0
嗨,我是新的谷歌應用程序引擎。我通過這個tutorial使用URL在Blobstore中插入Blob
我運行這些示例項目successfully.in此我要上傳文件,然後使用這個網址我要上傳文件到Blob存儲區返回回同一file.but我已經給了一個網址然後再次下載。 任何人都可以請幫助如何通過網址上傳文件。 這裏是index.jsp文件
<%@ page import="com.google.appengine.api.blobstore.BlobstoreServiceFactory" %>
<%@ page import="com.google.appengine.api.blobstore.BlobstoreService" %>
<%
BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
%>
<html>
<head>
<title>Upload Test</title>
</head>
<body>
<form action="<%= blobstoreService.createUploadUrl("/upload") %>" method="post" enctype="multipart/form-data">
<input type="text" name="foo">
<input type="file" name="myFile">
<input type="submit" value="Submit">
</form>
</body>
</html>
這裏的代碼是serve.java代碼
package org.ritesh;
import java.io.IOException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.appengine.api.blobstore.BlobKey;
import com.google.appengine.api.blobstore.BlobstoreService;
import com.google.appengine.api.blobstore.BlobstoreServiceFactory;
public class Serve extends HttpServlet {
private BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws IOException {
BlobKey blobKey = new BlobKey(req.getParameter("blob-key"));
blobstoreService.serve(blobKey, res);
}
}
UploadServlet代碼是在這裏
package org.ritesh;
import java.io.IOException;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.appengine.api.blobstore.BlobKey;
import com.google.appengine.api.blobstore.BlobstoreService;
import com.google.appengine.api.blobstore.BlobstoreServiceFactory;
public class UploadServlet extends HttpServlet {
private BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(req);
BlobKey blobKey = blobs.get("myFile");
if (blobKey == null) {
res.sendRedirect("/");
} else {
res.sendRedirect("/serve?blob-key=" + blobKey.getKeyString());
}
}
}
它運行良好,請提出任何修改,使它通過一個URL上傳一個文件