URGENT : malformed URL

[xilver]

hi ... i have written a program similiar to what is attached below. the program is suppose to fetch a url of which will be specified. however, there are times when the url that i want to fetch is broken or malformed and the program returns a MALFORMED URL EXCEPTION. i would like to enquire how i can detect whether a URL link is broken or not ? because my program is suppose to fetch different URLs and that if one URL is malformed, then it will fetch another URL and not hang there ( of which is what happening now ) how do i modify my program so that it can continue to fetch other url instead of stopping when MALFORMED URL EXCEPTION occurs ???

are they any built in boolean functions to test if an URL is malformed ???

would appreciate all help and suggestions .... thank you and best regards.
xilver.


import java.lang.System;
import java.net.*;
import java.io.*;
import java.util.*;
public class URLReader {
public static void main(String[] args) throws Exception {

java.util.Properties prop = System.getProperties();
prop.put("firewallSet", "true");
prop.put("proxyHost", "proxy.ntu.edu.sg"); // replace with your proxy
prop.put("proxyPort", "8080"); // replace with your proxy port
System.setProperties(prop);

URL fetch = new URL(targetURL); // target URL is fetched from a file containing a list of URLS
BufferedReader in = new BufferedReader(
new InputStreamReader(
fetch.openStream()));

PrintWriter out = new PrintWriter(
new BufferedWriter(
new FileWriter(
new File("C:\\documents\\fetch.txt"))));


String inputLine;
while ((inputLine = in.readLine()) != null)
out.println(inputLine);
in.close();
out.close();
}
}

[Norm]

You need to study the try{}catch(){} statement and use that to catch the MalformedURL. Remove the throws clause from the main() method. Here's some simple code:

URL url = null;
try {
url = new URL(.....);
... code to use the good url
}catch(MalformedURLException mue) {
... code to process bad url
}



Norm

[bayard]

to repeat. Never throw Exception from main. It's stupid.

Bayard
bayard@generationjava.com
http://www.generationjava.com

Brainbench MVP for Java
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