jspsmartupload 的示例代码，我放到 Action 里就出问题

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jspsmartupload 的示例代码，我放到 Action 里就出问题5

异常：
at com.jspsmart.upload.Files.getFile(Files.java:73)
at com.wen.struts.action.ZfAction.execute(ZfAction.java:74)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:619)

action的 execuse:
SmartUpload mySmartUpload =new SmartUpload();
long file_size_max=4000000;
String fileName2="",ext="",testvar="";
String url="fileupload/";
//应保证在根目录中有此目录的存在
//初始化
JspFactory _jspxFactory = null;
PageContext pageContext = null;
   _jspxFactory = JspFactory.getDefaultFactory();
pageContext = _jspxFactory.getPageContext(getServlet(), request, response, "", true, 8192, true);
mySmartUpload.initialize(pageContext);
//只允许上载此类文件
mySmartUpload.setAllowedFilesList("doc");
//上载文件
   mySmartUpload.upload();
   com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(0);//抛的异常
   if (myFile.isMissing()){
     }else{
   //
   String myFileName=myFile.getFileName();
    //取得上载的文件的文件名
    ext= myFile.getFileExt();
     //取得后缀名
     int file_size=myFile.getSize();
     //取得文件的大小
     String saveurl="";if(file_size<file_size_max){
     //更改文件名，取得当前上传时间的毫秒数值
     String filename = dto.getId().toString();
      saveurl=request.getRealPath("/")+url;
      saveurl+=filename+"."+ext;
       //保存路径
       myFile.saveAs(saveurl,SmartUpload.SAVE_PHYSICAL);
       String ret = "parent.HtmlEdit.focus();";
       ret += "var range = parent.HtmlEdit.document.selection.createRange();" ;
       ret += "range.pasteHTML('<img src=\"" + request.getContextPath() + "/fileupload/" + filename + "." + ext + "\">');" ;
       ret += "alert('上传成功！');";
       ret += "window.location='upload.htm';";
     } }

JSP 页面我已经用了
<html:form action="zf" method="post" target="_self" enctype="multipart/form-data">

问题补充：没有用spring ，我发现了个更好的方法，就是用struts的 html:file 的标签来处理文件上传。

Java综合