compress String - Java java.lang

Java examples for java.lang:String Compress

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Description

compress String

Demo Code

/*// w  w w  . j  ava2 s  .  c  o  m
 * Copyright 2007, 2012 Stephen Fisher and Junhyong Kim, University of
 * Pennsylvania.
 *
 * This file is part of Glo-DB.
 * 
 * Glo-DB is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Glo-DB is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Glo-DB. If not, see <http://www.gnu.org/licenses/>.
 *
 * @(#)GloDBUtils.java
 */
//package com.java2s;

import java.util.zip.Deflater;

import java.io.ByteArrayOutputStream;

public class Main {
    public static byte[] compressString(String val) {
        byte[] bVal = val.getBytes();

        // Create the compressor with highest level of compression
        Deflater compressor = new Deflater();
        compressor.setLevel(Deflater.BEST_SPEED);

        // Give the compressor the data to compress
        compressor.setInput(bVal);
        compressor.finish();

        // Create an expandable byte array to hold the compressed data.
        // You cannot use an array that's the same size as the orginal because
        // there is no guarantee that the compressed data will be smaller than
        // the uncompressed data.
        ByteArrayOutputStream bos = new ByteArrayOutputStream(val.length());

        // Compress the data
        byte[] buf = new byte[2048];
        while (!compressor.finished()) {
            int count = compressor.deflate(buf);
            bos.write(buf, 0, count);
        }
        try {
            bos.close();
        } catch (Exception e) {
            System.err.println(e);
        }

        return bos.toByteArray();
    }
}

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