Question

我正在使用org.apache.commons.fileupload上传。

public void doPost(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {

     boolean isMultipart = ServletFileUpload.isMultipartContent(request);
     GWT.log("is multipart? " + Boolean.toString(isMultipart), null);

     ServletFileUpload upload = new ServletFileUpload();

     try{
            FileItemIterator iter = upload.getItemIterator(request);

            while (iter.hasNext()) {
                    FileItemStream item = iter.next();
                    String name = item.getFieldName();
                    InputStream stream = item.openStream() ;

                    /**
                    * Save th uploaded file
                    */

            }
     }
    catch(Exception e){
            e.printStackTrace();
    }
 }

如何保存上传的文件？

Answer 1

这看起来像服务器端代码，（除了GWT-RPC servlet之外）根本不特定于GWT。那个GWT.log()是不必要的 - 用常规的日志记录调用替换它，并像往常一样在非GWT代码中处理上传，因为它就是这样。

Here is a helpful example of using apache's fileupload to get you started

Answer 2

我认为这可以帮到你。

if (!item.isFormField()) {
    String fieldName = item.getFieldName();
    String fileName = item.getName();
    String contentType = item.getContentType();
    boolean isInMemory = item.isInMemory();
    long sizeInBytes = item.getSize();

  File saveTo = new File("/file_uploads/" + fileName);
  try {
    item.write(saveTo);
    ...
  }
  catch (Exception e){
    ...
  }

请注意，上传的文件可能已由org.apache.commons.fileupload自动保存

您可以使用

设置要保存在磁盘上或加载到内存中的文件的大小阈值

// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();

// Set factory constraints
factory.setSizeThreshold(yourMaxMemorySize);
factory.setRepository(yourTempDirectory);

// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);

// Set overall request size constraint
upload.setSizeMax(yourMaxRequestSize);

// Parse the request
List /* FileItem */ items = upload.parseRequest(request);

您需要了解的有关org.apache.commons.fileupload的所有内容均在此处：Using FileUpload

使用GWT保存上传的文件

2 个答案: