Getting html code of web page

I am trying to get the HTML code of a web page in Java, but I don't actually know how it should work. That is my thoughts:

  public  String getHTML(String pageAddress) throws Exception {
    StringBuilder sb = new StringBuilder();
    URL pageURL = new URL(pageAddress);
    URLConnection uc = pageURL.openConnection();
    BufferedReader br = new BufferedReader(
            new InputStreamReader(uc.getInputStream()) );
    String inputLine;
    try {  
        while ((inputLine = br.readLine()) != null) {
            sb.append(inputLine);
        }
    } finally {
        br.close();
    }
    return sb.toString();
}

When I call

getHTML("http://www.google.com");

It returns empty string. What's wrong?

Thank you in advance!