原文:Deflater与Inflater的压缩与解压缩

package util;

import java.util.Arrays;

import java.util.zip.Deflater;

import java.util.zip.Inflater;

import org.apache.commons.codec.binary.Base64;

public class StringZlibUtil {

	/**

	 * 用zlib压缩

	 * @param message

	 * @return

	 * @throws Exception

	 */

	public static byte[] zlibCompress(String message)throws Exception

	{

		String chatacter="UTF-8";

		byte[] input = message.getBytes(chatacter);

		System.out.println("input length "+input.length);

	    byte[] output = new byte[input.length+10+new Double(Math.ceil(input.length*0.25f)).intValue()];

	    System.out.println(output.length);

	    Deflater compresser = new Deflater();

	    compresser.setInput(input);

	    compresser.finish();

	    int compressedDataLength = compresser.deflate(output);

	    System.out.println("compressedDataLength "+compressedDataLength);

	    compresser.end();

	    //String ostr=new String(output,0,compressedDataLength,chatacter);

	    //System.out.println("out str "+ostr);

	    return Arrays.copyOf(output, compressedDataLength);

	}

	/**

	 * 解压缩

	 * @param barr   需要解压缩的字节数组

	 * @param charater  对应压缩时的编码方式

	 * @return

	 * @throws Exception

	 */

	public static byte[] zlibInfCompress(byte[] barr,String charater)throws Exception{

		byte[] result=new byte[2014];

		Inflater inf=new Inflater();

		inf.setInput(barr);

		int infLen=inf.inflate(result);

		inf.end();

		String strOgr=new String(result,charater);

		System.out.println("str ogr "+strOgr);

		return Arrays.copyOf(result, infLen);

	}

	public static void main(String[] args)throws Exception{

		String str="abcde|qqqqqqqqqqqqqqq|wwwwwwwwwwwwwwwwwwww";

		//方法一：

		/*byte[] def=StringZlibUtil.zlibCompress(str);

		byte[] inf=StringZlibUtil.zlibInfCompress(def, "UTF-8");

		String strOgr=new String(inf,"UTF-8");

		System.out.println("str org main "+strOgr);*/

		//方法二：以下是使用基本base64的编码与解码

		byte[] def=StringZlibUtil.zlibCompress(str);

		String strBase=Base64.encodeBase64String(def);

		System.out.println("str base64 string "+strBase);

		byte[] decStr=Base64.decodeBase64(strBase);

		byte[] decode_str=StringZlibUtil.zlibInfCompress(decStr, "UTF-8");

		String decStrOgr=new String(decode_str,"UTF-8");

		System.out.println("decStrOgr "+decStrOgr);

	}

}