Question

我使用GWT开发Web应用程序，我正在尝试上传文件。我的servlet运行正常。

但是当我使用DiskFileItemFactory（）时，它给了我错误。

如果有人可以更正我的代码或告诉代码中缺少什么。

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

         response.setContentType("text/plain"); 
        FileItem uploadItem = getFileItem(request); 
        if (uploadItem == null) { 
          response.getWriter().write("NO-SCRIPT-DATA"); 
          return; 
        } 
        byte[] fileContents = uploadItem.get(); 
        //TODO: add code to process file contents here. We will just print 

                    response.getWriter().write(new String(fileContents)); 
}

private FileItem getFileItem(HttpServletRequest request) {
    // TODO Auto-generated method stub
    FileItemFactory factory = new DiskFileItemFactory(); 
    ServletFileUpload upload = new ServletFileUpload(factory); 
    try { 
      List items = upload.parseRequest(request); 
      Iterator it = items.iterator(); 
      while (it.hasNext()) { 
        FileItem item = (FileItem) it.next(); 
        if (!item.isFormField() 
            && "uploadForm".equals(item.getFieldName())) { 
          return item; 
        } 
      } 
    } catch (FileUploadException e) { 
      return null; 
    } 
    return null;
}

ERROR

 java.lang.NoClassDefFoundError: java.rmi.server.UID is a restricted class. Please see the Google  App Engine developer's guide for more details.
at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
at org.apache.commons.fileupload.disk.DiskFileItem.<clinit>(DiskFileItem.java:109)
at org.apache.commons.fileupload.disk.DiskFileItemFactory.createItem(DiskFileItemFactory.java:199)
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:361)
at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
at com.server.FileUpload.getFileItem(FileUpload.java:101)
at com.server.FileUpload.doPost(FileUpload.java:48)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)

编辑：工作代码

    try {
            ServletFileUpload upload = new ServletFileUpload();
            response.setContentType("text/plain"); 


            FileItemIterator iterator = upload.getItemIterator(request);

            while (iterator.hasNext()) {
                FileItemStream item = iterator.next();

                InputStream stream = item.openStream();

                if (item.isFormField()) {
                    log.warning("Got a form field: " + item.getFieldName()  + " " +item);



                } else{
                    log.warning("Got an uploaded file: " + item.getFieldName() +
                              ", name = " + item.getName());
                    int len;
                    byte[] buffer = new byte[8192];
                    while ((len = stream.read(buffer, 0, buffer.length)) != -1) {

                      response.getOutputStream().write(buffer, 0, len);

                    }

                }

            }
    } catch (FileUploadException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Answer 1

您无法在GAE中使用RMI - 如果您想要类似的内容，请查看this question。

但是从您的代码来看，您似乎根本不需要使用RMI - 为什么要使用它？你不是只是将它处理并存储在某个地方吗？

如果要存储大文件（最多32MB），请使用Blobstore API。

如果您知道自己只有<1MB的文件，则可以使用JDO / JPA和包含Entity的普通Blob存储它们 - 此选项也可让您轻松预存 - 处理数据。

java.lang.NoClassDefFoundError：java.rmi.server.UID是一个受限制的类

1 个答案: