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Compress.javaAPI DocExample4418Sat Jan 24 10:44:26 GMT 2004je3.io

Compress

public class Compress extends Object
This class defines two static methods for gzipping files and zipping directories. It also defines a demonstration program as a nested class.

Fields Summary
Constructors Summary
Methods Summary
public static voidgzipFile(java.lang.String from, java.lang.String to)
Gzip the contents of the from file and save in the to file.

        // Create stream to read from the from file
        FileInputStream in = new FileInputStream(from);
        // Create stream to compress data and write it to the to file.
        GZIPOutputStream out = new GZIPOutputStream(new FileOutputStream(to));
        // Copy bytes from one stream to the other
        byte[] buffer = new byte[4096];
        int bytes_read;
        while((bytes_read = in.read(buffer)) != -1) 
            out.write(buffer, 0, bytes_read);
        // And close the streams
        in.close();
        out.close();
public static voidzipDirectory(java.lang.String dir, java.lang.String zipfile)
Zip the contents of the directory, and save it in the zipfile

        // Check that the directory is a directory, and get its contents
        File d = new File(dir);
        if (!d.isDirectory())
            throw new IllegalArgumentException("Compress: not a directory:  " +
					       dir);
        String[] entries = d.list();
        byte[] buffer = new byte[4096];  // Create a buffer for copying 
        int bytes_read;
	
        // Create a stream to compress data and write it to the zipfile
        ZipOutputStream out =
	    new ZipOutputStream(new FileOutputStream(zipfile));
	
        // Loop through all entries in the directory
        for(int i = 0; i < entries.length; i++) {
            File f = new File(d, entries[i]);
            if (f.isDirectory()) continue;        // Don't zip sub-directories
            FileInputStream in = new FileInputStream(f); // Stream to read file
            ZipEntry entry = new ZipEntry(f.getPath());  // Make a ZipEntry
            out.putNextEntry(entry);                     // Store entry
            while((bytes_read = in.read(buffer)) != -1)  // Copy bytes
                out.write(buffer, 0, bytes_read);
            in.close();                                  // Close input stream
        }
        // When we're done with the whole loop, close the output stream
        out.close();