Spring Boot 开发私有即时通信系统（WebSocket）

<properties> <java.version>1.8</java.version> <thymeleaf.version>3.0.0.RELEASE</thymeleaf.version> <thymeleaf-layout-dialect.version>2.0.0</thymeleaf-layout-dialect.version> </properties> <dependencies> <!-- WebSocket依赖，移除Tomcat容器 --> <dependency>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-websocket</artifactId>  <exclusions>  <exclusion>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-tomcat</artifactId>  </exclusion>  </exclusions> </dependency> <!-- 使用Undertow容器 --> <dependency>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-undertow</artifactId> </dependency> <!-- Spring Security 框架 --> <dependency>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-security</artifactId> </dependency> <!-- MongoDB数据库 --> <dependency>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-data-mongodb</artifactId> </dependency> <!-- Thymeleaf 模版引擎 --> <dependency>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency>  <groupId>org.projectlombok</groupId>  <artifactId>lombok</artifactId>  <version>1.16.16</version> </dependency> <dependency>  <groupId>com.alibaba</groupId>  <artifactId>fastjson</artifactId>  <version>1.2.30</version> </dependency> <!-- 静态资源 --> <dependency>  <groupId>org.webjars</groupId>  <artifactId>webjars-locator</artifactId> </dependency> <dependency>  <groupId>org.webjars</groupId>  <artifactId>sockjs-client</artifactId>  <version>1.0.2</version> </dependency> <dependency>  <groupId>org.webjars</groupId>  <artifactId>stomp-websocket</artifactId>  <version>2.3.3</version> </dependency> <dependency>  <groupId>org.webjars</groupId>  <artifactId>bootstrap</artifactId>  <version>3.3.7</version> </dependency> <dependency>  <groupId>org.webjars</groupId>  <artifactId>jquery</artifactId>  <version>3.1.0</version> </dependency> </dependencies>