classe de ferramenta java gzip

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GZIPUtils {     public static final String GZIP_ENCODE_UTF_8 = "UTF-8";      String final pública estática GZIP_ENCODE_ISO_8859_1 = "ISO-8859-1";

    
    public static byte [] compress (String str, String encoding) {         if (str == null || str.length () == 0) {             return null;         }         ByteArrayOutputStream out = new ByteArrayOutputStream ();         GZIPOutputStream gzip;         tente {             gzip = new GZIPOutputStream (out);             gzip.write (str.getBytes (codificação));             gzip.close ();         } catch (Exception e) {             e.printStackTrace ();         }         return out.toByteArray ();     }     public static byte [] compress (String str) lança IOException {           return compress (str, GZIP_ENCODE_UTF_8);  














    


    }
    
    byte estático público [] descompactar (byte [] bytes) {         if (bytes == null || bytes.length == 0) {             return null;         }         ByteArrayOutputStream out = new ByteArrayOutputStream ();         ByteArrayInputStream in = new ByteArrayInputStream (bytes);         tente {             GZIPInputStream ungzip = new GZIPInputStream (em);             byte [] buffer = novo byte [256];             int n;             while ((n = ungzip.read (buffer))> = 0) {                 out.write (buffer, 0, n);             }         } catch (Exception e) {             e.printStackTrace ();         }















        return out.toByteArray ();
    }
    
    public static String uncompressToString (byte [] bytes, String encoding) {  
        if (bytes == null || bytes.length == 0) {  
            return null;  
        }  
        ByteArrayOutputStream out = new ByteArrayOutputStream ();  
        ByteArrayInputStream in = new ByteArrayInputStream (bytes);  
        tente {             GZIPInputStream ungzip = new GZIPInputStream (em);               byte [] buffer = novo byte [256];               int n;               while ((n = ungzip.read (buffer))> = 0) {                   out.write (buffer, 0, n);               }               return out.toString (codificação);







        } catch (Exception e) {             e.printStackTrace ();         }         return null;     }     público estático String uncompressToString (byte [] bytes) {           return uncompressToString (bytes, GZIP_ENCODE_UTF_8);       }      public static void main (String [] args) lança IOException {         String s = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";         System.out.println ("字符串 长度 ：" + s.length ());         System.out.println ("压缩 后 ：:" + compress (s) .length);         System.out.println ("解压 后 ：" + descompactar (compress (s)). Length);         System.out.println ("解压 字符串 后 后 ：" + uncompressToString (compress (s)). Length ());