java:urls
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java:urls [2015/03/23 20:32] gthanos [Χρησιμοποιώντας την κλάση URL για να ανοίξουμε ένα απομακρυσμένο resource] |
java:urls [2015/03/23 20:51] gthanos [Χρησιμοποιώντας την κλάση URL για να ανοίξουμε ένα απομακρυσμένο resource] |
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| Line 64: | Line 64: | ||
| public class URLReader { | public class URLReader { | ||
| - | public static void main(String[] args) { | + | public static void main(String[] args) { |
| - | + | URL url=null; | |
| - | try { | + | try { |
| - | URL oracle = new URL("http://www.oracle.com/"); | + | url = new URL(args.length>0 ? args[0] : "http://feeds.bbci.co.uk/news/rss.xml"); |
| BufferedReader in = new BufferedReader( | BufferedReader in = new BufferedReader( | ||
| - | new InputStreamReader(oracle.openStream()) ); | + | new InputStreamReader(url.openStream()) ); |
| String inputLine; | String inputLine; | ||
| Line 76: | Line 76: | ||
| } | } | ||
| in.close(); | in.close(); | ||
| - | catch(MalformedURLException ex) { | + | } |
| + | catch(MalformedURLException ex) { | ||
| + | System.out.println("Malformed URL: +"+ args[0] ); | ||
| + | ex.printStackTrace(); | ||
| + | } | ||
| + | catch(IOException ex) { | ||
| + | System.out.println("Error while reading or writing from URL: "+url.toString() ); | ||
| + | } | ||
| + | } | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | To παραπάνω θα μπορούσε να γραφεί ισοδύναμα ως εξής με χρήση ενός αντικειμένου URLConnection | ||
| + | <code java URLConnectionReader.java> | ||
| + | import java.net.*; | ||
| + | import java.io.*; | ||
| + | |||
| + | public class URLConnectionReader { | ||
| + | public static void main(String[] args) { | ||
| + | URL url=null; | ||
| + | try { | ||
| + | url = new URL(args.length>0 ? args[0] : "http://feeds.bbci.co.uk/news/rss.xml"); | ||
| + | URLConnection urlcon = url.openConnection(); | ||
| + | BufferedReader in = new BufferedReader( | ||
| + | new InputStreamReader(urlcon.getInputStream()) ); | ||
| + | |||
| + | String inputLine; | ||
| + | while ((inputLine = in.readLine()) != null) { | ||
| + | System.out.println(inputLine); | ||
| + | } | ||
| + | in.close(); | ||
| + | } | ||
| + | catch(MalformedURLException ex) { | ||
| + | System.out.println("Malformed URL: +"+ args[0] ); | ||
| + | ex.printStackTrace(); | ||
| + | } | ||
| + | catch(IOException ex) { | ||
| + | System.out.println("Error while reading or writing from URL: "+url.toString() ); | ||
| } | } | ||
| } | } | ||
java/urls.txt · Last modified: 2016/02/26 11:15 (external edit)
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