[后端] webSocket demo跑通

backend/microservice-provider-access-8002/pom.xml

@@ -103,6 +103,12 @@
             <groupId>com.squareup.okhttp3</groupId>
             <artifactId>okhttp</artifactId>
         </dependency>
+
+        <!-- WebSocket -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-websocket</artifactId>
+        </dependency>
     </dependencies>