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
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.
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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:
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<span style="color: #008000;"><strong><code> /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 </code></strong></span> |
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.