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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> <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></div>
配置文件内容：
server: port: 80 # 若使用MongoDB则配置如下参数 spring: data: mongodb: uri: mongodb://username:password@172.25.11.228:27017 authentication-database: admin database: chat</div>
大致程序结构，仅供参考：
3/ 创建程序启动类，启用WebSocket
使用@EnableWebSocket注解
@SpringBootApplication
@EnableWebSocket
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
</div>
4/ 配置Spring Security
此章节省略。（配置好Spring Security，用户能正常登录即可）
5/ 配置Web Socket（结合第7节的JS看）
@Configuration
@EnableWebSocketMessageBroker
@Log4j
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
// 此处可注入自己写的Service
@Override
public void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {
// 客户端与服务器端建立连接的点
stompEndpointRegistry.addEndpoint("/any-socket").withSockJS();
}
@Override
public void configureMessageBroker(MessageBrokerRegistry messageBrokerRegistry) {
// 配置客户端发送信息的路径的前缀
messageBrokerRegistry.setApplicationDestinationPrefixes("/app");
messageBrokerRegistry.enableSimpleBroker("/topic");
}
@Override
public void configureWebSocketTransport(final WebSocketTransportRegistration registration) {
registration.addDecoratorFactory(new WebSocketHandlerDecoratorFactory() {
@Override
public WebSocketHandler decorate(final WebSocketHandler handler) {
return new WebSocketHandlerDecorator(handler) {
@Override
public void afterConnectionEstablished(final WebSocketSession session) throws Exception {
// 客户端与服务器端建立连接后，此处记录谁上线了
String username = session.getPrincipal().getName();
log.info("online: " + username);
super.afterConnectionEstablished(session);
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
// 客户端与服务器端断开连接后，此处记录谁下线了
String username = session.getPrincipal().getName();
log.info("offline: " + username);
super.afterConnectionClosed(session, closeStatus);
}
};
}
});
super.configureWebSocketTransport(registration);
}
}
</div>
6/ 点对点消息，群消息
@Controller
@Log4j
public class ChatController {
@Autowired
private SimpMessagingTemplate template;
// 注入其它Service
// 群聊天
@MessageMapping("/notice")
public void notice(Principal principal, String message) {
// 参数说明 principal 当前登录的用户， message 客户端发送过来的内容
// principal.getName() 可获得当前用户的username
// 发送消息给订阅 "/topic/notice" 且在线的用户
template.convertAndSend("/topic/notice", message);
}
// 点对点聊天
@MessageMapping("/chat")
public void chat(Principal principal, String message){
// 参数说明 principal 当前登录的用户， message 客户端发送过来的内容（应该至少包含发送对象toUser和消息内容content）
// principal.getName() 可获得当前用户的username
// 发送消息给订阅 "/user/topic/chat" 且用户名为toUser的用户
template.convertAndSendToUser(toUser, "/topic/chat", content);
}
}
</div>
7/ 客户端与服务器端交互
var stompClient = null;
function connect() {
var socket = new SockJS('/any-socket');
stompClient = Stomp.over(socket);
stompClient.connect({}, function (frame) {
// 订阅 /topic/notice 实现群聊
stompClient.subscribe('/topic/notice', function (message) {
showMessage(JSON.parse(message.body));
});
// 订阅 /user/topic/chat 实现点对点聊
stompClient.subscribe('/user/topic/chat', function (message) {
showMessage(JSON.parse(message.body));
});
});
}
function showMessage(message) {
// 处理消息在页面的显示
}
$(function () {
// 建立websocket连接
connect();
// 发送消息按钮事件
$("#send").click(function () {
if (target == "TO_ALL"){
// 群发消息
// 匹配后端ChatController中的 @MessageMapping("/notice")
stompClient.send("/app/notice", {}, '消息内容');
}else{
// 点对点消息，消息中必须包含对方的username
// 匹配后端ChatController中的 @MessageMapping("/chat")
var content = "{'content':'消息内