Compress files using the Java ZIP API : File Commands « File Input Output « Java

1. Java
2. File Input Output
3. File Commands

Compress files using the Java ZIP API

import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.zip.GZIPOutputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; publicclass Compress { publicstaticvoid gzipFile(String from, String to) throws IOException { FileInputStream in = new FileInputStream(from); GZIPOutputStream out = new GZIPOutputStream(new FileOutputStream(to)); byte[] buffer = newbyte[4096]; int bytesRead; while ((bytesRead = in.read(buffer)) != -1) out.write(buffer, 0, bytesRead); in.close(); out.close(); } /** Zip the contents of the directory, and save it in the zipfile */publicstaticvoid zipDirectory(String dir, String zipfile) throws IOException, IllegalArgumentException { // Check that the directory is a directory, and get its contents File d = newFile(dir); if (!d.isDirectory()) thrownew IllegalArgumentException("Not a directory: " + dir); String[] entries = d.list(); byte[] buffer = newbyte[4096]; // Create a buffer for copying int bytesRead; ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipfile)); for (int i = 0; i < entries.length; i++) { File f = newFile(d, entries[i]); if (f.isDirectory()) continue;//Ignore directory  FileInputStream in = new FileInputStream(f); // Stream to read file  ZipEntry entry = new ZipEntry(f.getPath()); // Make a ZipEntry  out.putNextEntry(entry); // Store entry while ((bytesRead = in.read(buffer)) != -1) out.write(buffer, 0, bytesRead); in.close(); } out.close(); } publicstaticvoid main(String args[]) throws IOException { String from = "."; File f = newFile(from); boolean directory = f.isDirectory(); // Is it a file or directory?  Compress.zipDirectory(from, from + ".zip"); Compress.gzipFile(from, from + ".gz"); } } 

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