1、整合websocket。

ruoyi-framework/pom.xml

@@ -71,6 +71,12 @@
             <version>9.0.0</version>
         </dependency>
 
+        <!-- SpringBoot Websocket -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-websocket</artifactId>
+        </dependency>
+
     </dependencies>
 
 </project>
\ No newline at end of file

ruoyi-framework/src/main/java/com/ruoyi/framework/websocket/SemaphoreUtils.java

+package com.ruoyi.framework.websocket;
+
+import java.util.concurrent.Semaphore;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * 信号量相关处理
+ * 
+ * @author ruoyi
+ */
+public class SemaphoreUtils
+{
+
+    /**
+     * SemaphoreUtils 日志控制器
+     */
+    private static final Logger LOGGER = LoggerFactory.getLogger(SemaphoreUtils.class);
+
+    /**
+     * 获取信号量
+     * 
+     * @param semaphore
+     * @return
+     */
+    public static boolean tryAcquire(Semaphore semaphore)
+    {
+        boolean flag = false;
+
+        try
+        {
+            flag = semaphore.tryAcquire();
+        }
+        catch (Exception e)
+        {
+            LOGGER.error("获取信号量异常", e);
+        }
+
+        return flag;
+    }
+
+    /**
+     * 释放信号量
+     * 
+     * @param semaphore
+     */
+    public static void release(Semaphore semaphore)
+    {
+
+        try
+        {
+            semaphore.release();
+        }
+        catch (Exception e)
+        {
+            LOGGER.error("释放信号量异常", e);
+        }
+    }
+}

ruoyi-framework/src/main/java/com/ruoyi/framework/websocket/WebSocketConfig.java

+package com.ruoyi.framework.websocket;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.socket.server.standard.ServerEndpointExporter;
+
+/**
+ * websocket 配置
+ * 
+ * @author ruoyi
+ */
+@Configuration
+public class WebSocketConfig
+{
+    @Bean
+    public ServerEndpointExporter serverEndpointExporter()
+    {
+        return new ServerEndpointExporter();
+    }
+}

ruoyi-framework/src/main/java/com/ruoyi/framework/websocket/WebSocketServer.java

+package com.ruoyi.framework.websocket;
+
+import java.util.concurrent.Semaphore;
+import javax.websocket.OnClose;
+import javax.websocket.OnError;
+import javax.websocket.OnMessage;
+import javax.websocket.OnOpen;
+import javax.websocket.Session;
+import javax.websocket.server.PathParam;
+import javax.websocket.server.ServerEndpoint;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
+
+/**
+ * websocket 消息处理
+ * 
+ * @author ruoyi
+ */
+@Component
+@ServerEndpoint("/websocket/{userid}")
+public class WebSocketServer
+{
+    /**
+     * WebSocketServer 日志控制器
+     */
+    private static final Logger LOGGER = LoggerFactory.getLogger(WebSocketServer.class);
+
+    /**
+     * 默认最多允许同时在线人数100
+     */
+    public static int socketMaxOnlineCount = 100;
+
+    private static Semaphore socketSemaphore = new Semaphore(socketMaxOnlineCount);
+
+    /**
+     * 连接建立成功调用的方法
+     */
+    @OnOpen
+    public void onOpen(Session session, @PathParam("userid") Long userid) throws Exception
+    {
+        boolean semaphoreFlag = false;
+        // 尝试获取信号量
+        semaphoreFlag = SemaphoreUtils.tryAcquire(socketSemaphore);
+        if (!semaphoreFlag)
+        {
+            // 未获取到信号量
+            LOGGER.error("\n 当前在线人数超过限制数- {}", socketMaxOnlineCount);
+            WebSocketUsers.sendMessageToUserByText(session, "当前在线人数超过限制数：" + socketMaxOnlineCount);
+            session.close();
+        }
+        else
+        {
+            // 添加用户
+            WebSocketUsers.put(session.getId(), session, userid);
+            LOGGER.info("\n 建立连接 - {}", session);
+            LOGGER.info("\n 当前人数 - {}", WebSocketUsers.getUsers().size());
+            WebSocketUsers.sendMessageToUserByText(session, "连接成功");
+        }
+    }
+
+    /**
+     * 连接关闭时处理
+     */
+    @OnClose
+    public void onClose(Session session)
+    {
+        LOGGER.info("\n 关闭连接 - {}", session);
+        // 移除用户
+        WebSocketUsers.remove(session.getId());
+        // 获取到信号量则需释放
+        SemaphoreUtils.release(socketSemaphore);
+    }
+
+    /**
+     * 抛出异常时处理
+     */
+    @OnError
+    public void onError(Session session, Throwable exception) throws Exception
+    {
+        if (session.isOpen())
+        {
+            // 关闭连接
+            session.close();
+        }
+        String sessionId = session.getId();
+        LOGGER.info("\n 连接异常 - {}", sessionId);
+        LOGGER.info("\n 异常信息 - {}", exception);
+        // 移出用户
+        WebSocketUsers.remove(sessionId);
+        // 获取到信号量则需释放
+        SemaphoreUtils.release(socketSemaphore);
+    }
+
+    /**
+     * 服务器接收到客户端消息时调用的方法
+     */
+    @OnMessage
+    public void onMessage(String message, Session session)
+    {
+        String msg = message.replace("你", "我").replace("吗", "");
+        WebSocketUsers.sendMessageToUserByText(session, msg);
+    }
+}

ruoyi-framework/src/main/java/com/ruoyi/framework/websocket/WebSocketUsers.java

+package com.ruoyi.framework.websocket;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import javax.websocket.Session;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * websocket 客户端用户集
+ * 
+ * @author ruoyi
+ */
+public class WebSocketUsers
+{
+    /**
+     * WebSocketUsers 日志控制器
+     */
+    private static final Logger LOGGER = LoggerFactory.getLogger(WebSocketUsers.class);
+
+    /**
+     * 用户集
+     */
+    private static Map<String, WebSocketSession> USERS = new ConcurrentHashMap();
+
+    /**
+     * 存储用户
+     *
+     * @param key 唯一键
+     * @param session 用户信息
+     */
+    public static void put(String key, Session session, Long userId)
+    {
+        USERS.put(key, new WebSocketSession(userId, session));
+    }
+
+    /**
+     * 移出用户
+     *
+     * @param key 键
+     */
+    public static boolean remove(String key)
+    {
+        LOGGER.info("\n 正在移出用户 - {}", key);
+        WebSocketSession remove = USERS.remove(key);
+        if (remove != null)
+        {
+            boolean containsValue = USERS.containsValue(remove);
+            LOGGER.info("\n 移出结果 - {}", containsValue ? "失败" : "成功");
+            return containsValue;
+        }
+        else
+        {
+            return true;
+        }
+    }
+
+    /**
+     * 获取在线用户列表
+     *
+     * @return 返回用户集合
+     */
+    public static Map<String, WebSocketSession> getUsers()
+    {
+        return USERS;
+    }
+
+    /**
+     * 群发消息文本消息
+     *
+     * @param message 消息内容
+     */
+    public static void sendMessageToUsersByText(String message)
+    {
+        Collection<WebSocketSession> values = USERS.values();
+        for (WebSocketSession value : values)
+        {
+            sendMessageToUserByText(value.getSession(), message);
+        }
+    }
+
+    /**
+     * 发送文本消息
+     *
+     * @param session 用户session
+     * @param message 消息内容
+     */
+    public static void sendMessageToUserByText(Session session, String message)
+    {
+        if (session != null)
+        {
+            try
+            {
+                session.getBasicRemote().sendText(message);
+            }
+            catch (IOException e)
+            {
+                LOGGER.error("\n[发送消息异常]", e);
+            }
+        }
+        else
+        {
+            LOGGER.info("\n[你已离线]");
+        }
+    }
+
+    /**
+     * 发送文本消息
+     *
+     * @param userId  用户id
+     * @param message 消息内容
+     */
+    public static void sendMessageToUserByUserId(Long userId, String message) {
+
+        Map<String, WebSocketSession> users = getUsers();
+
+        for(String key : users.keySet()) {
+            WebSocketSession webSocketSession = users.get(key);
+
+            if(webSocketSession.getUserId().equals(userId)) {
+                sendMessageToUserByText(webSocketSession.getSession(), message);
+            }
+        }
+    }
+
+    private static class WebSocketSession {
+
+        private Long userId;
+
+        private Session session;
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            WebSocketSession that = (WebSocketSession) o;
+            return Objects.equals(userId, that.userId) && Objects.equals(session, that.session);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(userId, session);
+        }
+
+        public WebSocketSession(Long userId, Session session) {
+            this.userId = userId;
+            this.session = session;
+        }
+
+        public Long getUserId() {
+            return userId;
+        }
+
+        public void setUserId(Long userId) {
+            this.userId = userId;
+        }
+
+        public Session getSession() {
+            return session;
+        }
+
+        public void setSession(Session session) {
+            this.session = session;
+        }
+    }
+}