0

我希望该客户在他的计算机上搜索一个 txt 文件，然后将其导入。这是一个包含此站点首选项的文件。我已经用 FileUpload 完成了，但我有一个错误：

javax.servlet.ServletException: Content-Type was 'multipart/form-data; boundary=---------------------------14895149261880284533914609527'. Expected 'text/x-gwt-rpc'.

我到处搜索，什么都没有……还有其他方法可以导入吗？或者我做错了什么。这是我的代码：

final DialogBox dialogBox = new DialogBox();
    dialogBox.setAnimationEnabled(true);
    dialogBox.setVisible(true);
    dialogBox.center();
    dialogBox.setText("Load settings file");    

    final FormPanel form = new FormPanel();
    form.setEncoding(FormPanel.ENCODING_MULTIPART);
    form.setMethod(FormPanel.METHOD_POST);
    form.addStyleName("loadSettingsfile");
    form.setWidth("275px");
    form.setAction(GWT.getModuleBaseURL()+"fileUpload");


    VerticalPanel holder = new VerticalPanel();

    final FileUpload upload = new FileUpload();
    upload.setName("upload");
    holder.add(upload);
    holder.add(new HTML("<hr />"));

    holder.setHorizontalAlignment(HasAlignment.ALIGN_RIGHT);

    HorizontalPanel hrPan = new HorizontalPanel();

    Button submitButton = new Button("Load settings");
    Button cancelButton = new Button("Cancel");

    hrPan.add(cancelButton);
    hrPan.add(submitButton);
    holder.add(hrPan);

    form.add(holder);

    submitButton.addClickHandler(new ClickHandler() {

        public void onClick(ClickEvent event) {
            form.submit();
        }
    });

    cancelButton.addClickHandler(new ClickHandler() {

        public void onClick(ClickEvent event) {
            dialogBox.hide();   
        }
    });

    form.addSubmitCompleteHandler(new SubmitCompleteHandler() {

        public void onSubmitComplete(SubmitCompleteEvent event) {

                //Window.alert(event.getResults());

                dialogBox.hide();   
        }
    });

    form.addSubmitHandler(new SubmitHandler() {

        public void onSubmit(SubmitEvent event) {

        }
    });



    dialogBox.setWidget(form);

和小服务程序：

public class FileUpload extends HttpServlet {

public void doPost(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {
    ServletFileUpload upload = new ServletFileUpload();
    response.setContentType("text/x-gwt-rpc");

    response.addHeader("Path", request.getPathInfo());
    try{
        FileItemIterator iter = upload.getItemIterator(request);

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

            String name = item.getFieldName();
            InputStream stream = item.openStream();

            // Process the input stream
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            int len;
            byte[] buffer = new byte[8192];
            while ((len = stream.read(buffer, 0, buffer.length)) != -1) {
                out.write(buffer, 0, len);
            }

            int maxFileSize = 10*(1024*1024); //10 megs max 
            if (out.size() > maxFileSize) { 
                throw new RuntimeException("File is > than " + maxFileSize);
            }
        }
    }
    catch(Exception e){
        throw new RuntimeException(e);
    }

}
4

0 回答 0