如何将下面的PHP curl代码转换为JAVA HttpURLConnection?
$username = $_POST['username'];
$headers = array(
"Host: mail.google.com",
"User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.0.4) Gecko/20060508 Firefox/1.5.0.4",
"Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5",
"Accept-Language: en-us,en;q=0.5",
"Accept-Encoding: text", # No gzip, it only clutters your code!
"Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7",
"Date: ".date(DATE_RFC822)
);
$c = curl_init('https://mail.google.com/mail/feed/atom');
curl_setopt($c, CURLOPT_HTTPAUTH, CURLAUTH_ANY); // use authentication
curl_setopt($c, CURLOPT_HTTPHEADER, $headers); // send the headers
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1); // We need to fetch something from a string, so no direct output!
curl_setopt($c, CURLOPT_FOLLOWLOCATION, 1); // we get redirected, so follow
curl_setopt($c, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($c, CURLOPT_SSL_VERIFYHOST, 1);
curl_setopt($c, CURLOPT_UNRESTRICTED_AUTH, 1); // always stay authorised
$wrong = curl_exec($c); // Get it
curl_close($c); // Close the curl stream