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Tip of the Day
Language: Java
Expertise: Intermediate
Nov 7, 2005

Extract JAR and ZIP Entries with JarURLConnection

Use the following code to extract JAR and ZIP Entries with JarURLConnection:

import java.net.*;
import java.io.*;
import java.awt.*;
import java.util.*;
import java.util.jar.*;

class read extends Frame{

URL url=null;
JarURLConnection URLcon=null;
JarFile jar=null;
TextArea TA=new TextArea(15,35);

public read(String titlu)
{
   super(titlu);
}

void init()
{
   setLayout(new FlowLayout());
   setSize(300,300);
   add(TA);
   setVisible(true);
}

public void getURLContent()
{   
   try {          
      //local file
      //url=new URL(
      //"jar:file:/C:/Program%20Files/Java/jdk1.5.0/jre/lib/jsse.jar!/"
      //);
      //remote file
      url=new URL(
        "jar:http://sosnoski.com/opensrc/xmlbench/code/xmlbench.jar!/");
                
      URLcon=(JarURLConnection)(url.openConnection());
      jar=URLcon.getJarFile();
   }catch(MalformedURLException e)
      {System.out.println("Eroare1:"+e.getMessage());
   }catch(IOException e)
      {System.out.println("Eroare2:"+e.getMessage());}                
   }
           
void entry()
{
   Enumeration  entries=jar.entries();
   while(entries.hasMoreElements())
   {
      String entry=((JarEntry)entries.nextElement()).getName();
      TA.append(entry+"\n");
   }  
}
       
}

public class JarURLContent{
   public static void main(String[] args)
      {
   read t=new read("URL");      
      t.getURLContent();
      t.init();    
      t.entry();  
   }
}
Leonard Anghel
 
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