Jun 20, 2013

Java: How to get cookie from HttpURLConnection

Here the simple code to get the site response cookie.

URL urlReq = new URL("http://www.google.com");

conn = (HttpURLConnection) urlReq.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(8000);
conn.setConnectTimeout(8000);

// Start building other http request parameter
conn.setRequestProperty("User-Agent", "Mozilla/5.0 (X11; Linux i686; rv:21.0) Gecko/20100101 Firefox/21.0");
conn.setRequestProperty("Accept-Language","en-us,en;q=0.5");
conn.setRequestProperty("Accept-Encoding", "gzip, deflate");
conn.setRequestProperty("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
conn.setRequestProperty("Connection", "close");

conn.setDoOutput(true);
conn.setDoInput(true);

conn.connect();
resCode = conn.getResponseCode(); 
if (resCode==HttpURLConnection.HTTP_OK){
 for(Map.Entry<String, List<String>> headers : conn.getHeaderFields().entrySet()){
 if (headers.getKey().equals("set-cookie")){
      logger.info("\t==>"+headers.getKey());
      for(String hval : headers.getValue()){
       logger.info("\t\t==>"+hval);
      }
 }else{
  logger.info("\t==>"+headers.getKey() +" = "+conn.getHeaderField(headers.getKey()));
 }
}





You can also use
conn.getHeaderField("Set-Cookie")
However, the bad thing is you can one get one cookie, I suggest to use
conn.getHeaderFields()

Happy Reading

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