commons-fileupload中断上传的异常如何处理？
我在使用swfupload和fileupload共同完成文件的上传功能
因为提供了可以中断上传的功能，但是在中断的同时会抛出异常

org.apache.commons.fileupload.FileUploadBase$IOFileUploadException: Processing of multipart/form-data request failed. Stream ended unexpectedly
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:359)
at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
at com.sini.utils.upload.UploadServlet.doPost(UploadServlet.java:43)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.commons.fileupload.MultipartStream$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(Unknown Source)
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


异常的意思是以不希望的情况结束了流（Stream）

Java code

// 创建工厂
        DiskFileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);

        // 设置文件上传大小（单位KB）
        upload.setSizeMax(-1);

        try {
            List items = upload.parseRequest(request);
            Iterator it = items.iterator();
            // 循环取出表单中元素
            while (it.hasNext()) {
                FileItem item = (FileItem) it.next();
                // 如果是FormField，则获取文件的名称并上传，否则打印表单信息
                if (item.isFormField()) { // 不是文件域
                    String postName = item.getFieldName(); // 参数名
                    if("username".equals(postName)){
                        System.out.println("用户名是："+item.getString()); // 参数值
                    }else if("userid".equals(postName)){
                        System.out.println("用户id是："+item.getString());
                    }
                } else { // 当是文件域的时候，执行上传写入硬盘操作
                    
                    File temp = new File(item.getName());
                    
                    System.out.println("文件名为："+item.getName());
                    
                    String path = request.getSession().getServletContext().getRealPath("/upload/");
                    
                    File file = new File(