相关疑难解决方法(0)

我试图使用Servlet API 3中定义的异步处理实现COMET聊天.它无法正常工作 - 聊天被阻止,所以我创建了调试servlet来仅测试异步部分.

这是我的doGet方法:

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    log.debug("doGet called");
    int timeout = 30 + RandomUtils.nextInt(60);
    String message = RandomStringUtils.randomAlphanumeric(50 + RandomUtils.nextInt(250));
    response.setHeader("Access-Control-Allow-Origin", "*");
    final AsyncContext context = request.startAsync();

    synchronized(items) {
        items.add(new RequestItem(context, message, timeout));
    }
    log.debug("doGet created request and finished");
}

我将请求项放入队列,并且有一个线程在运行,它将在指定的超时后获取项目并将响应发送到AsyncContext,打印有关它的消息.问题是,线程被阻塞,直到AsyncContext得到响应.这是在浏览器中请求4页加载后在我的日志中可见的内容:

2011-12-08 13:56:36,923 DEBUG [my.servlet.TestAsyncServlet] doGet called
2011-12-08 13:56:36,952 DEBUG [my.servlet.TestAsyncServlet] doGet created request and finished
2011-12-08 13:57:39,934 TRACE [my.servlet.TestAsyncServlet] respond on item RequestItem [context=org.apache.catalina.core.AsyncContextImpl@175870a, message=zEQpATavzwFl6qIbBKve4OzIY9UUuZBwbqN1TC5KpU3i8LM9B6ChgUqaRmcT2yF, timeout=0]
2011-12-08 13:57:39,962 …

我有Spring Boot配置的问题.我在一些应该使用套接字的移动设备上遇到异常:

java.lang.IllegalArgumentException: Async support must be enabled on a servlet and for all filters involved in async request processing. This is done in Java code using the Servlet API or by adding "<async-supported>true</async-supported>" to servlet and filter declarations in web.xml. Also you must use a Servlet 3.0+ container
    at org.springframework.util.Assert.isTrue(Assert.java:65)
    at org.springframework.http.server.ServletServerHttpAsyncRequestControl.<init>(ServletServerHttpAsyncRequestControl.java:59)
    at org.springframework.http.server.ServletServerHttpRequest.getAsyncRequestControl(ServletServerHttpRequest.java:202)
    at org.springframework.web.socket.sockjs.transport.session.AbstractHttpSockJsSession.handleInitialRequest(AbstractHttpSockJsSession.java:202)
    at org.springframework.web.socket.sockjs.transport.handler.AbstractHttpSendingTransportHandler.handleRequestInternal(AbstractHttpSendingTransportHandler.java:66)
    at org.springframework.web.socket.sockjs.transport.handler.AbstractHttpSendingTransportHandler.handleRequest(AbstractHttpSendingTransportHandler.java:58)
    at org.springframework.web.socket.sockjs.transport.TransportHandlingSockJsService.handleTransportRequest(TransportHandlingSockJsService.java:254)
    at org.springframework.web.socket.sockjs.support.AbstractSockJsService.handleRequest(AbstractSockJsService.java:322)
    at org.springframework.web.socket.sockjs.support.SockJsHttpRequestHandler.handleRequest(SockJsHttpRequestHandler.java:88)
    at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:51)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
    at …