spring mvc上传文件超过设定大小异常处理客户端无响应：请求的连接被重置

controller类：

    @RequestMapping(path = "/file", method = RequestMethod.POST)    public UploadMsg uploadFile(@RequestParam("uploadFile") MultipartFile file, String userCode) throws Exception {        String fileId = genFileId();        saveFileToSystem(file, fileId);        UploadMsg uploadMsg = getUploadMsg(userCode, fileId, file.getSize());        return uploadMsg;    }        @ExceptionHandler(MaxUploadSizeExceededException.class)    public ResponseEntity<String> handleException(MaxUploadSizeExceededException ex) {        System.out.println("=====================" + ex.getClass().getName());        return ResponseEntity.ok("ok");    }

spring配置文件配置文件大小不能超过1M

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">        <property name="defaultEncoding" value="UTF-8"/>        <property name="maxUploadSize" value="#{1*1024*1024}"/>        <property name="resolveLazily" value="true"/>    </bean>

下面是我用小于1M的文件访问时的情况

这是上传失败的情况

下面是我的日志打印情况

22:40:28,569 DEBUG http-apr-8080-exec-5 support.DefaultListableBeanFactory:251 - Returning cached instance of singleton bean 'uploadFileController'=====================org.springframework.web.multipart.MaxUploadSizeExceededException22:40:28,574  WARN http-apr-8080-exec-5 commons.CommonsMultipartResolver:194 - Failed to perform multipart cleanup for servlet requestorg.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size of 1048576 bytes exceeded; nested exception is org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (6145455) exceeds the configured maximum (1048576)    at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:162)    at org.springframework.web.multipart.commons.CommonsMultipartResolver$1.initializeMultipart(CommonsMultipartResolver.java:134)    at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getMultipartFiles(AbstractMultipartHttpServletRequest.java:126)    at org.springframework.web.multipart.support.AbstractMultipartHttpServletRequest.getMultiFileMap(AbstractMultipartHttpServletRequest.java:106)    at org.springframework.web.multipart.commons.CommonsMultipartResolver.cleanupMultipart(CommonsMultipartResolver.java:191)    at org.springframework.web.servlet.DispatcherServlet.cleanupMultipart(DispatcherServlet.java:1107)    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)    at org.apache.catalina.core.StandardContextValve.__invoke(StandardContextValve.java:106)    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java)    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)    at org.apache.catalina.core.StandardHostValve.__invoke(StandardHostValve.java:141)    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java)    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2500)    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2489)    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)    at java.lang.Thread.run(Thread.java:745)Caused by: org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (6145455) exceeds the configured maximum (1048576)    at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:968)    at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310)    at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334)    at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)    at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158)    ... 35 more

=====================org.springframework.web.multipart.MaxUploadSizeExceededException

这句是我在@ExceptionHandler(MaxUploadSizeExceededException.class)注解的方法中打印的。

解决方案：

当看到这文章的时候相信你现在应该遇到这样的问题了，我也是自己遇到了后来找到解决方案了记录下来，如果下次遇到就可以直接解决了。

至于为什么会出现这样的情况，可以看这篇文章：https://bz.apache.org/bugzilla/show_bug.cgi?id=57438

在文章中说明了这可能是tomcat服务器的bug问题，而非Spring MVC框架问题，如果使用tomcat7.0.39版本的话，这个问题就不存在了。

所以针对Spring MVC文件上传大小限制出现的这个问题，可以换用tomcat7.0.39版本的tomcat服务器；或者使用另一种思路：

首先，把maxUploadSize 设置大一点，让它不会抛异常出来，配置如下：

<!-- 多部分文件上传 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><!-- 最大上传大小,不能超过40M  @see #FileUploadInterceptor --><property name="maxUploadSize" value="41943040"/><property name="maxInMemorySize" value="4096"/><property name="defaultEncoding" value="UTF-8"/></bean>

或者不使用Spring MVC提供的文件上传大小限制属性<property name="maxUploadSize" value="5242880" /> 配置如下：

<!-- 配置文件上传类型解析器 multipartResolver--><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

然后创建一个拦截器控制上传大小，然后抛出同样的异常出来，或者也可以直接在拦截器中处理异常。

public class FileUploadInterceptor implements HandlerInterceptor {    private long maxSize;    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {        if(request!=null && ServletFileUpload.isMultipartContent(request)) {            ServletRequestContext ctx = new ServletRequestContext(request);            long requestSize = ctx.contentLength();            if (requestSize > maxSize) {                throw new MaxUploadSizeExceededException(maxSize);            }        }        return true;    }    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {    }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {    }    public void setMaxSize(long maxSize) {        this.maxSize = maxSize;    }}

然后在spring-mvc.xml中配置

<mvc:interceptors><mvc:interceptor><mvc:mapping path="/**"/><bean class="com.lvrounet.peiniang.interceptor.FileUploadInterceptor"><property name="maxSize" value="4194304"/></bean><mvc:interceptor></mvc:interceptors>

这样就可以完成在Spring MVC环境下文件上传大小的限制以及异常正确捕获了。

在Controller类中进行异常捕捉或定义全局异常捕捉(略)：

@ExceptionHandlerpublic ModelAndView handleException(Exception ex, HttpServletRequest request, HttpServletResponse response) throws IOException {// 处理文件上传过大异常if (ex instanceof MaxUploadSizeExceededException) {ex.printStackTrace();long maxSize = ((MaxUploadSizeExceededException) ex).getMaxUploadSize();  logger.error("File size can’t exceed " + maxSize / (1024*1024) + "M", ex);CommonResult result = new CommonResult();result.setResult(2);result.setErrormsg("File size can’t exceed " + maxSize / (1024*1024) + "M"); response.setHeader("Content-type", "text/html;charset=UTF-8");response.getWriter().write(result.toString());  }return null;}