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Old 02-24-2010, 04:42 AM   #1
Kakarot_Rathish
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Registered: Sep 2008
Posts: 35
Blog Entries: 1

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Java code to implement "wget" to save a web page in linux


This is the code i used, there is no error in execution but no file is bein saved in the working directory.
I'm new in java,so just started learning.
if some one can help me out with this wil be really great

Thanx in advance



public class Hel
{
public static void main(String args[])
throws IOException
{
try
{
Process q = Runtime.getRuntime().exec("export http_proxy='http://it06106036:it06106036@172.16.0.254:8080'");
Process p = Runtime.getRuntime().exec(" wget -U MyBrowser/1.0 http://59.165.190.44/exams/results1/btechNEW/BT55displayNEW.php?regno=mkageit026&Submit=Submit");

BufferedReader r= new BufferedReader(new InputStreamReader(q.getInputStream())); //juz added this to call the constructors
r.readLine();
BufferedReader s= new BufferedReader(new InputStreamReader(p.getInputStream()));
s.readLine();
}catch(IOException ioe)
{
System.exit(1);
}

}
}
 
Old 02-24-2010, 01:45 PM   #2
smoker
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Registered: Oct 2004
Distribution: Fedora Core 4, 12, 13, 14, 15, 17
Posts: 2,279

Rep: Reputation: 248Reputation: 248Reputation: 248
Does
Code:
wget -U MyBrowser/1.0 http://59.165.190.44/exams/results1/btechNEW/BT55displayNEW.php?regno=mkageit026&Submit=Submit
work outside the program ?

Have you tested it in a shell ?

Also have a read of this
http://www.coderanch.com/t/454874/Ja...a-code#2026903
then this
http://www.javaworld.com/javaworld/j...ps.html?page=1
 
Old 02-24-2010, 02:15 PM   #3
tuxdev
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Registered: Jul 2005
Distribution: Slackware
Posts: 2,012

Rep: Reputation: 111Reputation: 111
The two execs run in completely separate environments.

Anyhow, this is completely the wrong way to go about this. Use an actual HTTP client API, like Apache's. Or *maybe* a JNI'd interface to cURL.
 
Old 03-06-2010, 12:18 AM   #4
Kakarot_Rathish
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Registered: Sep 2008
Posts: 35
Blog Entries: 1

Original Poster
Rep: Reputation: 15
in a shell,it works fine and it saves the page in the home directory

Quote:
Originally Posted by smoker View Post
Does
Code:
wget -U MyBrowser/1.0 http://59.165.190.44/exams/results1/btechNEW/BT55displayNEW.php?regno=mkageit026&Submit=Submit
work outside the program ?

Have you tested it in a shell ?

Also have a read of this
http://www.coderanch.com/t/454874/Ja...a-code#2026903
then this
http://www.javaworld.com/javaworld/j...ps.html?page=1
 
Old 03-07-2010, 11:10 PM   #5
Kakarot_Rathish
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Registered: Sep 2008
Posts: 35
Blog Entries: 1

Original Poster
Rep: Reputation: 15
import java.io.*;
import java.io.IOException;

public class Hel
{
public static void main(String args[])
throws IOException
{
try
{

String cmd = "ls -al";
Runtime run = Runtime.getRuntime();
Process pr = run.exec(cmd);
pr.waitFor();
BufferedReader buf = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String line = "";
while ((line=buf.readLine())!=null) {
System.out.println(line);}

}catch(IOException ioe)
{
System.exit(1);
}

}
}

i tried to just implement ls command....
and during that when i compile i get the following error.I have added try and catch but still iam gettin unhandled exception .plz help


Station71:~/RESA/wget# javac Hel.java
----------
1. ERROR in Hel.java (at line 25)
pr.waitFor();
^^^^^^^^^^^^
Unhandled exception type InterruptedException
----------
 
Old 03-08-2010, 02:02 AM   #6
Kakarot_Rathish
Member
 
Registered: Sep 2008
Posts: 35
Blog Entries: 1

Original Poster
Rep: Reputation: 15
when i removed pr.waitFor(),it worked just fine.
thank you

Quote:
Originally Posted by Kakarot_Rathish View Post
import java.io.*;
import java.io.IOException;

public class Hel
{
public static void main(String args[])
throws IOException
{
try
{

String cmd = "ls -al";
Runtime run = Runtime.getRuntime();
Process pr = run.exec(cmd);
pr.waitFor();
BufferedReader buf = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String line = "";
while ((line=buf.readLine())!=null) {
System.out.println(line);}

}catch(IOException ioe)
{
System.exit(1);
}

}
}

i tried to just implement ls command....
and during that when i compile i get the following error.I have added try and catch but still iam gettin unhandled exception .plz help


Station71:~/RESA/wget# javac Hel.java
----------
1. ERROR in Hel.java (at line 25)
pr.waitFor();
^^^^^^^^^^^^
Unhandled exception type InterruptedException
----------
 
  


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