Extract Zip File With Subdirectories Using Command Line Argument Example

/*
	Extract Zip File With Subdirectories Using Command Line Argument Example.
	This Java example shows how to extract a zip file and create required 
	sub-directories using Java ZipInputStream class.
*/
 
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;
 
public class ExtractFileSubDirectories {
 
	public static void main(String args[])
	{
 
		/*
		 * This program expects one command line argument
		 * 
		 * 1. Path of zip file
		 */
 
		 //fetch command line argument
		 String strZipFile = args[0];
 
		 if(strZipFile == null || strZipFile.equals(""))
		 {
			System.out.println("Invalid source file");
			System.exit(0);
		 }
 
		//call method to unzip/extract files from zip file
		unzip(strZipFile);
 
		System.out.println("Zip file extracted!");
	}
 
	private static void unzip(String strZipFile) {
 
		try
		{
			/*
			 * STEP 1 : Create directory with the name of the zip file
			 * 
			 * For e.g. if we are going to extract c:/demo.zip create c:/demo 
			 * directory where we can extract all the zip entries
			 * 
			 */
			File fSourceZip = new File(strZipFile);
			String zipPath = strZipFile.substring(0, strZipFile.length()-4);
			File temp = new File(zipPath);
			temp.mkdir();
			System.out.println(zipPath + " created");
 
			/*
			 * STEP 2 : Extract entries while creating required
			 * sub-directories
			 * 
			 */
			ZipFile zipFile = new ZipFile(fSourceZip);
			Enumeration e = zipFile.entries();
 
			while(e.hasMoreElements())
			{
				ZipEntry entry = (ZipEntry)e.nextElement();
				File destinationFilePath = new File(zipPath,entry.getName());
 
				//create directories if required.
				destinationFilePath.getParentFile().mkdirs();
 
				//if the entry is directory, leave it. Otherwise extract it.
				if(entry.isDirectory())
				{
					continue;
				}
				else
				{
					System.out.println("Extracting " + destinationFilePath);
 
					/*
					 * Get the InputStream for current entry
					 * of the zip file using
					 * 
					 * InputStream getInputStream(Entry entry) method.
					 */
					BufferedInputStream bis = new BufferedInputStream(zipFile
															.getInputStream(entry));
 
					int b;
					byte buffer[] = new byte[1024];
 
					/*
					 * read the current entry from the zip file, extract it
					 * and write the extracted file.
					 */
					FileOutputStream fos = new FileOutputStream(destinationFilePath);
					BufferedOutputStream bos = new BufferedOutputStream(fos,
									1024);
 
					while ((b = bis.read(buffer, 0, 1024)) != -1) {
							bos.write(buffer, 0, b);
					}
 
					//flush the output stream and close it.
					bos.flush();
					bos.close();
 
					//close the input stream.
					bis.close();
				}
			}
		}
		catch(IOException ioe)
		{
			System.out.println("IOError :" + ioe);
		}
 
	}
}
 
/*
Sample usage of this prgram
 
java ExtractFileSubDirectories c:/sampleDoc.zip
 
Output of this program would be
Zip file extracted!
 
This program will extract file from C:/sampleDoc.zip to 
c:/sampleDoc directory with all required sub-directories.
 
*/