Downloading TarGz file

[gopi gakkam]

i am calling createTarGzArchive and paasing list contails 4 XML files path. I have written below method for creating TarGZ byte array.

public static byte[] createTarGzArchive(List compressedFileList) throws ContextException {

ByteArrayOutputStream byteArrayOutputStream = null;
File compressedFileEntry = null;
        FileOutputStream stream = null;
        TarGzOutputStream out = null;
        TarEntry tarEntry = null;
        FileInputStream fileInputStream = null;
        try{
            String fileName = null;
            byteArrayOutputStream = new ByteArrayOutputStream();
            out = new TarGzOutputStream(byteArrayOutputStream);
            tarEntry = null;
        
            int compressedFileListSize = 0;
            int nRead = 0;
            byte buffer[] = new byte[1024];
            for(int fileCount = 0 ; fileCount < compressedFileList.size(); fileCount++){
                fileName = (String)compressedFileList.get(fileCount);
                compressedFileEntry = new File(fileName);
                tarEntry = new TarEntry(compressedFileEntry);
                tarEntry.setModTime(compressedFileEntry.lastModified());
                tarEntry.setName(compressedFileEntry.getName());
                out.putNextEntry(tarEntry);
                fileInputStream = new FileInputStream(compressedFileEntry);
                while(true){
                     nRead = fileInputStream.read(buffer, 0, buffer.length);
                    if (nRead <= 0)
                        break;
                    out.write(buffer, 0, nRead);
                }
                fileInputStream.close();
                out.closeEntry();
            }
            out.close();
            
        }catch(Exception e){
            ApplicationRegistry.getInstance().getLog().writeException(e,"Problem encounterd during compression of TarGZipping file.", IfcExceptionId.TAR_CREATION_FAILED);
            throw new ApplicationException(IfcExceptionId.TAR_CREATION_FAILED);
        }finally{
            compressedFileEntry = null;
            out = null;
            tarEntry = null;
            fileInputStream = null;
        }

return byteArrayOutputStream.toByteArray();
}
 

this method retunr successfully byte array.
After that i am doing Encryption here i am passing that byte array to encryptBundle(byte[] tarGzBytes) method.

public static byte[] encryptBundle(byte[] tarGzBytes)throws Exception {
SecretKeySpec skeySpec = null;
byte[] encrypted ;

/*// Get the KeyGenerator
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128); // 192 and 256 bits may not be available
 
    // Generate the secret key specs.
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");*/
 

        String filename = ThreadLocalApplicationRegistry.getRealPath() + "/" + IfcApplicationLiterals.ZIP_BUNDLE_FOLDER_NAME + "/SupportToolsEncryptionKey.properties";
//String filename = "config/SupportToolsEncryptionKey.properties";
        
                
            skeySpec = createKey(filename);
                
    // Instantiate the cipher
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    encrypted = cipher.doFinal(tarGzBytes);
return encrypted ;
}
 

after that i am getting Encrypted TarGz byte array put into session.

is above code right or any thing needs to be done here?

Now i want to download that tarGz from jsp. How should i download tarGz file from jsp help me any one on this?
Please provide sample code for this.


Thanks,
Gopal



[BSouther: Added UBB CODE tags]
[ July 31, 2007: Message edited by: Ben Souther ]

[Ben Souther]

Make a servlet that sets the content type header, sets the Content-Disposition header, loops through your byte array and writes the contents to the servletOutputStream.

Create a hyperlink on your JSP that points to this servlet.

If you want an example of a servlet that streams binary content, I have one on my site.
Look for SimpleStream
http://simple.souther.us