WebSocket 集成

pom.xml

@@ -159,6 +159,11 @@
             <artifactId>nekohtml</artifactId>
             <version>1.9.22</version>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-websocket</artifactId>
+            <version>2.2.1.RELEASE</version>
+        </dependency>
     </dependencies>
 
     <build>

src/main/java/com/rymcu/vertical/config/WebSocketConfigurer.java

@@ -0,0 +1,17 @@
+package com.rymcu.vertical.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.socket.server.standard.ServerEndpointExporter;
+
+/**
+ * WebSocket 配置类
+ * @author ronger
+ */
+@Configuration
+public class WebSocketConfigurer {
+    @Bean
+    public ServerEndpointExporter serverEndpointExporter() {
+        return new ServerEndpointExporter();
+    }
+}

src/main/java/com/rymcu/vertical/web/api/common/WebSocketServer.java

@@ -0,0 +1,130 @@
+package com.rymcu.vertical.web.api.common;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
+
+import javax.websocket.*;
+import javax.websocket.server.PathParam;
+import javax.websocket.server.ServerEndpoint;
+import java.io.IOException;
+import java.util.concurrent.CopyOnWriteArraySet;
+
+/**
+ * @author ronger
+ */
+@ServerEndpoint("/api/v1/websocket/{sid}")
+@Component
+public class WebSocketServer {
+    static final Logger log= LoggerFactory.getLogger(WebSocketServer.class);
+    /**
+     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
+     * */
+    private static int onlineCount = 0;
+    /**
+     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
+     */
+    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
+
+
+    /**
+     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
+     */
+    private Session session;
+
+    /**
+     * 接收sid
+     * */
+    private String sid = "";
+    /**
+     * 连接建立成功调用的方法*/
+    @OnOpen
+    public void onOpen(Session session,@PathParam("sid") String sid) {
+        this.session = session;
+        webSocketSet.add(this);
+        addOnlineCount();
+        log.info("有新窗口开始监听:" + sid + ",当前在线人数为" + getOnlineCount());
+        this.sid=sid;
+        try {
+            sendMessage("连接成功");
+        } catch (IOException e) {
+            log.error("websocket IO异常");
+        }
+    }
+
+    /**
+     * 连接关闭调用的方法
+     */
+    @OnClose
+    public void onClose() {
+        webSocketSet.remove(this);
+        subOnlineCount();
+        log.info("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 客户端发送过来的消息*/
+    @OnMessage
+    public void onMessage(String message, Session session) {
+        log.info("收到来自窗口" + sid + "的信息:" + message);
+        //群发消息
+        for (WebSocketServer item : webSocketSet) {
+            try {
+                item.sendMessage(message);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    /**
+     *
+     * @param session
+     * @param error
+     */
+    @OnError
+    public void onError(Session session, Throwable error) {
+        log.error("发生错误");
+        error.printStackTrace();
+    }
+    /**
+     * 实现服务器主动推送
+     */
+    public void sendMessage(String message) throws IOException {
+        this.session.getBasicRemote().sendText(message);
+    }
+
+
+    /**
+     * 群发自定义消息
+     * */
+    public static void sendInfo(String message,@PathParam("sid") String sid) throws IOException {
+        log.info("推送消息到窗口"+sid+"，推送内容:"+message);
+        for (WebSocketServer item : webSocketSet) {
+            try {
+                //这里可以设定只推送给这个sid的，为null则全部推送
+                if(sid==null) {
+                    item.sendMessage(message);
+                }else if(item.sid.equals(sid)){
+                    item.sendMessage(message);
+                }
+            } catch (IOException e) {
+                continue;
+            }
+        }
+    }
+
+    public static synchronized int getOnlineCount() {
+        return onlineCount;
+    }
+
+    public static synchronized void addOnlineCount() {
+        WebSocketServer.onlineCount++;
+    }
+
+    public static synchronized void subOnlineCount() {
+        WebSocketServer.onlineCount--;
+    }
+}