formpanel.submit不在GWT服务器上提交文件

Question

我想从客户端发送文件到服务器.

我的代码:

客户方:

private FormPanel getFormPanel() {
    if (formPanel == null) {
        formPanel = new FormPanel();
    formPanel.setMethod(FormPanel.METHOD_POST);
        formPanel.setEncoding(FormPanel.ENCODING_MULTIPART);
        formPanel.setAction(GWT.getHostPageBaseURL() +"UploadFileServlet");
        formPanel.setWidget(getFlexTable_1());

                System.out.println(GWT.getHostPageBaseURL() +"UploadFileServlet");
    }
    return formPanel;
}

在 getFlexTable_1()

flexTable.setWidget(1, 1, getFileUpload());

在 getFileUpload()

private FileUpload getFileUpload() {
    if (fileUpload == null) {
        fileUpload = new FileUpload();
        fileUpload.setName("upload");
    }
    return fileUpload;
}

private Button getAddButton() {
        if (addButton == null) {
            addButton = new Button("ADD");
            addButton.addClickHandler(new ClickHandler() {
                public void onClick(ClickEvent event) {
                               formPanel.submit();
        }
        });
    }
return addButton;

}

在服务器端

public class CmisFileUpload extends HttpServlet implements Servlet{

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

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

        byte[] buffer = new byte[115200];//
        String fileName = null;
        String mimetype = null;
        String majorVersion = null;
        InputStream stream = null;
        System.out.println("ServletWorking Fine");
}

现在,当我选择一个文件并单击"添加"按钮时,我无法在服务器端看到此代码的输出 System.out.println("ServletWorking Fine");

System.out.println(GWT.getHostPageBaseURL() +"UploadFileServlet");客户端的outPut 是

http://127.0.0.1:8888/UploadFileServlet

当我直接在浏览器上使用此URL时,我获得System.out.println("ServletWorking Fine");**的服务器端输出

---

编辑

我创建了另一个用于文件上传的Web应用程序

public class Uploadfile implements EntryPoint {

    FormPanel uploadForm = new FormPanel();
    public void onModuleLoad() {

        HorizontalPanel horizontalPanel = new HorizontalPanel();

      uploadForm.setAction(GWT.getHostPageBaseURL() +"UploadFileServlet"); 

        uploadForm.setEncoding(FormPanel.ENCODING_MULTIPART); 
        uploadForm.setMethod(FormPanel.METHOD_POST); 
        horizontalPanel.add(uploadForm);

        // Create a panel to hold all of the form widgets. 
        VerticalPanel panel = new VerticalPanel(); 
        uploadForm.setWidget(panel); 

        FlexTable flexTable = new FlexTable();
        panel.add(flexTable);

        // Create a FileUpload widget. 
        FileUpload upload = new FileUpload(); 
        upload.setName("uploadFormElement"); 
        flexTable.setWidget(2, 3, upload);
        // panel.add(upload); 

        // Add a 'submit' button. 
        Button uploadSubmitButton = new Button("Submit"); 
        panel.add(uploadSubmitButton); 

        uploadSubmitButton.addClickHandler(new ClickHandler() {

            public void onClick(ClickEvent event) {
                // TODO Auto-generated method stub
                 uploadForm.submit(); 
            }
        });
        uploadForm.addFormHandler(new FormHandler() { 
          public void onSubmit(FormSubmitEvent event) { 
          } 
          public void onSubmitComplete(FormSubmitCompleteEvent event) { 
            Window.alert(event.getResults()); 
          } 
        }); 
        RootPanel.get().add(horizontalPanel); 
    }
}

服务器

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

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

      System.out.println("working fine" );
   }

这段代码工作正常

据我所知,代码之间没有区别.

Plz告诉我为什么formpanel.submit不能正常工作.

Plz的帮助.

Answer 1

被hide()方法正在关闭窗口??? 如果是的话

除去移动代码hide();后formPanel.submit();

对于hide()使用FormHandler.例如

uploadForm.addFormHandler(new FormHandler() {

    public void onSubmitComplete(FormSubmitCompleteEvent event) {
        hide();
    }

    public void onSubmit(FormSubmitEvent event) {

    }

});

原因:FormPanel不得分离(即在提交完成之前将其从父项中删除.否则,提交通知将失败.