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URLReader.java
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URLReader.java
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package uk.kcl.inf._4ccspra.coursework2;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;
/**
* A utility class providing features for reading from a URL.
*
* This class is meant to be used as follows: <code>
* String sData = URLReader.readURL ("http://www.mypage.net/...");
* if (sData != null) {
* // do something with the data read
* }
* </code>
*
* @author Christian Urban
* @author Steffen Zschaler
*
*/
public class URLReader {
/**
* Function for reading data from a URL. This will return <code>null</code>
* in case of any error and the actual data otherwise. The data returned may
* consist of a number of lines, which will be separated by '\n'. If there
* is any data at all, the string returned will be terminated by a '\n'
* character.
*
* @param sUrl
* the URL to read from. Must be an absolute URL including a
* protocol identifier.
* @return The data obtained by reading from the URL. Assumes textual data.
* If any error occurs, the function returns <code>null</code>.
*/
public static String readURL(String sUrl) {
StringBuilder buf = new StringBuilder();
Scanner in = null;
try {
URL url = new URL(sUrl);
in = new Scanner(url.openStream());
while (in.hasNextLine()) {
buf.append(in.nextLine() + "\n");
}
return buf.toString();
} catch (MalformedURLException e) {
System.err.println(e);
} catch (IOException e) {
System.err.println(e);
} finally {
if (in != null) {
in.close();
}
}
return null;
}
}