Get CRC-32 Checksum of Zip Entry Example

/*
	Get CRC-32 Checksum of Zip Entry Example
	This Java example shows how to get CRC-32 checksum of zip entry
	using getCrc method of Java ZipEntry class.
*/
 
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
 
 
public class GetCRC32Checksum {
 
	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\tCRC-32 Checksum");
			System.out.print("\n---------------------------------\n");
 
			while(e.hasMoreElements())
			{
				ZipEntry entry = (ZipEntry)e.nextElement();
 
				/*
				 * To get CRC-32 checksum of an entry, use
				 * 
				 * long getCrc()
				 * method of Java ZipEntry class.
				 * 
				 * This method returns the CRC checksum for a particular
				 * zip entry, or -1 if not known.
				 */				
 
				String entryName = entry.getName();
				long crc = entry.getCrc();
 
				System.out.print(entryName);
				System.out.print("\t\t\t\t" + crc);
				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				CRC-32 Checksum
---------------------------------
css/datagrid.css			995618961
css/graph.css				2675857370
jsps/Masthead.jspf			1211369105
jsps/Welcome.jsp			665174626
*/