使用swfupload上传文件，停止，删除异常

先贴异常代码：

org.apache.commons.fileupload.FileUploadBase$IOFileUploadException: Processing of multipart/form-data request failed. Stream ended unexpectedly
 at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:359)
 at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
 at com.liqi.servlet.UploadServlet.doPost(UploadServlet.java:48)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
 at java.lang.Thread.run(Thread.java:595)
Caused by: org.apache.commons.fileupload.MultipartStream$MalformedStreamException: Stream ended unexpectedly
 at org.apache.commons.fileupload.MultipartStream$ItemInputStream.makeAvailable(MultipartStream.java:964)
 at org.apache.commons.fileupload.MultipartStream$ItemInputStream.read(MultipartStream.java:887)
 at java.io.InputStream.read(InputStream.java:89)
 at org.apache.commons.fileupload.util.Streams.copy(Streams.java:94)
 at org.apache.commons.fileupload.util.Streams.copy(Streams.java:64)
 at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:354)
 ... 16 more
使用swfupload组件支持停止，删除的功能，后台报流中断异常，现需要牛人们帮忙解决一下，感激不尽。