Deflater与Inflater的压缩与解压缩

来源：互联网发布：餐饮业数据分析编辑：程序博客网时间：2024/05/16 18:16
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);}}
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