Hi,
I am trying to connect a web page through java code, using HttpURLConnection api,
I am able to access its welcoe page. But this page is asking for username and password.
Can any one tell me how I can login into the website through java code. The web page is
using the post method to send request to the server.
- Vikas
When you have logged in, the server has to track the identity of the client. It is called session. As HTTP is a state-less protocol, some effort is needed. A widespread method to do this is to use cookies. The server sends a cookie (named SESSIONID if memory serves me right). The client sends it back in the header in every request. So the server can keep track of the client session based on this value.
Accessing the protected resource depends on the authentication method.If it is using BASIC then u can set the Authorization header to the encoded user name and password.For Form based login we don't use this approach.We should have to fill the form component with the required values before posting it.I've a code snippet that works for BASIC.
URL url = new URL("some url");
// Open a HTTP connection to the URL
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
// Authorization [Base64Encoder - user defined class to encode]
conn.setRequestProperty("Authorization", "Basic "+ Base64Encoder.encode("username:password"));
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
dos = new DataOutputStream(conn.getOutputStream());
StringBuffer content = new StringBuffer(1024);
content.append("textboxname1=" + +URLEncoder.encode("value1"));
content.append("textboxname2=" +URLEncoder.encode("value2"));
dos.writeBytes(content.toString());
dos.flush();
--
nt code;
if ((code = conn.getResponseCode()) != 200) {
if(code==401)
//unauthorized user
}
hi all!
i m wrking on a proj in which i need to login on some website and need to fetch the data from this site.i want to do it on regular basis.
i dnt 9 which type of authentication it is using. how to 9 this?.
And can u pl send me the form based authentication code?
thanx in advance!!!!!!!
Hi,
I am trying to connect a web page through java code, using HttpURLConnection api,
I am able to access its welcoe page. But this page is asking for username and password.
Can any one tell me how I can login into the website through java code. The web page is
using the post method to send request to the server.
can u send me the code:
shubhadeep.sengupta@gmail.com
in case of form-based authentication, u must know the name of the compponent that takes user name and password along with the action url. Set the value of these component(similiar to my prev reply) before writing it to the data output stream object. Set only the headers which u think is required.
Hi,
I am using HTTPClient to login to a website. The form specifies POST method. there are 2 hidden types along with username and password used by the form. i have passed all these variables using namevalue pair. However i am not able to login to website. the server returns cookie successfully.
Thanks for the help.
I used the following code in the client java-program:
java.net.Authenticator.setDefault(new simpleAuthenticator());
and simpleAuthenticatior is:
import java.net.PasswordAuthentication;
/**
*
* @author jk
* @version
*/
public class simpleAuthenticator extends java.net.Authenticator {
PasswordAuthentication pa;
/** Creates new simpleAuthenticator */
public simpleAuthenticator () {
pa = new PasswordAuthentication ("", "".toCharArray());
}
public simpleAuthenticator (String user, String pwd) {
pa = new PasswordAuthentication (user, pwd.toCharArray());
}
protected PasswordAuthentication getPasswordAuthentication () {
return pa;
}
}
Regards,
Johannes