Connecting Web

[Kadirpatel]

Hi All,
I want to connect to the Web using URLConnection class. This is to be accomplished using core Java class. Can any body let me know how it is possible. Any link where I can get some example.
Thnaks.

 

[LittleWing]

don't understand your problem....what is the problem?

 

[Kadirpatel]

Hi LittleWing,
The problem is that I want to make a search on the web. For that I want to connect to web using servlet. My site architecture is
HTML -----> Servlet
and servlet will do the searching job. So i want to know that how can i connect to web, using some Java class.
If the question is not clear please let me know, i'm ready to explain it once more.
Waiting for replies.

 

[Vepo]

Hi Kadirpatel,

If I understood right, you want to connect to the certain Web page by using URLConnection.
Well, here is how URLConnection works:

URL url = new URL("URLaddress"
URLConnection urlc = url.openConnection();
urlc.setDoOutput(true);
.
.
.
Then you can get Input- and OutputStreams by using URLConnection's
getInputStream() and getOutputStream() methods.

-Vepo

 

[Kadirpatel]

Thanks Vepo,
I'll definitely try it our and let you know. But i think that i'll also take care for Proxy. Isn't it ? I'll just check for that. But can u tell me that if i have to connect through proxy then what i should be doing.
Thanks.

 

[Vepo]

Hi,

I haven't got much experiences about that, but you can check this example, it may help you:

http://www.java-live.de/studium/proxy/source_code/html/UserURLConnection.java.html

I have connected trough proxy by using plain sockets, then HTTP-headers have to be added manually, like proxy redirect -address (like "POST /redirectAddress/ ....&quot


You may also need authentication if the proxy needs it. Then you may use java's BASE64Encoder to authenticate user:

String userPassword = theUsername + ":" + thePassword;
String encoding = new sun.misc.BASE64Encoder().encode (userPassword.getBytes());

URLConnection uc = url.openConnection();

uc.setRequestProperty ("Authorization", "Basic " + encoding);

 

[Kadirpatel]

Thanks Vepo for your reply. I'm working on it and think that it will help me a lot. Thanls again.