初始提交，实现WebSocket聊天室基本功能

src/main/java/cn/airnan/dg/configs/WebSocketConfiguration.java

@@ -0,0 +1,14 @@
+package cn.airnan.dg.configs;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.socket.server.standard.ServerEndpointExporter;
+
+@Configuration
+public class WebSocketConfiguration {
+
+    @Bean
+    public ServerEndpointExporter serverEndpointExporter() {
+        return new ServerEndpointExporter();
+    }
+}