[SOLVED] http request

[Eranga]

Hi all,

For the first time I'm going to do this.

I have a http URL, and I want to make a request through that URL. Response is a String, which I want to use for further processing.

Any comments appreciate.

Eranga

[aibtus]

WHAT DO YOU MEAN BY "Response is as String, which I want to use for further processing. "

D you want to make a URL request via a web browser and get the response for further processing before rendering onto the browser itself or what?

[Eranga]

Ok, I have a URL where I want to make a request. On that request, the URL, actually the server gives a response. Simply a IP which my network is belongs to.

[aibtus]

Ok, I have a URL where I want to make a request. On that request, the URL, actually the server gives a response. Simply a IP which my network is belongs to.

Cool. Now I understand.

Ok, what technology are you using ie: JSP's, Servlets etc???

[Eranga]

Actually I just use simple Java technologies. And I have done it myself. It's not difficult at all. Simply call URL.openStream() to get the replay to a stream buffer. Then store it in a String variable for later user.

So, my problem is solved. Thanks for all who replay and view my post.

Eranga

[Eranga]

Just three lines to use.

            URL myRequest = new URL(my_url_goes_here);
            BufferedReader in = new BufferedReader(new InputStreamReader(myRequest.openStream()));
            String str = in.readLine();
            in.close();

What you think of it.

Eranga.

[aibtus]

Just three lines to use.

Code:

URL myRequest = new URL(my_url_goes_here); BufferedReader in = new BufferedReader(new InputStreamReader(myRequest.openStream())); String str = in.readLine(); in.close();

What you think of it.

Eranga.

It looks simple enough and you say It works... I love it!!
Is the class URL a custom class --- if not, can you give us the full package name. It may come in handy in some other projects. If it is, can you highlight the implementation..

Nice code though!

[Eranga]

Actually nothing much I used. Just import import java.net.URL;

Rather than, you have to handle all the exceptions. You want the full code which I have work on, if so I'll put it here after completing all.

Me too, love this code. It's so simple, really simply. Even you handle all the exceptions, only need to write around 10 to 15 lines.

[aibtus]

Are you still going to put the full code as highlighted earlier, or you intend on sending a private msg?

[Eranga]

Aah,

Actually I'm saying about the exception handling. That's it. Ok, I'll put my code here.

[DonCash]

Hey aibtus - Here is a full code example:

import java.net.*;
import java.io.*;

class httpconnect {

public static void main(String[] args) throws Exception {

URL url = new URL("http://www.google.co.uk/");

URLConnection spoof = url.openConnection();

spoof.setRequestProperty(
"User-Agent", "Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0; H010818)" );

BufferedReader in = new BufferedReader(new InputStreamReader(spoof.getInputStream()));

String strLine = "";

while ((strLine = in.readLine()) != null) {

        System.out.println(strLine);
		
    }
in.close();
  }
}

Note the extra bit of code:

spoof.setRequestProperty( 
"User-Agent", "Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0; H010818)" );

Websites like Google block connections to their site from programs other than web browsers. With this bit of code you can trick sites like these into thinking the connection is coming from a web browser. Very handy!

If you wish to surf through a proxy server then you can also add this code to the top:

System.getProperties().put("proxySet", "true");
System.getProperties().put("proxyPort", "80");
System.getProperties().put("proxyHost", "my.proxyserver.co.uk");

[Eranga]

Nice work, but no need to worry that much pal. Here is my code.

        try{
            URL myRequest = new URL(buildRequestURL());
            //URL myRequest = new URL(requestURL);
            BufferedReader inMessage = new BufferedReader(new InputStreamReader(myRequest.openStream()));
            String httpReplay = inMessage.readLine();
                System.out.println(httpReplay);
                return httpReplay;
            }
            inMessage.close();
        }
        catch(MalformedURLException ex){
            System.out.println(ex);
        }
        catch(IOException ex){
            System.out.println(ex);
        }

That's all. The replay caught here as a String.

[aibtus]

Thanx a lot. I will try it out and best comment later.

Hey aibtus - Here is a full code example:

Code:

import java.net.*; import java.io.*; class httpconnect { public static void main(String[] args) throws Exception { URL url = new URL("http://www.google.co.uk/"); URLConnection spoof = url.openConnection(); spoof.setRequestProperty( "User-Agent", "Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0; H010818)" ); BufferedReader in = new BufferedReader(new InputStreamReader(spoof.getInputStream())); String strLine = ""; while ((strLine = in.readLine()) != null) { System.out.println(strLine); } in.close(); } }

Note the extra bit of code:

Code:

spoof.setRequestProperty( "User-Agent", "Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0; H010818)" );

Websites like Google block connections to their site from programs other than web browsers. With this bit of code you can trick sites like these into thinking the connection is coming from a web browser. Very handy!

If you wish to surf through a proxy server then you can also add this code to the top:

Code:

System.getProperties().put("proxySet", "true"); System.getProperties().put("proxyPort", "80"); System.getProperties().put("proxyHost", "my.proxyserver.co.uk");

[DonCash]

Nice work, but no need to worry that much pal

Yeah I know... Just thought i'd add the extra code because you never know when you'll need it!

The code to trick websites into thinking you are a web browser needs to be used more and more nowdays as sites actively block connections.

[Eranga]

Yes you are correct. At the time I need such a code, just to communicate with my other machine. Time to time I can develop it and I can use it as one of my libraries actually.

And also your code may really helpful to me develop my code segment.

[Eranga]

Major thing I've forget to say is, default browser will be fired by the URL. Actually it bind with.

[DonCash]

Cool Cool

[Eranga]

Ok, I got one scenario few days back. Say the html code comes with newline characters. Something like this,

<html>
<head></Head>
</html>

Because of my readLine() only the <html> tag detected. How can I get whole the code. If I have that code as a single String it works.

Any idea you have?

[DonCash]

Yeah... Use this:

String strLine = "";

while ((strLine = in.readLine()) != null) {

  System.out.println(strLine);
		
}

This will display all the code from the HTML page as it loops through it.

[Eranga]

Hmm, I got the point. Say I want to return that String, I mean the whole String. Then what is the easiest way to do it.