Question

我正在尝试将文件上传到标准环境上的appengine blobstore。尝试遵循google appengine for java上的指南但是我不是使用jsp，而是使用gwt。

因此，我首先获得一个将文件发送到Appengine blobstoreService.createUploadUrl("/uploadFile")

的网址

我提交表格。

分配给路径“ / uploadFile”的servlet被调用，但是

我正在收到

java.lang.IllegalStateException: Must be called from a blob upload callback request.
    at com.google.appengine.api.blobstore.BlobstoreServiceImpl.getUploads(BlobstoreServiceImpl.java:183)
    at brandeira.morholt.web.server.Upload.doPost(Upload.java:44)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)...

我不直接调用该servlet，我所指的唯一一点是 blobstoreService.createUploadUrl("/uploadFile")

我的Gwt客户：

import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FileUpload;

final FormPanel formPanel = new FormPanel();
formPanel.setEncoding(FormPanel.ENCODING_MULTIPART);
formPanel.setMethod(FormPanel.METHOD_POST);

final FileUpload fileUpload = new FileUpload();
panel.add(fileUpload);

Button uploadButton = new Button("carregar");
uploadButton.addClickHandler(new ClickHandler() {
                @Override
                public void onClick(ClickEvent event) {
                        formPanel.submit();
                }


            });

panel.add(uploadButton);

myService.getBlobFileURL(projectName, fileName, new AsyncCallback<BlobURL>() {
            @Override
            public void onSuccess(BlobURL result) {
                formPanel.setAction(result.getUrl());
            }
            @Override
            public void onFailure(Throwable caught) {
            }
        });

在MyServiceImpl（RemoteServiceServlet）上：

public BlobURL getBlobFileURL(WebUser user) throws Exception {
     BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
    return new BlobURL(blobstoreService.createUploadUrl("/uploadFile"));
}

Upload.java：

private BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();

@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp) {

        Map<String, List<BlobKey>> uploadedBlobs = **blobstoreService.getUploads(req)**; // exception here

我的web.xml：

  <applicationContext-param>
    <param-name>maxSize</param-name>
    <param-value>2096000</param-value>
    <!-- <param-value>1024000</param-value> -->
  </applicationContext-param>

  <applicationContext-param>
    <param-name>corsDomainsRegex</param-name>
    <param-value>.*</param-value>
  </applicationContext-param>

  <servlet>
    <servlet-name>Uploada</servlet-name>
    <servlet-class>brandeira.morholt.web.server.Upload</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>Uploada</servlet-name>
    <url-pattern>/uploadFile</url-pattern>
  </servlet-mapping>

您能帮我吗？谢谢！

从Gwt客户端将文件上传到Appengine Blobstore-IllegalStateException

0 个答案: