java工具类——java将一串数据按照gzip方式压缩和解压缩

       我要整理在工作中用到的工具类分享出来，也方便自己以后查阅使用，这些工具类都是我自己实际工作中使用的

import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.io.RandomAccessFile;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;import java.util.zip.GZIPInputStream;import java.util.zip.GZIPOutputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipFile;/** * @author tanml * 将一串数据按照gzip方式压缩和解压缩   */public class GZipUtils {// 压缩public static byte[] compress(byte[] data) throws IOException {if (data == null || data.length == 0) {return null;}ByteArrayOutputStream out = new ByteArrayOutputStream();GZIPOutputStream gzip = new GZIPOutputStream(out);gzip.write(data);gzip.close();return  out.toByteArray();//out.toString("ISO-8859-1");}public static byte[] compress(String str) throws IOException {if (str == null || str.length() == 0) {return null;}return compress(str.getBytes("utf-8"));}// 解压缩public static byte[] uncompress(byte[] data) throws IOException {if (data == null || data.length == 0) {return data;}ByteArrayOutputStream out = new ByteArrayOutputStream();ByteArrayInputStream in = new ByteArrayInputStream(data);GZIPInputStream gunzip = new GZIPInputStream(in);byte[] buffer = new byte[256];int n;while ((n = gunzip.read(buffer)) >= 0) {out.write(buffer, 0, n);}gunzip.close();in.close();return out.toByteArray();}public static String uncompress(String str) throws IOException {if (str == null || str.length() == 0) {return str;}byte[] data = uncompress(str.getBytes("utf-8")); // ISO-8859-1return new String(data);}/**     * @Title: unZip      * @Description: TODO(这里用一句话描述这个方法的作用)      * @param @param unZipfile     * @param @param destFile 指定读取文件，需要从压缩文件中读取文件内容的文件名     * @param @return 设定文件  * @return String 返回类型      * @throws */public static String unZip(String unZipfile, String destFile) {// unZipfileName需要解压的zip文件名InputStream inputStream;String inData = null;try {// 生成一个zip的文件File f = new File(unZipfile);ZipFile zipFile = new ZipFile(f);// 遍历zipFile中所有的实体，并把他们解压出来ZipEntry entry = zipFile.getEntry(destFile);if (!entry.isDirectory()) {// 获取出该压缩实体的输入流inputStream = zipFile.getInputStream(entry);ByteArrayOutputStream out = new ByteArrayOutputStream();byte[] bys = new byte[4096];for (int p = -1; (p = inputStream.read(bys)) != -1;) {out.write(bys, 0, p);}inData = out.toString();out.close();inputStream.close();}zipFile.close();} catch (IOException ioe) {ioe.printStackTrace();}return inData;}public static void main(String[] args){String json = "{\"androidSdk\":22,\"androidVer\":\"5.1\",\"cpTime\":1612071603,\"cupABIs\":[\"armeabi-v7a\",\"armeabi\"],\"customId\":\"QT99999\",\"elfFlag\":false,\"id\":\"4a1b644858d83a98\",\"imsi\":\"460015984967892\",\"system\":true,\"systemUser\":true,\"test\":true,\"model\":\"Micromax R610\",\"netType\":0,\"oldVersion\":\"0\",\"pkg\":\"com.adups.fota.sysoper\",\"poll_time\":30,\"time\":1481634113876,\"timeZone\":\"Asia\\/Shanghai\",\"versions\":[{\"type\":\"gatherApks\",\"version\":1},{\"type\":\"kernel\",\"version\":9},{\"type\":\"shell\",\"version\":10},{\"type\":\"silent\",\"version\":4},{\"type\":\"jarUpdate\",\"version\":1},{\"type\":\"serverIps\",\"version\":1}]}";json="ksjdflkjsdflskjdflsdfkjsdf";try {byte[] buf = GZipUtils.compress(json);File fin = new File("D:/temp/test4.txt");FileChannel fcout = new RandomAccessFile(fin, "rws").getChannel();ByteBuffer wBuffer = ByteBuffer.allocateDirect(buf.length);fcout.write(wBuffer.wrap(buf), fcout.size());if (fcout != null) {fcout.close();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}