Download remote jar file using java

[shan raj]

Hi,

I want to write a java program to download remote jar file. Any one please help me to proceed further.

Btw, I tried using the below API. but when I open a jar file its not opening.

URL url = new URL("http:\\.....jar");
InputStream in=url.openStream ();

Read as byte array and save into another file using output stream.

[Martijn Verburg]

Hi there and welcome to Javaranch! Can you post a larger code example of what you have so far?

[shan raj]

Hi, I got the answer how to download. There was a problem in writing into the file using BufferedOutputStream. Initially I read the file and written without doing bufOut.flush(). After doing this it worked fine.

Here is the code which i tried. if any one has good alternative or effective approach of downloading file please reply me.

 URL url = new URL("http://...sources.jar");
 
InputStream inStream = url.openStream();
System.out.println(inStream.available());
BufferedInputStream bufIn = new BufferedInputStream(inStream);
            
File fileWrite = new File("outputsrc.jar");
    OutputStream out= new FileOutputStream(fileWrite);
    BufferedOutputStream bufOut = new BufferedOutputStream(out);
                    byte buffer[] = new byte[BUFFER_SIZE];
            while (true) {
int nRead = bufIn.read(buffer, 0, buffer.length);
if (nRead <= 0)
  break;
bufOut.write(buffer, 0, nRead);
        }
            
            bufOut.flush();
            out.close();
            inStream.close();

[Martijn Verburg]

That seems OK although I'm going to assume that in your PRD quality code you'll have the Exception handling, remove the System.out.println etc

[shan raj]

Thanks Martijn.

Yeah will take care of exception handling.