Tomcat 8 - 最大文件大小答案

【问题标题】：Tomcat 8 - Maximum File SizeTomcat 8 - 最大文件大小
【发布时间】：2016-06-12 17:18:59
【问题描述】：

我在项目中使用 Spring-boot tomcat。

我有分段文件上传，限制设置如下。

@Bean
    MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        factory.setMaxFileSize("1MB");
        factory.setMaxRequestSize("1MB");
        return factory.createMultipartConfig();
    }

但是，如果用户尝试加载超过 1 MB 的文件，则会引发一些异常。

led; nested exception is org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (4719402) exceeds the configured maximum (1048576)] with root cause
org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (4719402) exceeds the configured maximum (1048576)
        at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:811) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.Request.parseParts(Request.java:2734) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.Request.parseParameters(Request.java:3073) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.Request.getParameter(Request.java:1095) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:380) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:70) ~[spring-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) ~[spring-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217) ~[tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) [tomcat-embed-core-8.0.28.jar:8.0.28]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_73]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_73]
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.0.28.jar:8.0.28]

我不确定，我该如何处理这个异常，以便用户在屏幕上看到一些有意义的错误消息。

【问题讨论】：

标签： spring tomcat spring-boot

【解决方案1】：

我不确定，但我认为您可以使用错误页面处理此异常：

 // in web.xml
 <error-page>
    <error-code>413</error-code>
    <location>/ErrorHandlerServlet</location>
 </error-page>
 ... handlers for other http codes ...

413 - “请求实体太大”错误的 http 代码。

声明 ErrorHandlerServlet 错误页面（例如，使用指令创建 JSP）并处理 413：

Integer statusCode = (Integer) httpRequest.
        getAttribute("javax.servlet.error.status_code");
if (statusCode == 413) {
        // print message...
}
// handle another error...

【讨论】：

这不起作用。我正在通过 AJAX 调用上传文件并将状态代码设为 500（内部错误）。在 tomcat 层抛出异常。请参阅帖子中的完整跟踪。

【解决方案2】：

你这样做：

catch (Exception e) {
    redirectAttributes.addFlashAttribute("message",
            "You failed to upload, because file size too big " + name + " => " + e.getMessage());
}

捕获异常，然后向用户的浏览器推送一条 Flash 消息：redirectAttributes.addFlashAttribute()

这是处理上传过程的官方教程（春季）：https://spring.io/guides/gs/uploading-files/

【讨论】：