6
Projem sadece basit bir dosya yükleme formu ve onu görüntülemek için yönlendirme içerir. 50 KB'den küçük dosyalar yükleyebilirim ancak 100 KB'den büyük bazı dosyaları yüklediğimde, uygulama motorundan IO İstisnası atar. Sorunun nerede olduğundan emin değilim. Google Cloud depolama alanına yükleyebileceğim dosya boyutunu, uygulama motorunda form yayınlama yoluyla nasıl artıracağını bilen var mı? Dosya boyutu 10 MB'den az uygun değil. Herhangi bir kod parçacığı vhighly takdir edilecektir. Teşekkür ederim. Neden uygulama motoru aracılığıyla 100KByte'den büyük dosya Google Cloud Storage'e yükleyemiyorum?
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)
ardından
benim kodudur: 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>