DataInputStream to file

It's a rarity that I work in Java, so excuse the ignorance please. I've downloaded the StarPound suite of products (CEBPM tools) and am trying to write a file-conversion utility. I'm having trouble saving a URL to a file, as I don't know how. Here's the code:

Code:

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try {
        u = new URL( "http://test.wav" );
        is = u.openStream();
        dis = new DataInputStream(new BufferedInputStream(is));
        while ((s = dis.readLine()) != null) {
                //System.out.println(s);
                // [COLOR="Red"]Instead of using System.out.println....I'd like to create a local file out of what I downloaded from the server.[/COLOR]
        }
} catch (MalformedURLException mue) {
...

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Thanks in advance!

Jason:confused:

Probably the simplest thing to do is to wrap a PrintWriter around a BufferedWriter, wrapped around a FileWriter. Your PrintWriter will have the same methods that System.out (which is a PrintStream) has, so you can easily adapt whatever sample code you are looking at.

BufferedWriter (Java Platform SE 6)

-Gary-

Appreciate the reply:

Here's what I got...

Code:

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import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class MainClass {

  public static void main(String args[]) throws Exception {

    URL u = new URL("http://www.java2s.com/binary.dat");
    URLConnection uc = u.openConnection();
    String contentType = uc.getContentType();
    int contentLength = uc.getContentLength();
    if (contentType.startsWith("text/") || contentLength == -1) {
      throw new IOException("This is not a binary file.");
    }
    InputStream raw = uc.getInputStream();
    InputStream in = new BufferedInputStream(raw);
    byte[] data = new byte[contentLength];
    int bytesRead = 0;
    int offset = 0;
    while (offset < contentLength) {
      bytesRead = in.read(data, offset, data.length - offset);
      if (bytesRead == -1)
        break;
      offset += bytesRead;
    }
    in.close();

    if (offset != contentLength) {
      throw new IOException("Only read " + offset + " bytes; Expected " + contentLength + " bytes");
    }

    String filename = u.getFile().substring(filename.lastIndexOf('/') + 1);
    FileOutputStream out = new FileOutputStream(filename);
    out.write(data);
    out.flush();
    out.close();
  }
}

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I'd read and write at the same time, no need to hold the whole thing in memory and then write it out.

And I don't think the BufferedInputStream is necessary, just use the original stream directly. I can't see any gain going through a BIS.

Thanks for the suggestion, Tolls. But your recommendation might as well have been in Greek. (I speak American (English, of course) ) Unfortunately I had to find code that I could augment/amend.

I really appreciate everyone's attempts to help...

This is the bit I mean about the buffered stream:

Code:

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    InputStream raw = uc.getInputStream();
    InputStream in = new BufferedInputStream(raw);

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ETA: That second line (the "in" InputStream) is completely unecessary.