UrlRetriever2.java Illustrates how the URL class can simplify communication to an HTTP server.
import java.net.*;
import java.io.*;
/** Read a remote file using the standard URL class
* instead of connecting explicitly to the HTTP server.
*
* Taken from Core Web Programming from
* Prentice Hall and Sun Microsystems Press,
* .
* © 2001 Marty Hall and Larry Brown;
* may be freely used or adapted.
*/
public class UrlRetriever2 {
public static void main(String[] args) {
checkUsage(args);
try {
URL url = new URL(args[0]);
BufferedReader in = new BufferedReader(
new InputStreamReader(url.openStream()));
String line;
while ((line = in.readLine()) != null) {
System.out.println("> " + line);
}
in.close();
} catch(MalformedURLException mue) { // URL constructor
System.out.println(args[0] + "is an invalid URL: " + mue);
} catch(IOException ioe) { // Stream constructors
System.out.println("IOException: " + ioe);
}
}
private static void checkUsage(String[] args) {
if (args.length != 1) {
System.out.println("Usage: UrlRetriever2 ");
System.exit(-1);
}
}
}
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