Get Compressed Size of Zip Entry Example

/*
	Get Compressed Size of Zip Entry Example
	This Java example shows how to get compressed size of particular entry
	(i.e. file or directory) using getCompressedSize method of 
	Java ZipEntry class.
*/
 
import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
 
 
public class GetCompressedSize {
 
	public static void main(String args[])
	{		 
		try
		{
		   /*
			* To Open a zip file, use
			* 
			* ZipFile(String fileName)
			* constructor of the ZipFile class.
			* 
			* This constructor throws IOException for any I/O error.
			*/
		   ZipFile zipFile = new ZipFile("c:/FileIO/WebFiles.zip");
 
		   /*
			* Get list of zip entries using entries method of
			* ZipFile class.
			*/
 
			Enumeration e = zipFile.entries();
 
			System.out.print("File Name");
			System.out.print("\t\t\t\tCompressed Size");
			System.out.println("---------------------------------");
 
			while(e.hasMoreElements())
			{
				ZipEntry entry = (ZipEntry)e.nextElement();
 
				/*
				 * To get compressed size of zip entry, use
				 * 
				 * long getCompressedSize()
				 * method of ZipEntry class.
				 * 
				 * This method returns the size of compressed entry or -1
				 * if the size is not known.
				 * 
				 * PLEASE NOTE that uncompressed size and compressed size
				 * of the zip entries created using ZipEntry.STORED method 
				 * will be same. 
				 * 
				 * However, It differes for zip entries created using
				 * ZipEntry.DEFLATED entries.
				 */
 
				String entryName = entry.getName();
				long compressedSize = entry.getCompressedSize();
 
				System.out.print(entryName);
				System.out.print("\t\t\t\t" + compressedSize);
				System.out.print("\n");
 
			}
 
			 /*
			  * close the opened zip file using,
			  * void close()
			  * method.
			  */
 
			  zipFile.close();
 
		 }
		 catch(IOException ioe)
		 {
			System.out.println("Error opening zip file" + ioe);
		 }
	}
 
}
 
/*
Output of this program would be
File Name				Compressed Size
---------------------------------
css/datagrid.css				3255
css/graph.css					416
jsps/Masthead.jspf				536
jsps/Welcome.jsp				1248
*/