Apache commons fileupload FileItemIterator hasNext（）返回false [英] Apache commons fileupload FileItemIterator hasNext() returns false

问题描述

我正在使用apache commons fileupload stream api。但是FileItemIterator FileItemIterator iter = upload.getItemIterator（request）; 在其hasNext（） iter.hasNext（）这是什么问题？

代码和web部分如下：

  protected void doPost（HttpServletRequest请求，HttpServletResponse响应）抛出IOException {
 
 / ** 
 *将使用Apache commons文件上传方法
 * / 
 //检查是否有文件上传请求
 boolean isMultipart = ServletFileUpload.isMultipartContent（request）; 
 $ b $ if（isMultipart）{
 try {
 //创建一个新的文件上传处理程序
 ServletFileUpload upload = new ServletFileUpload（）; 
 //解析请求
 FileItemIterator iter = upload.getItemIterator（request）; （iter.hasNext（））{
 FileItemStream item = iter.next（）; 
 
 
 String name = item.getFieldName（）; 
 InputStream stream = item.openStream（）; 
 if（item.isFormField（））{
 System.out.println（Form field+ name +with value+ Streams.asString（stream）+detected。 
} else {
 System.out.println（File field+ name +with file name+ item.getName（）+detected。）; 
 //处理输入流
 // 
} 
} 
 
} catch（FileUploadException ex）{
 Logger。 getLogger（ResourceUploadServlet.class.getName（））.log（Level.SEVERE，null，ex）; 
 
 
 $ b $ / code $ / pre 
 $ b $ jsp页面如下： / p> 
 
 
 < form action =AServletmethod =POST
 enctype =multipart / form-data> ; 
< input type =filename =Content/> 
描述：< input type =textname =Description/> 
< input type =submitvalue =Submit/> 
 
< / form> 
  
 Best， 
 
解决方案
在我的web.xml文件中。有一个过滤器 
 
 
 < filter> 
< filter-name> resourceUploadServlet< / filter-name> 
< filter-class> org.mortbay.servlet.MultiPartFilter< / filter-class> 
< init-param> 
< param-name> maxSize< / param-name> 
< param-value> 2147483648< / param-value> 
< / init-param> 
< / filter> 
  
当我删除过滤器时，问题就解决了... 
 
I'm using the apache commons fileupload stream api. But the FileItemIterator FileItemIterator iter = upload.getItemIterator(request); returns false in its hasNext() iter.hasNext() What is wrong with this?

The code and the web part is as follows:
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {

    /**
     * Apache commons file upload method will be used
     */
    // Check that we have a file upload request
    boolean isMultipart = ServletFileUpload.isMultipartContent(request);

    if (isMultipart) {
        try {
            // Create a new file upload handler
            ServletFileUpload upload = new ServletFileUpload();
            // Parse the request
            FileItemIterator iter = upload.getItemIterator(request);

            while (iter.hasNext()) {
                FileItemStream item = iter.next();
                String name = item.getFieldName();
                InputStream stream = item.openStream();
                if (item.isFormField()) {
                    System.out.println("Form field " + name + " with value " + Streams.asString(stream) + " detected.");
                } else {
                    System.out.println("File field " + name + " with file name " + item.getName() + " detected.");
                    // Process the input stream
                    //...
                }
            }

        } catch (FileUploadException ex) {
              Logger.getLogger(ResourceUploadServlet.class.getName()).log(Level.SEVERE, null, ex);

        }
    }
jsp page is as follows:
 <form action="AServlet" method="POST"
              enctype="multipart/form-data">
                            <input type="file" name="Content" />
                            Description : <input  type="text" name="Description" />
                        <input type="submit" value="Submit" />

        </form>
Best,
解决方案
In my web.xml file. There was a filter
    <filter>
        <filter-name>resourceUploadServlet</filter-name>
        <filter-class>org.mortbay.servlet.MultiPartFilter</filter-class>
        <init-param>
            <param-name>maxSize</param-name>
            <param-value>2147483648</param-value>
        </init-param>
    </filter>
When i remove the filter the problem is solved...

                        
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