Java HttpURLConnection class

The Java HttpURLConnection class is http specific URLConnection. It works for HTTP protocol only.

By the help of HttpURLConnection class, you can information of any HTTP URL such as header information, status code, response code etc.

The java.net.HttpURLConnection is subclass of URLConnection class.

How to get the object of HttpURLConnection class

The openConnection() method of URL class returns the object of URLConnection class.

Syntax

public URLConnection openConnection()throws IOException{}

You can typecast it to HttpURLConnection type as given below.

Example

snippet

URL url=new URL("http://www.rookienerd.com/java-tutorial");  
HttpURLConnection huc=(HttpURLConnection)url.openConnection();

HttpURLConnecton Example

snippet

import java.io.*;  
import java.net.*;  
public class HttpURLConnectionDemo{  
public static void main(String[] args){  
try{  
URL url=new URL("http://www.rookienerd.com/java-tutorial");  
HttpURLConnection huc=(HttpURLConnection)url.openConnection();
for(int i=1;i<=8;i++){
System.out.println(huc.getHeaderFieldKey(i)+" = "+huc.getHeaderField(i));
}
huc.disconnect(); 
}catch(Exception e){System.out.println(e);}  
}  
}

Output

Date = Wed, 10 Dec 2014 19:31:14 GMT Set-Cookie = JSESSIONID=D70B87DBB832820CACA5998C90939D48; Path=/ Content-Type = text/html Cache-Control = max-age=2592000 Expires = Fri, 09 Jan 2015 19:31:14 GMT Vary = Accept-Encoding,User-Agent Connection = close Transfer-Encoding = chunked