天天玩微信，Spring Boot 开发私有即时通信系统了解一下

1/ 概述

利用Spring Boot作为基础框架，Spring Security作为安全框架，WebSocket作为通信框架，实现点对点聊天和群聊天。

2/ 所需依赖

Spring Boot 版本 1.5.3，使用MongoDB存储数据（非必须），Maven依赖如下：

<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>