Web scraping: Difference between revisions
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Only use libraries that come at no ''extra'' monetary cost with the programming language and that are widely available and popular such as [http://www.cpan.org/ CPAN] for Perl or [http://www.boost.org/ Boost] for C++. |
Only use libraries that come at no ''extra'' monetary cost with the programming language and that are widely available and popular such as [http://www.cpan.org/ CPAN] for Perl or [http://www.boost.org/ Boost] for C++. |
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== |
=={{header|Java}}== |
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<java>import java.io.BufferedReader; |
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<python> |
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import |
import java.io.IOException; |
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import java.io.InputStreamReader; |
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import java.net.URL; |
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import java.net.URLConnection; |
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public class WebTime{ |
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public static void main(String[] args){ |
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try{ |
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URL address = new URL( |
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"http://tycho.usno.navy.mil/cgi-bin/timer.pl"); |
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URLConnection conn = address.openConnection(); |
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BufferedReader in = new BufferedReader( |
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new InputStreamReader(conn.getInputStream())); |
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String line; |
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while(!(line = in.readLine()).contains("UTC")); |
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System.out.println(line.substring(4)); |
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}catch(IOException e){ |
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System.err.println("error connecting to server."); |
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e.printStackTrace(); |
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} |
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} |
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} |
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</java> |
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=={{header|Python}}== |
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<python>import urllib |
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page = urllib.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl') |
page = urllib.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl') |
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print line.strip()[4:] |
print line.strip()[4:] |
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break |
break |
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page.close() |
page.close()</python> |
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</python> |
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Sample Output: |
Sample Output: |
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<pre>Aug. 20, 19:50:38 UTC</pre> |
<pre>Aug. 20, 19:50:38 UTC</pre> |
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Revision as of 20:27, 20 August 2008
You are encouraged to solve this task according to the task description, using any language you may know.
Create a program that downloads the time from this URL: http://tycho.usno.navy.mil/cgi-bin/timer.pl and then prints the current UTC time by extracting just the UTC time from the web page's HTML.
Only use libraries that come at no extra monetary cost with the programming language and that are widely available and popular such as CPAN for Perl or Boost for C++.
Java
<java>import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection;
public class WebTime{
public static void main(String[] args){
try{
URL address = new URL(
"http://tycho.usno.navy.mil/cgi-bin/timer.pl");
URLConnection conn = address.openConnection();
BufferedReader in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while(!(line = in.readLine()).contains("UTC"));
System.out.println(line.substring(4));
}catch(IOException e){
System.err.println("error connecting to server.");
e.printStackTrace();
}
}
}
</java>
Python
<python>import urllib
page = urllib.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl') for line in page:
if ' UTC\n' in line:
print line.strip()[4:]
break
page.close()</python> Sample Output:
Aug. 20, 19:50:38 UTC