java GZIP压缩和解压

 

最近碰到了一个按GZIP解压指定的输入流数据，备份下

 

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;/*** 压缩，解压类*/
public class ZipUtils {/*** 压缩指定的字符串** @param str* @return* @throws IOException*/public static byte[] compress(String str) throws IOException {ByteArrayOutputStream out = new ByteArrayOutputStream();GZIPOutputStream gzip = new GZIPOutputStream(out);gzip.write(str.getBytes());gzip.close();return out.toByteArray();}/*** 解压缩字节数组** @param b* @return* @throws IOException*/public static byte[] uncompress(byte[] b) throws IOException {ByteArrayOutputStream out = new ByteArrayOutputStream();ByteArrayInputStream in = new ByteArrayInputStream(b);GZIPInputStream gunzip = new GZIPInputStream(in);byte[] buffer = new byte[256];int n;while ((n = gunzip.read(buffer)) >= 0) {out.write(buffer, 0, n);}return out.toByteArray();}// 测试方法public static void main(String[] args) throws IOException {}}  

 

注意事项

      解压方法最后不要转成字符串  out.toString(); 否则解压的时候会出现  Not in GZIP format 错误