public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
String fileName = null;
long startTime, endTime;
String fileContentToDisplay = req.getParameter("FileToDisplay");
res.getWriter().println("File conetent to be displayed : " + fileContentToDisplay);
startTime = System.currentTimeMillis();
// Find if the file is in memcache. If present there is no need to go to blobstore to get the
// data
MemcacheService mService = MemcacheServiceFactory.getMemcacheService();
AppEngineFile readableFile;
readableFile = (AppEngineFile) mService.get(fileName);
if (readableFile != null) {
FileService fService = FileServiceFactory.getFileService();
res.getWriter().println("File " + fileName + " is present in cache");
FileReadChannel readChannel = fService.openReadChannel(readableFile, false);
BufferedReader reader = new BufferedReader(Channels.newReader(readChannel, "UTF8"));
String line = null;
res.getWriter().println("Contents of the file: ");
while ((line = reader.readLine()) != null) {
res.getWriter().println(line + "<br>");
}
readChannel.close();
} else // Search for the file in blob
{
List<BlobInfo> blobToRead = new LinkedList<BlobInfo>();
Iterator<BlobInfo> blobIterator = new BlobInfoFactory().queryBlobInfos();
while (blobIterator.hasNext()) blobToRead.add(blobIterator.next());
res.setContentType("text/plain");
Boolean filePresent = false;
int i;
for (i = 0; i < blobToRead.size(); i++) {
fileName = blobToRead.get(i).getFilename();
if (fileName.equals(fileContentToDisplay)) {
FileService fService = FileServiceFactory.getFileService();
res.getWriter().println("File " + fileName + " is present in the blob store");
readableFile = fService.getBlobFile(blobToRead.get(i).getBlobKey());
FileReadChannel readChannel = fService.openReadChannel(readableFile, false);
BufferedReader reader = new BufferedReader(Channels.newReader(readChannel, "UTF8"));
String line = null;
res.getWriter().println("printing the contents : ");
while ((line = reader.readLine()) != null) {
res.getWriter().println(line);
}
readChannel.close();
} else {
res.getWriter().println("File " + fileName + " is not present in the blob store");
}
}
}
endTime = System.currentTimeMillis();
res.getWriter().println("Time taken for the operation is " + (endTime - startTime) + " ms");
}
