Java compression and decompression string __java compressed string

Reprint Address: https://www.cnblogs.com/dongzhongwei/p/5964758.html

LZ: Ding Dong ^v^

/*** * Compressed gzip * * @param data * @return/public static byte[] GZip (byte[] data) {byte[] b = null;
   try {bytearrayoutputstream bos = new Bytearrayoutputstream ();
   Gzipoutputstream gzip = new Gzipoutputstream (BOS);
   Gzip.write (data);
   Gzip.finish ();
   Gzip.close ();
   b = Bos.tobytearray ();
  Bos.close ();
  catch (Exception ex) {ex.printstacktrace ();
 return b;
  /*** * Extract gzip * * @param data * @return/public static byte[] Ungzip (byte[] data) {byte[] b = null;
   try {Bytearrayinputstream bis = new Bytearrayinputstream (data);
   Gzipinputstream gzip = new Gzipinputstream (bis);
   byte[] buf = new byte[1024];
   int num =-1;
   Bytearrayoutputstream BAOs = new Bytearrayoutputstream ();
   while (num = gzip.read (buf, 0, Buf.length))!=-1) {baos.write (buf, 0, num);
   } B = Baos.tobytearray ();
   Baos.flush ();
   Baos.close ();
   Gzip.close ();
  Bis.close ();
  catch (Exception ex) {ex.printstacktrace (); } rEturn b;
  /*** * Compressed Zip * * @param data * @return/public static byte[] Zip (byte[] data) {byte[] b = null;
   try {bytearrayoutputstream bos = new Bytearrayoutputstream ();
   Zipoutputstream zip = new Zipoutputstream (BOS);
   ZipEntry entry = new ZipEntry ("Zip");
   Entry.setsize (data.length);
   Zip.putnextentry (entry);
   Zip.write (data);
   Zip.closeentry ();
   Zip.close ();
   b = Bos.tobytearray ();
  Bos.close ();
  catch (Exception ex) {ex.printstacktrace ();
 return b;
  /*** * Extract Zip * * @param data * @return/public static byte[] UnZip (byte[] data) {byte[] b = null;
   try {Bytearrayinputstream bis = new Bytearrayinputstream (data);
   Zipinputstream zip = new Zipinputstream (bis);
    while (zip.getnextentry ()!= null) {byte[] buf = new byte[1024];
    int num =-1;
    Bytearrayoutputstream BAOs = new Bytearrayoutputstream ();
    while (num = zip.read (buf, 0, Buf.length))!=-1) {baos.write (buf, 0, num);
  }  b = Baos.tobytearray ();
    Baos.flush ();
   Baos.close ();
   } zip.close ();
  Bis.close ();
  catch (Exception ex) {ex.printstacktrace ();
 return b;
  /*** * Compressed BZIP2 * * @param data * @return/public static byte[] BZIP2 (byte[] data) {byte[] b = null;
   try {bytearrayoutputstream bos = new Bytearrayoutputstream ();
   Cbzip2outputstream bzip2 = new Cbzip2outputstream (BOS);
   Bzip2.write (data);
   Bzip2.flush ();
   Bzip2.close ();
   b = Bos.tobytearray ();
  Bos.close ();
  catch (Exception ex) {ex.printstacktrace ();
 return b; 
  /*** * Extract BZIP2 * * @param data * @return/public static byte[] UNBZIP2 (byte[] data) {byte[] b = null;
   try {Bytearrayinputstream bis = new Bytearrayinputstream (data);
   Cbzip2inputstream bzip2 = new Cbzip2inputstream (bis);
   byte[] buf = new byte[1024];
   int num =-1;
   Bytearrayoutputstream BAOs = new Bytearrayoutputstream (); while (num = bzip2.read (buf, 0, Buf.length))!=-1){baos.write (buf, 0, num);
   } B = Baos.tobytearray ();
   Baos.flush ();
   Baos.close ();
   Bzip2.close ();
  Bis.close ();
  catch (Exception ex) {ex.printstacktrace ();
 return b; 
  /** * Converts a byte array to a 16-character string * * @param barray * @return/public static string Bytestohexstring (byte[] barray) {
  StringBuffer sb = new StringBuffer (barray.length);
  String stemp;
   for (int i = 0; i < barray.length i++) {stemp = integer.tohexstring (0xFF & Barray[i]);
   if (Stemp.length () < 2) sb.append (0);
  Sb.append (Stemp.touppercase ());
 return sb.tostring (); /** *jzlib Compressed Data * * @param object * @return * @throws ioexception/public static byte[] Jzlib (byte[) o
  bject) {byte[] data = null;
   try {bytearrayoutputstream out = new Bytearrayoutputstream ();
   Zoutputstream zout = new Zoutputstream (out, jzlib.z_default_compression);
   DataOutputStream objout = new DataOutputStream (zout);
   Objout.write (object); Objout.Flush ();
   Zout.close ();
   data = Out.tobytearray ();
  Out.close ();
  catch (IOException e) {e.printstacktrace ();
 } return data; /** *jzlib Compressed Data * * @param object * @return * @throws ioexception/public static byte[] Unjzlib (byte[)
  Object) {byte[] data = null;
   try {bytearrayinputstream in = new Bytearrayinputstream (object);
   Zinputstream zIn = new Zinputstream (in);
   byte[] buf = new byte[1024];
   int num =-1;
   Bytearrayoutputstream BAOs = new Bytearrayoutputstream ();
   while (num = zin.read (buf, 0, Buf.length))!=-1) {baos.write (buf, 0, num);
   data = Baos.tobytearray ();
   Baos.flush ();
   Baos.close ();
   Zin.close ();
   
  In.close ();
  catch (IOException e) {e.printstacktrace ();
 } return data;
  
  public static void Main (string[] args) {String s = ' This is a test ';
  Byte[] B1 = Zip (S.getbytes ());
  System.out.println ("Zip:" + bytestohexstring (B1));
  byte[] B2 = UnZip (B1); System.out.println ("UnZip:"+ New String (B2));
  byte[] B3 = bZip2 (S.getbytes ());
  System.out.println ("BZIP2:" + bytestohexstring (b3));
  byte[] B4 = unBZip2 (b3);
  System.out.println ("UNBZIP2:" + new String (B4));
  Byte[] B5 = GZip (S.getbytes ());
  System.out.println ("BZIP2:" + bytestohexstring (B5));
  Byte[] B6 = Ungzip (B5);
  System.out.println ("UNBZIP2:" + new String (B6));
  byte[] B7 = Jzlib (S.getbytes ());
  System.out.println ("Jzlib:" + bytestohexstring (B7));
  byte[] B8 = Unjzlib (b7);
 System.out.println ("Unjzlib:" + new String (B8)); }
}