet.keySet()){
            try {
                webSocketSet.get(name).session.getBasicRemote().sendText(message);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    /**
     * 指定发送
     * @param name
     * @param message
     */
    public void AppointSending(String name,String message){
        try {
            webSocketSet.get(name).session.getBasicRemote().sendText(message);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

客户端

pom.xml

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--websocket作为客户端-->
        <dependency>
            <groupId>org.java-websocket</groupId>
            <artifactId>Java-WebSocket</artifactId>
            <version>1.3.5</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
        </dependency>

代码实现

package com.example.controller;


import lombok.extern.slf4j.Slf4j;
import org.java_websocket.client.WebSocketClient;
import org.java_websocket.drafts.Draft_6455;
import org.java_websocket.handshake.ServerHandshake;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.net.URI;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author hy
 * @description:
 * @date 2021/01/18
 */
@RestController
@RequestMapping("/websocket1")
@Slf4j
public class MessageController {

    private static ConcurrentHashMap<String, WebSocketClient> webSocketSet = new ConcurrentHashMap<>();

    @GetMapping("/connect")
    public void sendMessage(String name) {
        WebSocketClient webSocketClient = webSocketClient(name);
        webSocketSet.put(name,webSocketClient);
    }

    @GetMapping("/chat")
    public void chat(String name, String message) {
        webSocketSet.get(name).send(message);
    }

    public WebSocketClient webSocketClient(String name) {
        try {
            WebSocketClient webSocketClient = new WebSocketClient(new URI("ws://localhost:8085/websocket/"+name), new Draft_6455()) {
                @Override
                public void onOpen(ServerHandshake handshakedata) {
                    log.info("[websocket] 连接成功");
                }

                @Override
                public void onMessage(String message) {
                    log.info("[websocket] 收到消息={}", message);
                }

                @Override
                public void onClose(int code, String reason, boolean remote) {
                    log.info("[websocket] 退出连接");
                }

                @Override
                public void onError(Exception ex) {
                    log.info("[websocket] 连接错误={}", ex.getMessage());
                }
            };
            webSocketClient.connect();
            return webSocketClient;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}