diff --git a/spring-boot-demo-websocket-socketio/src/main/java/com/xkcoding/websocket/socketio/handler/MessageEventHandler.java b/spring-boot-demo-websocket-socketio/src/main/java/com/xkcoding/websocket/socketio/handler/MessageEventHandler.java
index 9301965..3f7b530 100644
--- a/spring-boot-demo-websocket-socketio/src/main/java/com/xkcoding/websocket/socketio/handler/MessageEventHandler.java
+++ b/spring-boot-demo-websocket-socketio/src/main/java/com/xkcoding/websocket/socketio/handler/MessageEventHandler.java
@@ -1,5 +1,6 @@
 package com.xkcoding.websocket.socketio.handler;
 
+import cn.hutool.core.util.ObjectUtil;
 import com.corundumstudio.socketio.AckRequest;
 import com.corundumstudio.socketio.SocketIOClient;
 import com.corundumstudio.socketio.SocketIOServer;
@@ -16,6 +17,7 @@ import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
+import java.util.Collection;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -112,8 +114,21 @@ public class MessageEventHandler {
 
     @OnEvent(value = Event.GROUP)
     public void onGroupEvent(SocketIOClient client, AckRequest request, GroupMessageRequest data) {
-        log.info("群号 {} 收到来自 {} 的群聊消息：{}", data.getGroupId(), data.getFromUid(), data.getMessage());
-        sendToGroup(data);
+        Collection<SocketIOClient> clients = server.getRoomOperations(data.getGroupId()).getClients();
+
+        boolean inGroup = false;
+        for (SocketIOClient socketIOClient : clients) {
+            if (ObjectUtil.equal(socketIOClient.getSessionId(), client.getSessionId())) {
+                inGroup = true;
+                break;
+            }
+        }
+        if (inGroup) {
+            log.info("群号 {} 收到来自 {} 的群聊消息：{}", data.getGroupId(), data.getFromUid(), data.getMessage());
+            sendToGroup(data);
+        } else {
+            request.sendAckData("请先加群！");
+        }
     }
 
     /**
diff --git a/spring-boot-demo-websocket-socketio/src/main/resources/static/index.html b/spring-boot-demo-websocket-socketio/src/main/resources/static/index.html
index 851e91e..48a16ff 100644
--- a/spring-boot-demo-websocket-socketio/src/main/resources/static/index.html
+++ b/spring-boot-demo-websocket-socketio/src/main/resources/static/index.html
@@ -112,7 +112,7 @@
             socket.emit('join', joinRequest);
         }
 
-        function sendMessage() {
+        function sendGroup() {
             let message = $('#msg').val();
 
             if (message === '') {
@@ -126,7 +126,11 @@
                 groupId: "666",
                 message: message
             };
-            socket.emit('group', groupRequest);
+            socket.emit('group', groupRequest, function (data) {
+                if (data) {
+                    layer.msg(data, {icon: 5});
+                }
+            });
         }
 
         function sendChat() {
@@ -171,7 +175,7 @@
     <input id="msg" class="input-xlarge" type="text" placeholder="随便输点啥"/>
     <input id="to" class="input-xlarge" type="text" placeholder="私聊发给谁"/>
     <button type="button" onClick="sendJoin()" class="btn" id="join">加入群聊</button>
-    <button type="button" onClick="sendMessage()" class="btn" id="send">群聊</button>
+    <button type="button" onClick="sendGroup()" class="btn" id="send">群聊</button>
     <button type="button" onClick="sendChat()" class="btn" id="chat">私聊</button>
     <button type="button" onClick="sendBroadcast()" class="btn">广播消息</button>
     <button type="button" onClick="sendConnect()" class="btn">连接</button>