Google App Engine Blobstore圖像

我正在嘗試使用Blobstore創建一個簡單的Web應用程序來上傳多個圖像。我設法成功地將圖像上傳到Blobstore。但是當圖像上傳時，上傳的servlet不會重定向到任何我嘗試重定向到的頁面。它只是顯示一個空白頁面，其URL如下所示：myapplicationId.appstore.com/_ah/upload/....(keyvalue）Google App Engine Blobstore圖像

我無法更改名爲Upload的servlet重定向到另一個頁面。我也試圖服務的圖像，但無法做到這一點。

有人可以指導我。

我正在使用Java中的Google的標準代碼來上傳圖像。

我的JSP是：

<%@ page import="com.google.appengine.api.blobstore.BlobstoreServiceFactory" %> 
<%@ page import="com.google.appengine.api.blobstore.BlobstoreService" %> 
<script> 
<% 
BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService(); 

%> 

</script> 
<html> 
<head> 
<title>Show My Picture(s)</title> 
</head> 
<body> 

<h1>Show My Picture(s)</h1> 
<hr/> 
<h2>Upload picture(s)</h2> 
<form action="<%= blobstoreService.createUploadUrl("/upload") %>" method="post" enctype="multipart/form-data"> 
Upload File(s) : 
<input type="text" name="filename"/> 
<input type="file" name="myPics" multiple="multiple"/> 
<input type="submit" value="Upload Picture"/> 
</form> 
</html>

我上傳的Servlet：

package photos; 
import java.io.IOException; 
import java.io.PrintWriter; 
import java.util.Date; 
import java.util.Map; 
import java.util.logging.Logger; 

import javax.servlet.ServletException; 
import javax.servlet.annotation.WebServlet; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

import photos.Upload; 

import com.google.appengine.api.blobstore.BlobKey; 
import com.google.appengine.api.blobstore.BlobstoreService; 
import com.google.appengine.api.blobstore.BlobstoreServiceFactory; 
import com.google.appengine.api.datastore.DatastoreService; 
import com.google.appengine.api.datastore.DatastoreServiceFactory; 
import com.google.appengine.api.datastore.Entity; 
import com.google.appengine.api.datastore.KeyFactory; 
import com.google.appengine.api.images.ImagesService; 
import com.google.appengine.api.images.ImagesServiceFactory; 
import com.google.appengine.api.users.User; 
import com.google.appengine.api.users.UserService; 
import com.google.appengine.api.users.UserServiceFactory; 

/** 
* Servlet implementation class Upload 
*/ 
@WebServlet("/Upload") 
public class Upload extends HttpServlet { 
    private static final long serialVersionUID = 1L; 

    /** 
    * @see HttpServlet#HttpServlet() 
    */ 
    private final static Logger _logger = Logger.getLogger(Upload.class.getName()); 
    private BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService(); 

    public void doPost(HttpServletRequest req, HttpServletResponse res) 
    throws ServletException, IOException { 

      try{ 
      Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(req); 
      BlobKey blobKey = blobs.get("myPics"); 


      if (blobKey == null) { 
       res.sendRedirect("/"); 
      } 
      else { 
       res.sendRedirect("/upload?blob-key="+blobKey.getKeyString()+"blobSize="+blobs.size()); 
       } 
      }catch(Exception e){ 
       e.printStackTrace(); 
       System.out.println("Document failed to POST, redirecting back to upload."); 
       res.sendRedirect("/index.jsp"); 
      } 
    } 

    public void doGet(HttpServletRequest req, HttpServletResponse resp) 
      throws IOException { 

     String uploadedImageKey = req.getParameter("blob-key"); 
     PrintWriter out = resp.getWriter(); 
     resp.setHeader("Content-Type", "text/html"); 
     resp.sendRedirect("/viewPics.jsp"); 
     //out.println(req.getParameter("blobSize")+" images have been successfully uploaded"); 



    } 
}

我要去哪裏錯了？

來源

2013-12-08 Anan

我想自救是最好的幫助。我解決了這個問題。它只是將上傳更改爲在createUploadUrl中上傳。

來源

2013-12-08 06:19:34 Anan

Google App Engine Blobstore圖像

回答

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