SSM+WebSocket实现一个简易网页版通讯工具

编译环境：jdk1.8 , tomcat8.0+ , IDEA

这里主要讲一下websocket的信息传递，以如何实现多人实时在线聊天为例：

websocket主要的三个类

MyWebSocketConfig主要负责配置websocket的处理器和握手拦截器

MyHandShakeInterceptor 是websocket的拦截器

MyWebSocketHander是websocket的处理器

@Component
@EnableWebSocket
public class MyWebSocketConfig implements WebSocketConfigurer {

    @Autowired
    private MyWebSocketHander myWebSocketHander;

    private static final String LINK_URI = "websocket.do";
    //添加websocket处理器，添加握手拦截器  拦截器先执行 然后到处理器
    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry webSocketHandlerRegistry) {
        webSocketHandlerRegistry.addHandler(myWebSocketHander,LINK_URI).addInterceptors(new MyHandShakeInterceptor());
    }
}

/*   private static Map<WebSocketSession,String> map = new HashMap<WebSocketSession, String>();
 * websocket握手拦截器
 * 拦截握手前，握手后的两个切面
 */
@Component
public class MyHandShakeInterceptor implements HandshakeInterceptor {


    @Override
    public boolean beforeHandshake(ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Map<String, Object> map) throws Exception {
        if(serverHttpRequest instanceof ServletServerHttpRequest){
            HttpServletRequest servletRequest = ((ServletServerHttpRequest)serverHttpRequest).getServletRequest();
            User user = (User)servletRequest.getSession().getAttribute("user");
            //这里给map赋值 相当于websockethandler的afterConnectionEstablished方法里的WebSocketSession
            //key是session，value是变量
            map.put("ws_user", user);
          
        }
        return true;
    }

    @Override
    public void afterHandshake(ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Exception e) {
      
    }
}

实时通信的具体流程：

前端