/** Taken from Core Web Programming from
* Prentice Hall and Sun Microsystems Press,
* .
* © 2001 Marty Hall and Larry Brown;
* may be freely used or adapted.
*/
// Further simplified getURL method.
public URL getURL() {
if (url != null) {
return(url);
}
System.out.print("Enter URL: ");
System.out.flush();
BufferedReader in = new BufferedReader(
new InputStreamReader(System.in));
String urlString = null;
try {
urlString = in.readLine();
url = new URL(urlString);
} catch(MalformedURLException mue) {
System.out.println(urlString + " is not valid.n" +
"Try again.");
getURL();
} catch(IOException ioe) {
System.out.println("IOError when reading input: " + ioe);
ioe.printStackTrace(); // Can skip return(null) now
} finally {
return(url);
}
}
import java.net.*; // For URL, MalformedURLException
import java.io.*; // For BufferedReader
/** A small class to demonstrate try/catch blocks.
*
* 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 URLTest {
public static void main(String[] args) {
URLTest test = new URLTest();
test.getURL();
test.printURL();
}
private URL url = null;
/** Read a string from user and create a URL from it. If
* reading fails, give up and report error. If reading
* succeeds but URL is illegal, try again.
*/
public URL getURL() {
if (url != null) {
return(url);
}
System.out.print("Enter URL: ");
System.out.flush();
BufferedReader in = new BufferedReader(
new InputStreamReader(System.in));
String urlString;
try {
urlString = in.readLine();
} catch(IOException ioe) {
System.out.println("IOError when reading input: " + ioe);
ioe.printStackTrace(); // Show stack dump.
return(null);
}
try {
url = new URL(urlString);
} catch(MalformedURLException mue) {
System.out.println(urlString + " is not valid.n" +
"Try again.");
getURL();
}
return(url);
}
/** Print info on URL. */
public void printURL() {
if (url == null) {
System.out.println("No URL.");
} else {
String protocol = url.getProtocol();
String host = url.getHost();
int port = url.getPort();
if (protocol.equals("http") && (port == -1)) {
port = 80;
}
String file = url.getFile();
System.out.println("Protocol: " + protocol +
"nHost: " + host +
"nPort: " + port +
"nFile: " + file);
}
}
}
/** Taken from Core Web Programming from
* Prentice Hall and Sun Microsystems Press,
* .
* © 2001 Marty Hall and Larry Brown;
* may be freely used or adapted.
*/
// Simplified getURL method.
public URL getURL() {
if (url != null) {
return(url);
}
System.out.print("Enter URL: ");
System.out.flush();
BufferedReader in = new BufferedReader(
new InputStreamReader(System.in));
String urlString = null;
try {
urlString = in.readLine();
url = new URL(urlString);
} catch(MalformedURLException mue) {
System.out.println(urlString + " is not valid.n" +
"Try again.");
getURL();
} catch(IOException ioe) {
System.out.println("IOError when reading input: " + ioe);
ioe.printStackTrace(); // Show stack dump
return(null);
}
return(url);
}
Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10218
Categories:Programming Code Examples, Java/J2EE/J2ME, Basic Java
Tags:Java/J2EE/J2MEBasic Java
Post Data:2017-01-02 16:04:23
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