Read and write compressed data from blob in ADF

Question

Hi All,
I have a requirement where i need to compress/zip the file, if the file is greater than 2MB and store in database.
And i need to extract it from database in download dialog as zip file.
Please suggest me, i m using JDev 10.1.3.5 and using inputFile component or please redirect me to any examples or demos.
Regards,
R N V Prasad

Answer 1

Hi
I am first uploading file and if the file is more than 2MB, i am compressing it. i used the below method for compressing.
public void zipFile(String inputFilePath,String outputFilePath,String outFileName){
long fileSize;
long twoMBFileSize=2097152;
String outFileLocation;
try
byte[] data = new byte[1000];
File file=new File(inputFilePath);
FileInputStream fis=new FileInputStream(file);
BufferedInputStream in = new BufferedInputStream(fis);
fileSize = file.length();
System.out.println("File size.."+fileSize);
int count;
outFileLocation=outputFilePath+outFileName;
System.out.println("outFileLocation..."+outFileLocation);
ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(outFileLocation)));
out.putNextEntry(new ZipEntry(outFileName));
while((count = in.read(data,0,1000)) != -1)
out.write(data, 0, count);
in.close();
out.flush();
out.close();
catch(Exception e)
e.printStackTrace();
And i will read the compressed file and posting to DB.
Here i am facing the problem while downloading the compressed files.
Naga