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Java Zip File Folder Example

Published on August 3, 2022
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By Pankaj
Developer and author at DigitalOcean.
Java Zip File Folder Example

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Today we will look into java zip file example. We will also compress a folder and create zip file using java program.

Java ZIP

java.util.zip.ZipOutputStream can be used to compress a file into ZIP format. Since a zip file can contain multiple entries, ZipOutputStream uses java.util.zip.ZipEntry to represent a zip file entry.

Java ZIP File

java zip file, java zip folder, java zip example Creating a zip archive for a single file is very easy, we need to create a ZipOutputStream object from the FileOutputStream object of destination file. Then we add a new ZipEntry to the ZipOutputStream and use FileInputStream to read the source file to ZipOutputStream object. Once we are done writing, we need to close ZipEntry and release all the resources.

Java Zip Folder

Zipping a directory is little tricky, first we need to get the files list as absolute path. Then process each one of them separately. We need to add a ZipEntry for each file and use FileInputStream to read the content of the source file to the ZipEntry corresponding to that file.

Java Zip Example

Here is the java program showing how to zip a single file or zip a folder in java.

package com.journaldev.files;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipFiles {
    
    List<String> filesListInDir = new ArrayList<String>();

    public static void main(String[] args) {
        File file = new File("/Users/pankaj/sitemap.xml");
        String zipFileName = "/Users/pankaj/sitemap.zip";
        
        File dir = new File("/Users/pankaj/tmp");
        String zipDirName = "/Users/pankaj/tmp.zip";
        
        zipSingleFile(file, zipFileName);
        
        ZipFiles zipFiles = new ZipFiles();
        zipFiles.zipDirectory(dir, zipDirName);
    }

    /**
     * This method zips the directory
     * @param dir
     * @param zipDirName
     */
    private void zipDirectory(File dir, String zipDirName) {
        try {
            populateFilesList(dir);
            //now zip files one by one
            //create ZipOutputStream to write to the zip file
            FileOutputStream fos = new FileOutputStream(zipDirName);
            ZipOutputStream zos = new ZipOutputStream(fos);
            for(String filePath : filesListInDir){
                System.out.println("Zipping "+filePath);
                //for ZipEntry we need to keep only relative file path, so we used substring on absolute path
                ZipEntry ze = new ZipEntry(filePath.substring(dir.getAbsolutePath().length()+1, filePath.length()));
                zos.putNextEntry(ze);
                //read the file and write to ZipOutputStream
                FileInputStream fis = new FileInputStream(filePath);
                byte[] buffer = new byte[1024];
                int len;
                while ((len = fis.read(buffer)) > 0) {
                    zos.write(buffer, 0, len);
                }
                zos.closeEntry();
                fis.close();
            }
            zos.close();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * This method populates all the files in a directory to a List
     * @param dir
     * @throws IOException
     */
    private void populateFilesList(File dir) throws IOException {
        File[] files = dir.listFiles();
        for(File file : files){
            if(file.isFile()) filesListInDir.add(file.getAbsolutePath());
            else populateFilesList(file);
        }
    }

    /**
     * This method compresses the single file to zip format
     * @param file
     * @param zipFileName
     */
    private static void zipSingleFile(File file, String zipFileName) {
        try {
            //create ZipOutputStream to write to the zip file
            FileOutputStream fos = new FileOutputStream(zipFileName);
            ZipOutputStream zos = new ZipOutputStream(fos);
            //add a new Zip Entry to the ZipOutputStream
            ZipEntry ze = new ZipEntry(file.getName());
            zos.putNextEntry(ze);
            //read the file and write to ZipOutputStream
            FileInputStream fis = new FileInputStream(file);
            byte[] buffer = new byte[1024];
            int len;
            while ((len = fis.read(buffer)) > 0) {
                zos.write(buffer, 0, len);
            }
            
            //Close the zip entry to write to zip file
            zos.closeEntry();
            //Close resources
            zos.close();
            fis.close();
            fos.close();
            System.out.println(file.getCanonicalPath()+" is zipped to "+zipFileName);
            
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}

Output of the above java zip example program is:

/Users/pankaj/sitemap.xml is zipped to /Users/pankaj/sitemap.zip
Zipping /Users/pankaj/tmp/.DS_Store
Zipping /Users/pankaj/tmp/data/data.dat
Zipping /Users/pankaj/tmp/data/data.xml
Zipping /Users/pankaj/tmp/data/xmls/project.xml
Zipping /Users/pankaj/tmp/data/xmls/web.xml
Zipping /Users/pankaj/tmp/data.Xml
Zipping /Users/pankaj/tmp/DB.xml
Zipping /Users/pankaj/tmp/item.XML
Zipping /Users/pankaj/tmp/item.xsd
Zipping /Users/pankaj/tmp/ms/data.txt
Zipping /Users/pankaj/tmp/ms/project.doc

Notice that while logging files to zip in directory, I am printing absolute path. But while adding zip entry, I am using relative path from the directory so that when we unzip it, it will create the same directory structure. That’s all for Java zip example.


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About the authors
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Pankaj

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Developer and author at DigitalOcean.

Still looking for an answer?

Was this helpful?

I would like to know, how to zip individual files that all end in the extension of .txt and then have them preserve their name.

- don-pierre

    Hi, Are there anything which can allow to compress a file in different modes like fast compression or full compression. Thanks, Nitish Kashyap

    - Nitish Kashyap

      how to preserve file permissions?

      - Sahil Doshi

        Thank You …

        - Vaibhav G

          Hiii… can you give me a source code of unzip a file with its hirarchy. suppose i have a zip file “DICOM.zip” and it contains a directory called “root”. now again root contains “subroot”. now “subroot” contains three folder “A”,“B”,“C”. and "A"contains some files like a1.img,a2.img,a3.img etc. and “B” and “C” also contains same type of files. So my quation is that, i want such a java program to unzip my “DICOM.zip” so that it can extract the all file with same hirarchy as source hirarchy of the directory. Thanks in advance.

          - sunil mali

            ZipFiles zipFiles = new ZipFiles(); how i can handle this error

            - hardeep

              Hi, how can i save many folders into the zip file?

              - Airam

                I discovered your post on ZipOutputStream after I had finished writing my own code to create an epub (which is a zipfile by another name) from its constituent files. My code is more or less equivalent to yours, and it seems to run clean, but when I look at the epub zipfile after running the code, the file is there but it is length=0. Since there are no exceptions, I have been searching the web for posts like yours. I have run out of ideas. What might I have missed?

                - Chris Gage

                  Hi! I’ve been following your weblog for some time now and finally got the bravery to go ahead and give you a shout out from Lubbock Tx! Just wanted to say keep up the great job!

                  - www.barknetwork.com