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Get zip entry compression method

This is an example of how to get the ZipEntry Compression method. The compression method of a ZipEntry can be either STORED for uncompressed entries, or DEFLATED for compressed (deflated) entries. Getting the compression method of the ZipEntry implies that you should:

  • Create a new ZipFile to read a zip file with the given name.
  • Get the Enumeration of the ZipEntry objects of the ZipFile, with entries() API method of ZipFile and iterate through each one of them.
  • For each one of the ZipEntry objects get its Compression method, with getMethod() API method of ZipEntry. The method returns either the compression method or -1 if no compression method is specified.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class GetZipEntryCompressionMethod {
	
	public static void main(String[] args) {
		
		ZipFile zipFile = null;

		try {
			
			// open a zip file for reading
			zipFile = new ZipFile("c:/archive.zip");

			// get an enumeration of the ZIP file entries
			Enumeration<? extends ZipEntry> e = zipFile.entries();

			while (e.hasMoreElements()) {
				
				ZipEntry entry = e.nextElement();

				// get the compression method of the entry, or -1 if not specified
				int method = entry.getMethod();

				if (method == ZipEntry.DEFLATED) {
					System.out.println(entry.getName() + " is Deflated");
				}
				else if (method == ZipEntry.STORED) {
					System.out.println(entry.getName() + "is Stored");
				}
				else if (method == -1) {
					System.out.println(entry.getName() + " is Not Specified");
				}

			}

		}
		catch (IOException ioe) {
			System.out.println("Error opening zip file" + ioe);
		}
		 finally {
			 try {
				 if (zipFile!=null) {
					 zipFile.close();
				 }
			 }
			 catch (IOException ioe) {
					System.out.println("Error while closing zip file" + ioe);
			 }
		 }
		
	}

}

 
This was an example of how to get the Compression method of a ZipEntry in Java.

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