java tutorial - Java HttpURLConnection class - java programming - learn java - java basics - java for beginners
Learn Java - Java tutorial - Java http url connection - Java examples - Java programs
- 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{} click below button to copy the code. By - java tutorial - team
- You can typecast it to HttpURLConnection type as given below.
URL url=new URL("http://www.wikitechy.com/tutorials/java");
HttpURLConnection huc=(HttpURLConnection)url.openConnection(); click below button to copy the code. By - java tutorial - team
Sample Code
import java.io.*;
import java.net.*;
public class HttpURLConnectionDemo{
public static void main(String[] args){
try{
URL url=new URL("http://www.wikitechy.com/tutorials/java");
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);}
}
} click below button to copy the code. By - java tutorial - team
Output
Date = Sun, 19 Nov 2017 12:11:14 GMT
Server = Apache
Location = https://www.wikitechy.com/short_url.php
Cache-Control = max-age=172800
Expires = Tue, 21 Nov 2017 12:11:14 GMT
Content-Length = 247
Keep-Alive = timeout=5, max=100
Connection = Keep-Alive