gzip工具类 支持字符串压缩解压缩

import java.io.ByteArrayInputStream;  import java.io.ByteArrayOutputStream;  import java.io.File;  import java.io.FileInputStream;  import java.io.FileOutputStream;  import java.io.IOException;import java.io.InputStream;  import java.io.OutputStream;  import java.util.zip.GZIPInputStream;  import java.util.zip.GZIPOutputStream;    /**  * GZIP工具  *   */  public abstract class GZipUtils {        public static final int BUFFER = 1024;      public static final String EXT = ".gz";      private static String encode = "utf-8";//"ISO-8859-1"     private static String hexStr ="0123456789ABCDEF";//全局    /**      * 数据压缩      *       * @param data      * @return      * @throws IOException      * @throws Exception      */      public static byte[] compress(byte[] data) throws IOException {          ByteArrayInputStream bais = new ByteArrayInputStream(data);          ByteArrayOutputStream baos = new ByteArrayOutputStream();            // 压缩          compress(bais, baos);            byte[] output = baos.toByteArray();            baos.flush();          baos.close();            bais.close();            return output;      }        /**      * 字符串解压缩      *       * @param data      * @return      * @throws IOException      * @throws Exception      */      public static String compressStr(String data) throws IOException {             return BinaryToHexString(compress(data.getBytes(encode)));      }        /**      * 文件压缩      *       * @param file      * @throws Exception      */      public static void compress(File file) throws Exception {          compress(file, true);      }        /**      * 文件压缩      *       * @param file      * @param delete      *            是否删除原始文件      * @throws Exception      */      public static void compress(File file, boolean delete) throws Exception {          FileInputStream fis = new FileInputStream(file);          FileOutputStream fos = new FileOutputStream(file.getPath() + EXT);            compress(fis, fos);            fis.close();          fos.flush();          fos.close();            if (delete) {              file.delete();          }      }        /**      * 数据压缩      *       * @param is      * @param os      * @throws IOException      * @throws Exception      */      public static void compress(InputStream is, OutputStream os) throws IOException               {            GZIPOutputStream gos = new GZIPOutputStream(os);            int count;          byte data[] = new byte[BUFFER];          while ((count = is.read(data, 0, BUFFER)) != -1) {              gos.write(data, 0, count);          }            gos.finish();            gos.flush();          gos.close();      }        /**      * 文件压缩      *       * @param path      * @throws Exception      */      public static void compress(String path) throws Exception {          compress(path, true);      }        /**      * 文件压缩      *       * @param path      * @param delete      *            是否删除原始文件      * @throws Exception      */      public static void compress(String path, boolean delete) throws Exception {          File file = new File(path);          compress(file, delete);      }        /**      * 字符串解压缩      *       * @param data      * @return      * @throws IOException      * @throws Exception      */      public static String decompressStr(String data) throws IOException {             return new String(decompress(HexStringToBinary(data)),encode);      }        /**      * 数据解压缩      *       * @param data      * @return      * @throws IOException      * @throws Exception      */      public static byte[] decompress(byte[] data) throws IOException {          ByteArrayInputStream bais = new ByteArrayInputStream(data);          ByteArrayOutputStream baos = new ByteArrayOutputStream();            // 解压缩            decompress(bais, baos);            data = baos.toByteArray();            baos.flush();          baos.close();            bais.close();            return data;      }        /**      * 文件解压缩      *       * @param file      * @throws Exception      */      public static void decompress(File file) throws Exception {          decompress(file, true);      }        /**      * 文件解压缩      *       * @param file      * @param delete      *            是否删除原始文件      * @throws Exception      */      public static void decompress(File file, boolean delete) throws Exception {          FileInputStream fis = new FileInputStream(file);          FileOutputStream fos = new FileOutputStream(file.getPath().replace(EXT,                  ""));          decompress(fis, fos);          fis.close();          fos.flush();          fos.close();            if (delete) {              file.delete();          }      }        /**      * 数据解压缩      *       * @param is      * @param os      * @throws IOException      * @throws Exception      */      public static void decompress(InputStream is, OutputStream os) throws IOException               {            GZIPInputStream gis = new GZIPInputStream(is);            int count;          byte data[] = new byte[BUFFER];          while ((count = gis.read(data, 0, BUFFER)) != -1) {              os.write(data, 0, count);          }            gis.close();      }        /**      * 文件解压缩      *       * @param path      * @throws Exception      */      public static void decompress(String path) throws Exception {          decompress(path, true);      }        /**      * 文件解压缩      *       * @param path      * @param delete      *            是否删除原始文件      * @throws Exception      */      public static void decompress(String path, boolean delete) throws Exception {          File file = new File(path);          decompress(file, delete);      }                public static String BinaryToHexString(byte[] bytes){                        String result = "";            String hex = "";            for(int i=0;i<bytes.length;i++){                //字节高4位                hex = String.valueOf(hexStr.charAt((bytes[i]&0xF0)>>4));             //字节低4位               hex += String.valueOf(hexStr.charAt(bytes[i]&0x0F));               result +=hex;            }            return result;        }        /**        *         * @param hexString        * @return 将十六进制转换为字节数组        */       public static byte[] HexStringToBinary(String hexString){            //hexString的长度对2取整，作为bytes的长度            int len = hexString.length()/2;            byte[] bytes = new byte[len];            byte high = 0;//字节高四位            byte low = 0;//字节低四位               for(int i=0;i<len;i++){                 //右移四位得到高位                 high = (byte)((hexStr.indexOf(hexString.charAt(2*i)))<<4);                 low = (byte)hexStr.indexOf(hexString.charAt(2*i+1));                 bytes[i] = (byte) (high|low);//高地位做或运算            }            return bytes;        }   }