package com.doumee.core.utils;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.util.zip.GZIPInputStream;
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import java.util.zip.GZIPOutputStream;
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import org.apache.commons.io.output.ByteArrayOutputStream;
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public class CompressUtil {
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/**
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* 对字节数组进行gzip压缩
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* <p>
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*
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* @author jgzhang2, 2014-8-13
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*
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* ：压缩前的字节数组
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* @return：压缩后的字节数组
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*/
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public static byte[] compressByGzip(byte[] str) {
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if (str == null || str.length == 0) {
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return null;
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}
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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GZIPOutputStream gzip;
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try {
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gzip = new GZIPOutputStream(out);
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gzip.write(str);
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gzip.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return out.toByteArray();
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}
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/**
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* <p>
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*
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* @author jgzhang2, 2014-8-16
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*
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* @param bytesToUncompress
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* @param encoding
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* @return
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* @throws IOException
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*/
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public static byte[] uncompressByGzip(byte[] bytesToUncompress,
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String encoding) throws IOException {
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if (bytesToUncompress == null || bytesToUncompress.length == 0) {
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return null;
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}
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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ByteArrayInputStream in = new ByteArrayInputStream(bytesToUncompress);
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GZIPInputStream gunzip = new GZIPInputStream(in);
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byte[] buffer = new byte[256];
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int n;
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while ((n = gunzip.read(buffer)) >= 0) {
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out.write(buffer, 0, n);
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}
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return out.toByteArray();
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}
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}
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