上传大文件后，Spring MVC会话属性丢失

时间：2013-05-28 17:50:00

标签： java session spring-mvc file-upload exception-handling

我的Spring MVC应用程序的一个功能是上传大文件（大约500MB），应该稍后处理。

控制器是：

@RequestMapping("/folderManagement/")
@Controller("FolderFormController")
@SessionAttributes({ "tabTitle", "selectedFolder" })
public class FolderFormController {
    @RequestMapping(method = RequestMethod.GET, value = FOLDER_FORM)
    protected ModelAndView showFolderManager(@RequestParam(value = "selectedFolderId", required = false) Long selectedFolderId,
            @RequestParam(value = "selectedDocId", required = false) Long selectedDocId, HttpServletRequest request, HttpServletResponse response) throws Exception {
        // Generates the page attributes
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName(FOLDER_FORM_VIEW);

        return modelAndView;
    }

    @RequestMapping(value = UPLOAD_FILES, method = RequestMethod.POST)
    public ModelAndView postUploadFile(HttpServletRequest request, @ModelAttribute("uploadItem") UploadItem upitem, @ModelAttribute("selectedFolder") FolderForm root, BindingResult result,
            SessionStatus status, ModelAndView modelAndView) {
        // Process upitem
        Log.debug("INIT");
    }

}

UploadItem是一个内部有CommonsMultipartFile（org.springframework.web.multipart.commons）的对象。

通常可行。无论文件大小（甚至800MB），也不需要处理时间。但是，有时用户会遇到以下异常：

org.springframework.web.HttpSessionRequiredException: Expected session attribute 'selectedFolder'
    at org.springframework.web.method.annotation.ModelFactory.initModel(ModelFactory.java:103)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:614)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptorFilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:448)
    at org.apache.coyote.ajp.AjpAprProtocol$AjpConnectionHandler.process(AjpAprProtocol.java:403)
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1703)
    at java.lang.Thread.run(Thread.java:662)

此方法可以捕获此异常：

@ExceptionHandler({ Exception.class})
public ModelAndView handleExceptionArray(Exception ex) {
    Log.error("Recogida excepcion " + ex.getClass().getSimpleName(), ex);
    String errorMessage = "Internal error";
    ModelAndView modelAndView = new ModelAndView();
    // modelAndView.setViewName("error/error");
    modelAndView.addObject("name", "");
    modelAndView.addObject("exception", errorMessage);

    modelAndView.setViewName("redirect:" + FolderFormController.getRedirectUrl());
    saveError(modelAndView, errorMessage);
    return modelAndView;
}

此外，不会打印Log“INIT”，因此它不会进入控制器方法。

发生了什么事？而且，更重要的是，我怎么能避免这种情况？有什么想法吗？

更新：原因

好吧，似乎原因是用户会话到期。 Tomcat的到期时间为30分钟。如果上传的次数超过了，那么它就无法到达我的控制器。有没有办法避免会话丢失？

1 个答案:

答案 0 :(得分：1)

您已经发现它必定是会话超时的问题，很好。如果在上传开始后没有新请求到达特定会话，则认为“无活动”在您的情况下不正确。

有几种方法可以解决这个问题：

<强>的web.xml

在web.xml中增加超时，Tomcat中的默认值为30'（即，如果未在web.xml中指定）。

<session-config>
  <session-timeout>45</session-timeout>
</session-config>

然而，这可能并不理想，因为根据经验，超时应该“尽可能低” - 无论这意味着什么。我们通常使用5'。

更改会话

您可以将常规会话超时设置为5'，但在使用HttpSession#setMaxInactiveInterval开始上传后将其增加：

  

指定客户端请求之前的时间（以秒为单位）   servlet容器将使此会话无效。负面的时间   表示会话永远不会超时。

但是，如果您的控制器甚至没有调用，则必须在Spring之前完成。最佳候选人是ServletFilter。

<强> AJAX

在提交上传后立即从客户端发出心跳请求。然后循环重复心跳。如果会话超时为5'，则可以使用4'的心跳间隔。

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