I want to upload one image to the database by using Google app engine and JDO.
I got one code from the internet.
http://code.google.com/appengine/articles/java/serving_dynamic_images.html
I tried that example. But the url what I am passing to URLFetchService fetch method is throwing Malformed exception. So here what is this url value supposed to be expected.
I gave the value of url value as the file upload value from the jsp page.
Please find the code below:
package com.google.appengine.demo.domain;
import com.google.appengine.api.datastore.Blob;
import com.google.appengine.api.datastore.Key;
import javax.jdo.annotations.Extension;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;
/**
* JDO-annotated model class for storing movie properties; movie's promotional
* image is stored as a Blob (large byte array) in the image field.
*/
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Movie {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
private String title;
@Persistent
@Extension(vendorName="datanucleus", key="gae.unindexed", value="true")
private String imageType;
@Persistent
private Blob image;
public Long getId() {
return key.getId();
}
public String getTitle() {
return title;
}
public String getImageType() {
return imageType;
}
public byte[] getImage() {
if (image == null) {
return null;
}
return image.getBytes();
}
public void setTitle(String title) {
this.title = title;
}
public void setImageType(String imageType) {
this.imageType = imageType;
}
public void setImage(byte[] bytes) {
this.image = new Blob(bytes);
}
//...
}
JSP
<html>
<head>
<title>Image Upload</title>
</head>
<body>
<form action="/addMovie" method="get" enctype="multipart/form-data"
name="productForm" id="productForm">
<br>
<br>
<table width="400px" align="center" border=0
style="background-color: ffeeff;">
<tr>
<td align="center" colspan=2
style="font-weight: bold; font-size: 20pt;">Image Details</td>
</tr>
<tr>
<td align="center" colspan=2> </td>
</tr>
<tr>
<td>Image Link:</td>
<td><input type="file" name="url" ><td>
</tr>
<tr>
<td></td>
<td><input type="submit" name="Submit" value="Submit">
</td>
</tr>
<tr>
<td colspan="2"> </td>
</tr>
</table>
</form>
</body>
</html>
Servlet
package com.google.appengine.demo.web;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import javax.jdo.PersistenceManager;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import pmf.PMF;
import com.google.appengine.api.urlfetch.HTTPHeader;
import com.google.appengine.api.urlfetch.HTTPResponse;
import com.google.appengine.api.urlfetch.URLFetchService;
import com.google.appengine.api.urlfetch.URLFetchServiceFactory;
import com.google.appengine.demo.domain.Movie;
/**
* GET requests fetch the image at the URL specified by the url query string
* parameter, then persist this image along with the title specified by the
* title query string parameter as a new Movie object in App Engine's
* datastore.
*/
public class StoreMovieServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException {
PrintWriter out = response.getWriter();
try {
String url1 = request.getParameter("url");
String url ="http://localhost:8877/addMovie?url="+url1;
// url = "C:\\my_photo.jpg";
System.out.println("url:: +"+url);
URLFetchService fetchService =
URLFetchServiceFactory.getURLFetchService();
HTTPResponse fetchResponse = fetchService.fetch(new URL(
request.getParameter(url1)));
String fetchResponseContentType = null;
for (HTTPHeader header : fetchResponse.getHeaders()) {
// For each request header, check whether the name equals
// "Content-Type"; if so, store the value of this header
// in a member variable
if (header.getName().equalsIgnoreCase("content-type")) {
fetchResponseContentType = header.getValue();
break;
}
}
Movie movie = new Movie();
// movie.setTitle(req.getParameter("title"));
movie.setImageType(fetchResponseContentType);
// Set the movie's promotional image by passing in the bytes pulled
// from the image fetched via the URL Fetch service
movie.setImage(fetchResponse.getContent());
PersistenceManager pm = PMF.get().getPersistenceManager();
try {
// Store the image in App Engine's datastore
pm.makePersistent(movie);
} finally {
pm.close();
}
}catch(Exception ex){
ex.printStackTrace();
}
finally {
out.close();
}
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException {
PrintWriter out = response.getWriter();
try {
String url1 = request.getParameter("url");
String url ="http://localhost:8877/addMovie?url="+url1;
// url = "C:\\my_photo.jpg";
System.out.println("url:: +"+url);
URLFetchService fetchService =
URLFetchServiceFactory.getURLFetchService();
HTTPResponse fetchResponse = fetchService.fetch(new URL(
request.getParameter(url1)));
String fetchResponseContentType = null;
for (HTTPHeader header : fetchResponse.getHeaders()) {
// For each request header, check whether the name equals
// "Content-Type"; if so, store the value of this header
// in a member variable
if (header.getName().equalsIgnoreCase("content-type")) {
fetchResponseContentType = header.getValue();
break;
}
}
Movie movie = new Movie();
// movie.setTitle(req.getParameter("title"));
movie.setImageType(fetchResponseContentType);
// Set the movie's promotional image by passing in the bytes pulled
// from the image fetched via the URL Fetch service
movie.setImage(fetchResponse.getContent());
PersistenceManager pm = PMF.get().getPersistenceManager();
try {
// Store the image in App Engine's datastore
pm.makePersistent(movie);
} finally {
pm.close();
}
}catch(Exception ex){
ex.printStackTrace();
}
finally {
out.close();
}
}
private void storeImage(HttpServletRequest req) throws IOException,
MalformedURLException {
URLFetchService fetchService =
URLFetchServiceFactory.getURLFetchService();
// Fetch the image at the location given by the url query string parameter
HTTPResponse fetchResponse = fetchService.fetch(new URL(
req.getParameter("url")));
String fetchResponseContentType = null;
for (HTTPHeader header : fetchResponse.getHeaders()) {
// For each request header, check whether the name equals
// "Content-Type"; if so, store the value of this header
// in a member variable
if (header.getName().equalsIgnoreCase("content-type")) {
fetchResponseContentType = header.getValue();
break;
}
}
if (fetchResponseContentType != null) {
// Create a new Movie instance
Movie movie = new Movie();
movie.setTitle(req.getParameter("title"));
movie.setImageType(fetchResponseContentType);
// Set the movie's promotional image by passing in the bytes pulled
// from the image fetched via the URL Fetch service
movie.setImage(fetchResponse.getContent());
//...
PersistenceManager pm = PMF.get().getPersistenceManager();
try {
// Store the image in App Engine's datastore
pm.makePersistent(movie);
} finally {
pm.close();
}
}
}
web.xml
<servlet>
<servlet-name>StoreMovie</servlet-name>
<servlet-class>com.google.appengine.demo.web.StoreMovieServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>GetImage</servlet-name>
<servlet-class>com.google.appengine.demo.web.GetImageServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>StoreMovie</servlet-name>
<url-pattern>/addMovie</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>GetImage</servlet-name>
<url-pattern>/image</url-pattern>
</servlet-mapping>
The sample code you posted is to fetch an image from a URL , whereas your code is trying to upload an image from your filesystem.
The
<input type="file">means you are selecting this from your local system. This does not translate into a URL. You’re going to have upload this image to the App Engine and then do whatever you want with it.Here is a nice walkthrough of how to do that with the Apache Commons File Upload jars.