Java.util.zip.Deflater Compression Inflater Decompression Instance

Source: Java Compression decompression class instance [go]

 PackageCom.example.helloworld;ImportJava.io.ByteArrayOutputStream;Importjava.io.IOException;ImportJava.util.zip.Deflater;ImportJava.util.zip.Inflater;/*** zlib Compression tool * *@authorpresent *@version1.0 *@since1.0*/ Public Abstract classUtils {/*** Compression * *@paramdata to be compressed *@returnbyte[] Compressed data*/     Public Static byte[] Compress (byte[] data) {        byte[] Output =New byte[0]; Deflater Compresser=NewDeflater ();        Compresser.reset ();        Compresser.setinput (data);        Compresser.finish (); Bytearrayoutputstream Bos=NewBytearrayoutputstream (data.length); Try {            byte[] buf =New byte[1024];  while(!compresser.finished ()) {                inti =compresser.deflate (BUF); Bos.write (BUF,0, i); } Output=Bos.tobytearray (); } Catch(Exception e) {output=data;        E.printstacktrace (); } finally {            Try{bos.close (); } Catch(IOException e) {e.printstacktrace ();        }} compresser.end (); returnoutput; }    /*** Unzip * *@paramdata to be compressed *@returnbyte[] decompressed data*/     Public Static byte[] Decompress (byte[] data) {        byte[] Output =New byte[0]; Inflater Decompresser=NewInflater ();        Decompresser.reset ();        Decompresser.setinput (data); Bytearrayoutputstream o=NewBytearrayoutputstream (data.length); Try {            byte[] buf =New byte[1024];  while(!decompresser.finished ()) {                inti =decompresser.inflate (BUF); O.write (BUF,0, i); } Output=O.tobytearray (); } Catch(Exception e) {output=data;        E.printstacktrace (); } finally {            Try{o.close (); } Catch(IOException e) {e.printstacktrace ();        }} decompresser.end (); returnoutput; }     Public Static voidMain (string[] args) {String inputstr= "[email protected]; [Email protected]; [Email protected] "; System.err.println ("Input string: \ t" +inputstr); byte[] input =inputstr.getbytes (); System.err.println ("Input byte length: \ t" +input.length); byte[] data =utils.compress (input); System.err.println ("Byte length after compression: \ t" +data.length); byte[] Output =utils.decompress (data); System.err.println ("Uncompressed byte length: \ t" +output.length); String Outputstr=NewString (output); System.err.println ("Output string: \ t" +outputstr); }}

Java.util.zip.Deflater Compressed Inflater Decompression instance