java:urls
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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java:urls [2015/03/23 20:21] gthanos [Δημιουργώντας ένα URL] |
java:urls [2015/03/23 20:53] gthanos [Χρησιμοποιώντας την κλάση URL για να ανοίξουμε ένα απομακρυσμένο resource] |
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| Line 31: | Line 31: | ||
| URL aURL = new URL("http://example.com:80/docs/books/tutorial" | URL aURL = new URL("http://example.com:80/docs/books/tutorial" | ||
| - | + "/index.html?name=networking#DOWNLOADING"); | + | + "/index.html?name=john&sirname=smith#flushing"); |
| System.out.println("protocol = " + aURL.getProtocol()); | System.out.println("protocol = " + aURL.getProtocol()); | ||
| Line 45: | Line 45: | ||
| </code> | </code> | ||
| + | Το αποτέλεσμα εκτέλεσης του παραπάνω κώδικα είναι το εξής | ||
| + | <code> | ||
| + | protocol = http | ||
| + | authority = example.com:80 | ||
| + | host = example.com | ||
| + | port = 80 | ||
| + | path = /docs/books/tutorial/index.html | ||
| + | query = name=john&sirname=smith | ||
| + | filename = /docs/books/tutorial/index.html?name=john&sirname=smith | ||
| + | ref = flushing | ||
| + | </code> | ||
| + | ===== Χρησιμοποιώντας την κλάση URL για να ανοίξουμε ένα απομακρυσμένο resource ===== | ||
| + | |||
| + | <code java URLReader.java> | ||
| + | import java.net.*; | ||
| + | import java.io.*; | ||
| + | |||
| + | public class URLReader { | ||
| + | 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"); | ||
| + | BufferedReader in = new BufferedReader( | ||
| + | new InputStreamReader(url.openStream()) ); | ||
| + | |||
| + | 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() ); | ||
| + | } | ||
| + | } | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | To παραπάνω θα μπορούσε να γραφεί ισοδύναμα ως εξής με χρήση ενός αντικειμένου [[http://docs.oracle.com/javase/7/docs/api/java/net/URLConnection.html|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() ); | ||
| + | } | ||
| + | } | ||
| + | } | ||
| + | </code> | ||
java/urls.txt · Last modified: 2016/02/26 11:15 (external edit)
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