asked on

use java to locate an XML file ?

Let say, I have an xml file called test.xml locate in
http://127.0.0.1/xml/test.xml.

How do I use java to detect whether the test.xml is there or not ?

Maybe a function that will return 1 if found. otherwise
return 0 for not found.

Any code ?

girionis

You can create a File object by passing the file name as parameter to the constructor spomething like File file = new File("test.xml"); and then call the exists() method (file.exists())to check if the file exists.

Hope it helps.

tcy08

ASKER

But the thing is the java class will not be located in
the web server.

girionis

Hmm I see... If the file resides locally you can just access it by providing its path.

If the file resides remotely then, off the top of my head, you could create a URL object to the remote file you want using the URL(String protocol, String host, String filename) constructor. Then you can create a URLConnection object by passing the URL as the parameter(something like URLConnection urlc = new URLConnection(new URL(<parameters>));). Then you can just use the getContents() method. If it returns something it will probably mean that the file exists, otherwise it probably means that it does not exist.

I am not sure if this would be an optimal solution (or even *a* solution) but it might worth a try.

Hope it helps.

tcy08

ASKER

Here is my code :

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

class ReadURL{
public static void main(String[] args){
try{
URL urlSource = new URL("http://127.0.0.1/try.xml");
URLConnection urlConn = urlSource.openConnection();
urlConn.connect();
InputStreamReader rStream = new InputStreamReader(urlConn.getInputStream());
final int MAX_CHARS = 50;
char[] buffer = new char[MAX_CHARS];
rStream.read(buffer, 0, MAX_CHARS);
final String text = new String(buffer);
System.out.println(text);
rStream.close();
}
catch(IOException e){
System.err.println(e);
}
}
}

I want to look at the first 50 characters from the rStream.
It worked fine. But after displaying the first 50
characters, it waited about 5 seconds to finish the
execution. Why ?

How to make it quit right away ?

ASKER CERTIFIED SOLUTION

girionis

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