springboot和websocket

SpringBoot 使用 WebSocket 非常方便，依赖上仅需要添加相应的 Starter 即可。

1.添加 starter 依赖

在maven中添加引用

   <!--websocket-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
            <version>1.3.5.RELEASE</version>
        </dependency>

2.添加websocket配置

package com.ckfuture.springcloud.config;

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

@Configuration
public class WebSocketConfig {

    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
       return new ServerEndpointExporter();
    }
}

3.通信处理类

package com.ckfuture.springcloud.config;

import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint(value = "/websocket")
@Component
public class MyWebSocket {

    private static int onlineCount = 0;
    private static CopyOnWriteArraySet<MyWebSocket> websocketSet = new CopyOnWriteArraySet<MyWebSocket>();

    private Session session;

    /**
     * 连接建立成功调用的方法
     * @param session
     */
    @OnOpen
    public void onOpen(Session session){
        this.session = session;
        websocketSet.add(this);
        addOnlineCount();
        System.out.println("有新连接加入！当前在线人数为："+getOnlineCount());
        try{
            sendMessage("8888");
        }catch (IOException e){
            System.out.println("IO异常");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(){
        websocketSet.remove(this);
        subOnlineCount();
        System.out.println("有一连接关闭！当前在线人数为："+getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     * @param message
     * @param session
     */
    @OnMessage
    public void onMessage(String message,Session session){
        System.out.println("来自客户端的消息："+message);

        for(MyWebSocket item : websocketSet){
            try{
                item.sendMessage(message);
            }catch (IOException e){
                e.printStackTrace();
            }
        }
    }

    /**
     * 发生错误时候调用的方法
     * @param session
     * @param error
     */
    @OnError
    public void one rror(Session session,Throwable error){
        System.out.println("发生错误");
        error.printStackTrace();
    }

    /**
     * 发送消息方法
     * @param message 消息内容
     * @throws IOException
     */
    public void sendMessage(String message) throws IOException{
        this.session.getBasicRemote().sendText(message);
    }
    public static void sendInfo(String message) throws IOException{
        for(MyWebSocket item : websocketSet){
            try{
                item.sendMessage(message);
            }catch (IOException e){
                continue;
            }
        }
    }

    public static synchronized int getOnlineCount(){
        return onlineCount;
    }
    public static synchronized void addOnlineCount(){
        MyWebSocket.onlineCount++;
    }
    public static synchronized void subOnlineCount(){
        MyWebSocket.onlineCount--;
    }

}

4.启动程序，利用在线测试工具测试

本文引用：https://blog.csdn.net/qq_40618664/article/details/118016408