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Thread: How to Grab the HTML source code of a website URL index page?

  1. #1
    mmm.. coffee JavaPF's Avatar
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    Post How to Grab the HTML source code of a website URL index page?

    This code will grab the HTML source from a given URL.

    Change "website here.com" to a real URL starting with http:// and the program will display the index pages source code in the console.

    The nice thing about this code is it spoofs the connection to make it look like its a web browser.
    This enables you to navigate to sites like google that normally block connections from non web browser applications.

    import java.io.BufferedReader;
    import java.io.InputStreamReader;
    import java.net.URL;
    import java.net.URLConnection;
     
    public class GrabHTML {
     
     public static void Connect() throws Exception{
     
      //Set URL
      URL url = new URL("http://website here.com");
      URLConnection spoof = url.openConnection();
     
      //Spoof the connection so we look like a web browser
      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 = "";
     
      //Loop through every line in the source
      while ((strLine = in.readLine()) != null){
     
       //Prints each line to the console
       System.out.println(strLine);
      }
     
      System.out.println("End of page.");
     }
     
     public static void main(String[] args){
     
      try{
       //Calling the Connect method
       Connect();
      }catch(Exception e){
     
      }
     }
    }
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  2. The Following 2 Users Say Thank You to JavaPF For This Useful Post:

    Bryan (April 22nd, 2010), dave0110 (December 3rd, 2010)


  3. #2
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    Default Re: How to Grab the HTML source of a website URL

    I have found an interesting use for this code... my problem is that I need to be logged into the site first. Is there any way to pass the cookie information when opening the connection?

    I can probably do it with some javascript and a webpage but would rather have it in one app.

    Thanks for the source,
    Jason

  4. #3
    Administrator copeg's Avatar
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    Default Re: How to Grab the HTML source of a website URL

    Use the methods (in URLConnection) getHeaderField to retrieve the cookie, and setRequestProperty to set the cookie. Its a bit more complex than just that, so see the following link for a more detailed description: Handling Cookies Using the java.net API

  5. #4
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    Default Re: How to Grab the HTML source of a website URL

    Thanks for the help.

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    Default Re: How to Grab the HTML source of a website URL

    This is really good, and think it might help me with the application I want to build.

    How could I use this to only pull some information out of a site? for example to filter everything apart from prices of items?
    Thanks
    Duff

  7. #6
    Super Moderator Json's Avatar
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    Default Re: How to Grab the HTML source of a website URL

    You would have to grab the lot and then parse through the source code somehow, maybe a simple regex will work for you.

    // Json

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    Default Re: How to Grab the HTML source of a website URL

    Very nice JavaPF, very nice!

    Together with copegs url and 'login by http post' this is perfect for me

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