6
मेरी प्रोजेक्ट में केवल सरल फ़ाइल अपलोड फॉर्म और इसे देखने के लिए रीडायरेक्ट है। मैं 50 KB से कम की किसी भी फाइल को अपलोड कर सकता हूं लेकिन जब मैं 100 KB से बड़ी फ़ाइलों को अपलोड करता हूं, तो यह ऐप इंजन से आईओ अपवाद फेंकता है। मुझे यकीन नहीं है कि समस्या कहां है। क्या किसी को पता है कि फ़ाइल आकार को कैसे बढ़ाया जाए जिसे मैं Google क्लाउड स्टोरेज में ऐप इंजन में फॉर्म पोस्टिंग के माध्यम से अपलोड कर सकता हूं? 10 एमबी से कम फ़ाइल आकार ठीक है ठीक है। किसी भी कोड स्निपेट की सराहना की जाएगी। धन्यवाद।मैं Google क्लाउड स्टोरेज में फ़ाइल अपलोड क्यों नहीं कर सकता जो कि ऐप इंजन के माध्यम से 100KByte से बड़ा है?
java.io.IOException
at com.google.appengine.api.files.FileServiceImpl.translateException(FileServiceImpl.java:615)
at com.google.appengine.api.files.FileServiceImpl.makeSyncCall(FileServiceImpl.java:588)
at com.google.appengine.api.files.FileServiceImpl.append(FileServiceImpl.java:535)
at com.google.appengine.api.files.FileServiceImpl.append(FileServiceImpl.java:289)
at com.google.appengine.api.files.FileWriteChannelImpl.write(FileWriteChannelImpl.java:57)
at com.google.appengine.api.files.FileWriteChannelImpl.write(FileWriteChannelImpl.java:46)
at java.nio.channels.Channels.write(Channels.java:80)
at java.nio.channels.Channels.access$000(Channels.java:64)
at java.nio.channels.Channels$1.write(Channels.java:151)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
at storefile.StorageService.storeFile(StorageService.java:46)
at storefile.UploadServlet.doPost(UploadServlet.java:46)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
के बाद मेरी कोड है: upload.html
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Hello App Engine</title>
</head>
<body>
<h1>Hello App Engine!</h1>
<form action="/upload" method="post" enctype="multipart/form-data">
<p>File<input type="file" name="file" /> </p>
<p> <input type="submit"value="upload" /> <input type="reset" value="reset"/> </p>
</form>
</body>
</html>
uploadServlet.java
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.google.appengine.api.blobstore.BlobKey;
public class UploadServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
private StorageService storage = new StorageService();
private static int BUFFER_SIZE =1024 * 1024* 10;
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
resp.setContentType("text/plain");
resp.getWriter().println("Now see here your file content, that you have uploaded on storage..");
ServletFileUpload upload = new ServletFileUpload();
FileItemIterator iter;
try {
iter = upload.getItemIterator(req);
while (iter.hasNext()) {
FileItemStream item = iter.next();
String fileName = item.getName();
String mime = item.getContentType();
storage.init(fileName, mime);
InputStream is = new BufferedInputStream(item.openStream());
byte[] b = new byte[BUFFER_SIZE];
int readBytes = is.read(b, 0, BUFFER_SIZE);
while (readBytes != -1) {
storage.storeFile(b, readBytes);
readBytes = is.read(b, 0, readBytes);
}
is.close();
storage.destroy();
resp.getWriter().println("File uploading done");
// resp.getWriter().println("READ:" + storage.readTextFileOnly(fileName));
BlobKey key = storage.getBlobkey(fileName);
if (key != null) {
resp.sendRedirect("/serve?blob-key=" + key.getKeyString());
} else {
resp.sendRedirect("/");
}
}
} catch (Exception e) {
e.printStackTrace(resp.getWriter());
System.out.println("Exception::"+e.getMessage());
e.printStackTrace();
}
}
}
StorageService.java
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.nio.channels.Channels;
import java.util.logging.Logger;
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.files.AppEngineFile;
import com.google.appengine.api.files.FileReadChannel;
import com.google.appengine.api.files.FileService;
import com.google.appengine.api.files.FileServiceFactory;
import com.google.appengine.api.files.FileWriteChannel;
import com.google.appengine.api.files.GSFileOptions.GSFileOptionsBuilder;
public class StorageService {
public static final String BUCKET_NAME = "aaaa";
private FileWriteChannel writeChannel = null;
FileService fileService = FileServiceFactory.getFileService();
private BufferedOutputStream bos = null;
private static final Logger log = Logger.getLogger(StorageService.class.getName());
private BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
public void init(String fileName, String mime) throws Exception {
System.out.println("Storage service:init() method: file name:"+fileName+" and mime:"+mime);
log.info("Storage service:init() method: file name:"+fileName+" and mime:"+mime);
GSFileOptionsBuilder builder = new GSFileOptionsBuilder()
.setAcl("public_read")
.setBucket(BUCKET_NAME)
.setKey(fileName)
.setMimeType(mime);
AppEngineFile writableFile = fileService.createNewGSFile(builder.build());
boolean lock = true;
writeChannel = fileService.openWriteChannel(writableFile, lock);
bos = new BufferedOutputStream(Channels.newOutputStream(writeChannel));
}
public void storeFile(byte[] b, int readSize) throws Exception {
bos.write(b,0,readSize);
bos.flush();
}
public void destroy() throws Exception {
log.info("Storage service: destroy() method");
bos.close();
writeChannel.closeFinally();
}
public BlobKey getBlobkey (String filename) {
BlobKey bk = blobstoreService.createGsBlobKey("/gs/aaaa/"+filename);
return bk;
}
}
fileserve.java
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 fileserve 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);
}
}
web.xml
<?xml version="1.0" encoding="utf-8" standalone="no"?><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>upload</servlet-name>
<servlet-class>storefile.UploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>upload</servlet-name>
<url-pattern>/upload</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>serve</servlet-name>
<servlet-class>storefile.fileserve</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>serve</servlet-name>
<url-pattern>/serve</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>