How to fetch live data from website ?

How to  fetch  live data from website  ( without RSS feed / Webservice )?  

Do you  use any API ?

Example:  Live cricket scores


I want to write a standalone java program which will fetch  live data from  site. How do I start ?  What are the things I require ?

Could you throw some light .
cofactorAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

IanThCommented:
you need a database so the web site works and you can view the data remotely

Do you use any api

that depends on your setup I expect it will be linux and you can install mysql its usually installed anyway although it can be installed in windows

for remote view
see
http://www.softpedia.com/get/Internet/Servers/Database-Utils/Remote-MySQL-Viewer.shtml
0
Gurvinder Pal SinghCommented:
you can invoke that URL using HTTPURLConnection
http://docs.oracle.com/javase/tutorial/networking/urls/readingWriting.html

once you have got the content of that URL, then you can parse it using Xpath
http://www.rgagnon.com/javadetails/java-0550.html
http://htmlparser.sourceforge.net/
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Gurvinder Pal SinghCommented:
you may have to use jTidy to purify HTML
http://jtidy.sourceforge.net/
0
OWASP: Avoiding Hacker Tricks

Learn to build secure applications from the mindset of the hacker and avoid being exploited.

cofactorAuthor Commented:
@gurvinder372
>>>you can invoke that URL using HTTPURLConnection

Is not that involve a  loop ?  something like this ...

while(true)
{
//HTTPURLConnection ...get data from site
//parse and get  required data
  Thread.sleep(30 secs)
}


OR   there  is some other smart and better approach exists I'm missing here ?


I  know a good package which  is capable of doing this kind of work neatly.  
http://httpunit.sourceforge.net/doc/faq.html

But I'm not sure whether you'll be using a loop to hit server every 30 secs interval to fetch latest updates  or  there is  better  a way ?


Please post you  comments
0
Gurvinder Pal SinghCommented:
smarter approach would be to use web-services exposed by that site to use their data.

for example, google services, or facebook services, or twitter services
0
for_yanCommented:
This is a simple working example of implementation of getting RSS feed form
the list of sites

It uses ROME API, let me find the appropriate link

import java.io.*;
import java.net.URL;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.StringTokenizer;

import com.sun.syndication.feed.synd.SyndEntry;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.SyndFeedInput;
import com.sun.syndication.io.XmlReader;

public class Reader {

 static String [] urls =  {"http://rss.cnn.com/rss/cnn_topstories.rss", "http://www.nytimes.com/services/xml/rss/nyt/World.xml",
 "http://www.nytimes.com/services/xml/rss/nyt/US.xml","http://newsrack.in/crawled.feeds/frontline.rss.xml"
};
public static void main(String[] args) throws Exception {                              

//URL url = new URL("http://viralpatel.net/blogs/feed");

  //  URL url = new URL("http://rss.cnn.com/rss/cnn_topstories.rss");
XmlReader reader = null;

try {

    while(true) {

long now = (new java.util.Date()).getTime();

    System.out.println("checking at " + (new Date(now)).toString());    
long week_before = now - (24L*3600L*7L*1000L);


ArrayList list = new ArrayList();

DataInputStream in = new DataInputStream(new FileInputStream("C:\\temp\\test\\visited.txt"));
PrintStream psout = new PrintStream(new FileOutputStream("C:\\temp\\test\\visited1.txt"));

String buff = null;

while((buff=in.readLine()) != null){
StringTokenizer t = new StringTokenizer(buff);
String ttime = t.nextToken();
if(Long.parseLong(ttime) <week_before)continue;
String llink = t.nextToken().trim();
list.add(llink);
psout.println(ttime + " " + llink);

}

          for (int jj=0; jj<urls.length; jj++){
            URL  url = new URL(urls[jj]);
reader = new XmlReader(url);
SyndFeed feed = new SyndFeedInput().build(reader);
//System.out.println("Feed Title: "+ feed.getAuthor());

for (Iterator i = feed.getEntries().iterator(); i.hasNext();) {
SyndEntry entry = (SyndEntry) i.next();
    String title = entry.getTitle();
     String link = entry.getUri().trim();
     if(list.contains(link))continue;
     Date date = entry.getPublishedDate();
// Problem here -->         **     SyndEntry source = item.getSource();
     String description;
     if (entry.getDescription()== null){
       description = "";
     } else {
       description = entry.getDescription().getValue();
     }
     String cleanDescription = description.replaceAll("\\<.*?>","").replaceAll("\\s+", " ");
        System.out.println(title);
System.out.println(link);
    System.out.println(cleanDescription);



//System.out.println(entry.getTitle());
//System.out.println(entry.getContents());
    System.out.println("");
     System.out.println("");
     psout.println(now + " " + link);
}

}

in.close();
psout.close();
File f0 = new File("C:\\temp\\test\\visited.txt");
File f1 = new File("C:\\temp\\test\\visited1.txt");
f0.delete();
f1.renameTo(f0);

Thread.currentThread().sleep(600000);

    }


} finally {
if (reader != null)
reader.close();
}
}
}
                                            

Open in new window

0
for_yanCommented:
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Java

From novice to tech pro — start learning today.