Java compression and decompression string, byte array, string

Compression extracted tool class found on the Web, can compress string string

/*** * Compress gzip * *@paramData *@return  */  Public Static byte[] GZip (byte[] data) {  byte[] B =NULL; Try{bytearrayoutputstream Bos=NewBytearrayoutputstream (); Gzipoutputstream gzip=NewGzipoutputstream (BOS);   Gzip.write (data);   Gzip.finish ();   Gzip.close (); b=Bos.tobytearray ();  Bos.close (); } Catch(Exception ex) {ex.printstacktrace (); }  returnb;}/*** * Unzip gzip * *@paramData *@return  */  Public Static byte[] Ungzip (byte[] data) {  byte[] B =NULL; Try{Bytearrayinputstream bis=Newbytearrayinputstream (data); Gzipinputstream gzip=NewGzipinputstream (bis); byte[] buf =New byte[1024]; intnum =-1; Bytearrayoutputstream BAOs=NewBytearrayoutputstream ();  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 (); }  returnb;}/*** * Compressed zip * *@paramData *@return  */  Public Static byte[] Zip (byte[] data) {  byte[] B =NULL; Try{bytearrayoutputstream Bos=NewBytearrayoutputstream (); Zipoutputstream Zip=NewZipoutputstream (BOS); ZipEntry entry=NewZipEntry ("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 (); }  returnb;}/*** * Unzip zip * *@paramData *@return  */  Public Static byte[] UnZip (byte[] data) {  byte[] B =NULL; Try{Bytearrayinputstream bis=Newbytearrayinputstream (data); Zipinputstream Zip=NewZipinputstream (bis);  while(Zip.getnextentry ()! =NULL) {    byte[] buf =New byte[1024]; intnum =-1; Bytearrayoutputstream BAOs=NewBytearrayoutputstream ();  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 (); }  returnb;}/*** * Compress BZip2 * *@paramData *@return  */  Public Static byte[] BZIP2 (byte[] data) {  byte[] B =NULL; Try{bytearrayoutputstream Bos=NewBytearrayoutputstream (); Cbzip2outputstream bzip2=NewCbzip2outputstream (BOS);   Bzip2.write (data);   Bzip2.flush ();   Bzip2.close (); b=Bos.tobytearray ();  Bos.close (); } Catch(Exception ex) {ex.printstacktrace (); }  returnb;} /*** * Unzip BZIP2 * *@paramData *@return  */  Public Static byte[] UNBZIP2 (byte[] data) {  byte[] B =NULL; Try{Bytearrayinputstream bis=Newbytearrayinputstream (data); Cbzip2inputstream bzip2=NewCbzip2inputstream (bis); byte[] buf =New byte[1024]; intnum =-1; Bytearrayoutputstream BAOs=NewBytearrayoutputstream ();  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 (); }  returnb;}/*** Convert byte array to 16 binary string * *@paramBarray *@return  */  Public StaticString bytestohexstring (byte[] barray) {StringBuffer SB=NewStringBuffer (barray.length);  String stemp;  for(inti = 0; i < barray.length; i++) {stemp= Integer.tohexstring (0xFF &Barray[i]); if(Stemp.length () < 2) Sb.append (0);  Sb.append (Stemp.touppercase ()); }  returnsb.tostring ();}/***jzlib Compressing Data * *@paramObject *@return  * @throwsIOException*/  Public Static byte[] Jzlib (byte[] object) {  byte[] data =NULL; Try{Bytearrayoutputstream out=NewBytearrayoutputstream (); Zoutputstream Zout=NewZoutputstream (out, jzlib.z_default_compression); DataOutputStream Objout=NewDataOutputStream (zout);   Objout.write (object);   Objout.flush ();   Zout.close (); Data=Out.tobytearray ();  Out.close (); } Catch(IOException e) {e.printstacktrace (); }  returndata;} /***jzlib Compressed Data * *@paramObject *@return  * @throwsIOException*/  Public Static byte[] Unjzlib (byte[] object) {  byte[] data =NULL; Try{Bytearrayinputstream in=NewBytearrayinputstream (object); Zinputstream ZIn=NewZinputstream (in); byte[] buf =New byte[1024]; intnum =-1; Bytearrayoutputstream BAOs=NewBytearrayoutputstream ();  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 (); }  returndata;}  Public Static voidMain (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:" +NewString (B2)); byte[] B3 =bZip2 (S.getbytes ()); System.out.println ("BZIP2:" +bytestohexstring (b3)); byte[] B4 =UNBZIP2 (B3); System.out.println ("UNBZIP2:" +NewString (B4)); byte[] B5 =GZip (S.getbytes ()); System.out.println ("BZIP2:" +bytestohexstring (B5)); byte[] B6 =Ungzip (B5); System.out.println ("UNBZIP2:" +NewString (B6)); byte[] B7 =Jzlib (S.getbytes ()); System.out.println ("Jzlib:" +bytestohexstring (B7)); byte[] B8 =Unjzlib (B7); System.out.println ("Unjzlib:" +NewString (B8)); }}

Java compression and decompression string, byte array, string