Read the contents of Zip file without Unzip in Java





Hey guys in this post, we will discuss reading the contents of a zip file using ZipFile package in Java. ZipFile is a java.util.zip, it provides some really useful methods and constructor for reading the zip file. let’s look at some of the important methods and constructor.

 Constructors


  • ZipFile(String filePath): This constructor takes the string as parameter. We will pass the zip file path.
    Ex: ZipFile(“D:\\test.zip”)
  • ZipFile(File file): This constructor takes the file object as parameter. We will pass the object of the file.
    Ex: ZipFile(new File(“D:\\test.zip”))

Methods


  • getComment(): String – returns the zip file comment, or null if none.
  • getEntry(String name): ZipEntry – returns the zip file entry for the specified name, or null if not found.
  • getInputStream(ZipEntry entry): InputStream – Returns an input stream for reading the contents of the specified zip file entry.
  • getName(): String – returns the path name of the ZIP file.
  • entries(): Enumeration<? extends ZipEntry> – returns an enumeration of the ZIP file entries.





Let’s look at an example, i have a zip file it contains few files like, excel, pdf, image etc and i stored it in my D:// drive.

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

public class ReadZipFile {
	public static void main(String[] args) throws IOException {
		ZipFile zip = null;
		try {
			zip = new ZipFile("D:\\test.zip");

			for (Enumeration<?> e = zip.entries(); e.hasMoreElements();) {
				ZipEntry entry = (ZipEntry) e.nextElement();
				if (!entry.isDirectory()) {
					System.out.println(entry.getName());
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			zip.close();
		}

	}
}

Here, the important methods to keep in mind is that,

  • isDirectory() This will return boolean telling that whether the zip file contains any folder or not. Here i am ignoring the directory.
  • hasMoreElements() This will return boolean letting us know whether the elements are present or not

This will produce the following output –

chage.png
16001
-----------------------------
fr_leading traling vth spec chars_CSV (1).csv
576
-----------------------------
Pro Angular 6, 3rd Edition.pdf
19403051
-----------------------------

That’s it for this post, i will see you in the next post.

Reference links:





About the author

Bushan Sirgur

Hey guys, I am Bushan Sirgur from Banglore, India. Currently, I am working as an Associate project in an IT company.

View all posts

Leave a Reply

Your email address will not be published. Required fields are marked *