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一：首先看一下程序执行中出现的对应报错信息，如下所示：
[WARN ] 2015-03-03 15:31:11 :Unable to parse request org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (78871114) exceeds the configured maximum (52428800) at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:937) at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:331) at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:351) at org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest.parseRequest(JakartaMultiPartRequest.java:151) at org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest.processUpload(JakartaMultiPartRequest.java:90) at org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest.parse(JakartaMultiPartRequest.java:80) at org.apache.struts2.dispatcher.multipart.MultiPartRequestWrapper.<init>(MultiPartRequestWrapper.java:75) at org.apache.struts2.dispatcher.Dispatcher.wrapRequest(Dispatcher.java:740) at org.apache.struts2.dispatcher.ng.PrepareOperations.wrapRequest(PrepareOperations.java:131) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:83) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.frame.action.ChineseFilter.doFilter(ChineseFilter.java:66) 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:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) [WARN ] 2015-03-03 15:31:11 :Could not find token name in params.
类似的问题相信很多人都遇到过，也晓得如何解决，我这里记录下来也是为了让自己对这个问题理解的更好一点，当然，我下面记录的情况都是在我的机器上实际都试验了的，下面是我根据自己的实验以及网上的相关资料的小结。
二：限制Struts2文件上传的三种情况
1：Struts2对应的配置文件中的配置的限制
struts.multipart.maxSize=上传文件的最大值（单位是字节）这个配置是控制整个项目一次性上传的文件的最大值！如果实际上传的文件超过了此配置的大小那么就会报 org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (78871114) exceeds the configured maximum (52428800)，这个异常信息！
这个配置有对应的默认值，如果不设置则使用默认的设置（针对我自己的项目这个默认配置的所在位置是：struts2-core-2.3.1.2.jar包中的org\apache\struts2\default.properties文件中）struts.multipart.maxSize=2097152，代表默认上传的文件最大值是2M，如果我们想修改它也是很容易的，有以下两种方式：
1）在struts.properties文件中配置，比如：struts.multipart.maxSize=52428800 （代表上传的文件的最大值是50M）
2）在struts.xml文件中配置，比如：<constant name="struts.multipart.maxSize" value="52428800"/>（也代表上传的文件的最大值是50M）
2：Struts2对应的文件上传的拦截器的限制
<interceptor-ref name="fileUpload"> <param name="maximumSize">52428800</param> </interceptor-ref>
这种方式是限制特定的Action的一种方式，当然她是在满足第一种情况下才起作用的，换言之，这里的配置要小于第一种情况的设置才能起到对应的作用！
需要注意的是，拦截器的使用以及和第一种文件上传之间的配合，情况如下（下面的代码仅仅是事例代码而已）：
2-1：没有拦截器的情况，仅第一种限制起作用
<action name="fileUpload" class="fileUploadAction" method="fileUpload"> </action>
2-2：仅使用默认的拦截器的情况，和2-1的效果一样，它们两个的本质是一样的，因为Struts2会每个Action加入一个默认的拦截器，显示说明与否皆可！
<action name="fileUpload" class="fileUploadAction" method="fileUpload"> <interceptor-ref name="defaultStack"></interceptor-ref> </action>
2-3：仅使用文件上传的拦截器的情况，第一种限制起作用，第二种限制也有效果，不过这种使用拦截器的方式是有问题的，这里仅仅使用了文件上传的拦截器而已，导致数据信息的丢失！当实际上传的文件大于拦截器的配置的时候，会报（[WARN ] 2015-03-03 18:49:44 :File too large: fileUploadModel.upload "test.png" "upload_6e4dba7d_14be260bb68__7fe3_00000018.tmp" 11185361）不过程序会继续的执行！
<action name="fileUpload" class="fileUploadAction" method="fileUpload"> <interceptor-ref name="fileUpload"> <param name="maximumSize">10485760</param> </interceptor-ref> </action>
2-4：先使用文件上传的拦截器，再使用默认的拦截器的情况，第一种限制起作用，第二种限制也起作用，并且当实际上传的文件的大小超过拦截器的限制时，程序会报错（[WARN ] 2015-03-03 18:53:30 :File too large: fileUploadModel.upload "test.png" "upload_53477faa_14bdea02616__7fef_00000008.tmp" 11185361）且程序会终止执行（调试的结果显示没有进入相应的Action类中）！
<action name="fileUpload" class="fileUploadAction" method="fileUpload"> <interceptor-ref name="fileUpload"> <param name="maximumSize">10485760</param> </interceptor-ref> <interceptor-ref name="defaultStack"></interceptor-ref> </action>
2-5：先使用默认的拦截器，再使用文件上传的拦截器的情况，第一种限制起作用，第二种限制也起作用，不过当超过拦截器的限制时，程序会报错（[WARN ] 2015-03-03 18:58:30 :File too large: fileUploadModel.upload "test.png" "upload_53477faa_14bdea02616__7fef_00000008.tmp" 11185361）不过仍继续的执行！
<action name="fileUpload" class="fileUploadAction" method="fileUpload"> <interceptor-ref name="defaultStack"></interceptor-ref> <interceptor-ref name="fileUpload"> <param name="maximumSize">10485760</param> </interceptor-ref> </action>
3：上传文件的最大限制
文件上传的最大值应<2G，无论前面两项配置的是多大，当实际上传的文件大小大于2G的时候就会出现如下图的情况：
针对这个情况，我还不明白是什么原因引起的，如果有清楚的请告知一下，非常感谢！
三：对应的源码的情况
第一种限制对应的关键性源码（位置：commons-fileupload-1.2.2.jar包下\org\apache\commons\fileupload\FileUploadBase.java）
FileItemIteratorImpl(RequestContext ctx) throws FileUploadException, IOException { if (ctx == null) { throw new NullPointerException("ctx parameter"); } String contentType = ctx.getContentType(); if ((null == contentType) || (!contentType.toLowerCase().startsWith("multipart/"))) { throw new FileUploadBase.InvalidContentTypeException("the request doesn‘t contain a multipart/form-data or multipart/mixed stream, content type header is " + contentType); } InputStream input = ctx.getInputStream(); if (FileUploadBase.this.sizeMax >= 0L) { int requestSize = ctx.getContentLength(); if (requestSize == -1) input = new LimitedInputStream(input, FileUploadBase.this.sizeMax, FileUploadBase.this) { private final FileUploadBase val$this$0; protected void raiseError(long pSizeMax, long pCount) throws IOException { FileUploadException ex = new FileUploadBase.SizeLimitExceededException("the request was rejected because its size (" + pCount + ") exceeds the configured maximum" + " (" + pSizeMax + ")", pCount, pSizeMax); throw new FileUploadBase.FileUploadIOException(ex); } }; //看这里
else if ((FileUploadBase.this.sizeMax >= 0L) && (requestSize > FileUploadBase.this.sizeMax)) { throw new FileUploadBase.SizeLimitExceededException("the request was rejected because its size (" + requestSize + ") exceeds the configured maximum (" + FileUploadBase.this.sizeMax + ")", requestSize, FileUploadBase.this.sizeMax); } } String charEncoding = FileUploadBase.this.headerEncoding; if (charEncoding == null) { charEncoding = ctx.getCharacterEncoding(); } this.boundary = FileUploadBase.this.getBoundary(contentType); if (this.boundary == null) { throw new FileUploadException("the request was rejected because no multipart boundary was found"); } this.notifier = new MultipartStream.ProgressNotifier(FileUploadBase.this.listener, ctx.getContentLength()); this.multi = new MultipartStream(input, this.boundary, this.notifier); this.multi.setHeaderEncoding(charEncoding); this.skipPreamble = true; findNextItem(); }
第二种限制对应的关键性源码（位置：struts2-core-2.3.1.2.jar包下\org\apache\struts2\interceptor\FileUploadInterceptor.java）
protected boolean acceptFile(Object action, File file, String filename, String contentType, String inputName, ValidationAware validation, Locale locale) { boolean fileIsAcceptable = false; if (file == null) { String errMsg = getTextMessage(action, "struts.messages.error.uploading", new Object[] { inputName }, locale); if (validation != null) { validation.addFieldError(inputName, errMsg); } if (LOG.isWarnEnabled()) LOG.warn(errMsg, new String[0]); } //看这里
else if ((this.maximumSize != null) && (this.maximumSize.longValue() < file.length())) { String errMsg = getTextMessage(action, "struts.messages.error.file.too.large", new Object[] { inputName, filename, file.getName(), "" + file.length() }, locale); if (validation != null) { validation.addFieldError(inputName, errMsg); } if (LOG.isWarnEnabled()) LOG.warn(errMsg, new String[0]); } else if ((!this.allowedTypesSet.isEmpty()) && (!containsItem(this.allowedTypesSet, contentType))) { String errMsg = getTextMessage(action, "struts.messages.error.content.type.not.allowed", new Object[] { inputName, filename, file.getName(), contentType }, locale); if (validation != null) { validation.addFieldError(inputName, errMsg); } if (LOG.isWarnEnabled()) LOG.warn(errMsg, new String[0]); } else if ((!this.allowedExtensionsSet.isEmpty()) && (!hasAllowedExtension(this.allowedExtensionsSet, filename))) { String errMsg = getTextMessage(action, "struts.messages.error.file.extension.not.allowed", new Object[] { inputName, filename, file.getName(), contentType }, locale); if (validation != null) { validation.addFieldError(inputName, errMsg); } if (LOG.isWarnEnabled()) LOG.warn(errMsg, new String[0]); } else { fileIsAcceptable = true; } return fileIsAcceptable; }
四：参考的网络资源如下
1）Struts2文件上传大小限制相关
http://www.cnblogs.com/highriver/archive/2011/06/01/2065557.html
http://www.cnblogs.com/forlina/archive/2011/09/08/2171404.html
http://www.docin.com/p-633913742.html
2）Struts2拦截器相关
http://struts2.group.iteye.com/group/wiki/1397-deep-into-struts2-interceptors
http://www.open-open.com/lib/view/open1338339244354.html
http://blog.csdn.net/qjyong/article/details/1824607
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原文地址：http://www.cnblogs.com/godtrue/p/4311486.html
