How to create a jar having the contents of the jar in a byte array?

Question

Hi,
I have a server and client application. My server returns the contents of the jar in the form of byte array to the client on a particluar method call. Now at the client end, i want to reconstruct the jar to be used. How do I do this?
The server uses the JarInputStream to read the contents of the jar to be returned. I have tried using the JarOutputStream, but looks like this works fine if we have spearate class files to be added to the jar. Now that I have the contents of the jar itself, how do i recreate the jar?
Can anyone please help me with this?
Thanks
Rajani

Answer 1

Have you ever gotten the raw byte copy to work? If so, how?
I download a jar via InputStream and save into a jar file via fileoutputstream. It always gets corrupted in the process. The new Jar file has the exact same number of bytes, but doesn't get past the Manifest on a -tvf. In fact, Winzip can open it fine, but can't extract. So close...yet so far.
Here is a snapshot of my code:
BufferedInputStream data1=new BufferedInputStream(con.getInputStream());
DataInputStream data=new DataInputStream(data1);
StringBuffer buf=new StringBuffer();
try{
while((theChar=data.read()) != -1)
{ buf.append((char)theChar); }
} catch (Exception z){ logger.info("UpdateThread.read Done Reading jar file");}
data.close();
File newFile = new File("C:/MyJar.jar");
FileOutputStream outstream2 = new FileOutputStream(newFile);
DataOutputStream outstream1 = new DataOutputStream(outstream2);
BufferedOutputStream outstream = new BufferedOutputStream(outstream1);
byte [] bytes = buf.toString().getBytes();
logger.info("Bytes of new Jar file = " + bytes.length);
int i;
for(i=0;i<bytes.length;i++){
outstream.write(bytes);
outstream1.close();
outstream.close();
Any ideas where I'm going wrong?