Re: Java URL

Roland de Ruiter <>
Tue, 06 Jun 2006 23:00:17 +0200
Oliver Wong wrote:

<> wrote in message

Exactly. What I did was this:

 public void download(OutputStream os) throws IOException {
   byte[] buffer = new byte[2048]; //2K Buffer

   try {
     int pos = 0;

     URL targetUrl = new URL(this.url);
     URLConnection uc = targetUrl.openConnection();
     InputStream is = uc.getInputStream();

     while ((pos = > 0)
       os.write(buffer, 0, pos);

   } catch (Exception ex) {
     throw new IOException(ex.toString());

But it won't work.

   I've heard that Google blocks Java from connecting to it. Did you
test your program with URLs that don't point to one of Google's servers?

   - Oliver

That's right, Google blocks Java clients. But it can be 'circumvented'
quite easily by setting the User-Agent request header with a value used
by well known browsers. In OP's code:

   URL targetUrl = new URL(this.url);
   URLConnection uc = targetUrl.openConnection();
   uc.addRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows
NT 5.1; en-US; rv: Gecko/20060508 Firefox/");
   InputStream is = uc.getInputStream();

Note, that the string denoting the User-Agent value ("Mozilla/5.0 ...")
should be on one line (i.e. shouldn't contain line breaks).

Java's default value of the User-Agent header is "Java/1.5.0_06" or
similar: the version part in this string depends on which version of JRE
you have installed (or rather: which JRE version is executing the code).


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