I am trying to upload a file to Google Cloud Storage. My Servlet code is
public class UploadFile extends HttpServlet {
private final String BUCKET = "XXXXXXXXX";
private boolean isMultipart;
private String filePath;
private int maxFileSize = 5 * 1024 * 1024;
private int maxMemSize = 5 * 1024 * 1024;
private File file ;
public void init( ){
// Get the file location where it would be stored.
filePath =
getServletContext().getInitParameter("file-upload");
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException {
// Check that we have a file upload request
isMultipart = ServletFileUpload.isMultipartContent(request);
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter( );
if( !isMultipart ){
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
out.println("<p>No file uploaded</p>");
out.println("</body>");
out.println("</html>");
return;
}
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(maxMemSize);
// Location to save data that is larger than maxMemSize.
factory.setRepository(new File("/temp/image/"));
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum file size to be uploaded.
upload.setSizeMax( maxFileSize );
try{
// Parse the request to get file items.
List fileItems = upload.parseRequest(request);
// Process the uploaded file items
Iterator i = fileItems.iterator();
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
while ( i.hasNext () )
{
FileItem fi = (FileItem)i.next();
if ( !fi.isFormField () )
{
// Get the uploaded file parameters
String fieldName = fi.getFieldName();
String fileName = fi.getName();
String contentType = fi.getContentType();
boolean isInMemory = fi.isInMemory();
long sizeInBytes = fi.getSize();
// Write the file
if( fileName.lastIndexOf("\\") >= 0 ){
file = new File( filePath +
fileName.substring( fileName.lastIndexOf("\\"))) ;
}else{
file = new File( filePath +
fileName.substring(fileName.lastIndexOf("\\")+1)) ;
}
String path = Events.uploadFile ( fileName, "image/*", file, BUCKET );
// fi.write( file ) ;
out.println("Uploaded Filename: " + fileName + "<br>"+ " File Path:"+ path);
}
}
out.println("</body>");
out.println("</html>");
}catch(Exception ex) {
System.out.println(ex);
}
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException {
throw new ServletException("GET method used with " +
getClass( ).getName( )+": POST method required.");
}
}
web.xml
<servlet>
<servlet-name>UploadFile</servlet-name>
<servlet-class>XXXXXXXXXX.UploadFile</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UploadFile</servlet-name>
<url-pattern>/uploadManager/UploadFile</url-pattern> //Based on your original URL
</servlet-mapping>
fileUpload function to save file to GCS
public static String uploadFile ( String name, String contentType, File file, String bucketName )
throws IOException, GeneralSecurityException
{
InputStreamContent contentStream = new InputStreamContent ( contentType, new FileInputStream ( file ) );
// Setting the length improves upload performance
contentStream.setLength ( file.length () );
StorageObject objectMetadata = new StorageObject ()
// Set the destination object name
.setName ( name )
// Set the access control list to publicly read-only
.setAcl ( Arrays.asList ( new ObjectAccessControl ().setEntity ( "allUsers" ).setRole ( "READER" ) ) );
// Do the insert
Storage client = StorageFactory.getService ();
Storage.Objects.Insert insertRequest = client.objects ().insert ( bucketName, objectMetadata, contentStream );
insertRequest.execute ();
return "https://storage.cloud.google.com/" + BUCKET + "/" + file.getName ();
}
But when i try to test this with some API testing client it gives error
org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found
Further after integrating it with UI which is in Angular and testing it locally, i am facing this issue
Cross-Origin Request Blocked Reason: CORS header 'Access-Control-Allow-Origin' missing
I tried to resolve this issue but found no solution corresponding to google appengine.
Initially i am trying to upload a image through this code but in near future same code is to be used to upload .pdf and .html files to GCS.
For reference: I am using Google Endpoints for my other data communication needs with client end. Client End is a webapp build in Angular but it will be extended to android and ios.
Any help will be appreciated.
Thank You
UPDATE 1/8/2016
Now i am getting file on server but i don't know where i have to temporarily save the file before sending it to Google Cloud Storage. On storing file in
war\WEB-INI\
and exception i am facing is
java.security.AccessControlException: access denied ("java.io.FilePermission" "\war\WEB-INI\profile.png" "read")
