Java for byte array decompression (ZIP,GZIP,BZIP2,JZLIB)

1. First import Bzip2.jar in the project; (Download address: http://download.csdn.net/detail/majian_1987/5997697)

2. Download Jzlib source code Zip package, extract, and then copy all com.jcraft.jzlib.* Java files to the project (even with a Java file copy), download address: Http://download.csdn.net/detail /majian_1987/5997737

3. Then write the following code:

Import Java.io.ByteArrayInputStream;
Import Java.io.ByteArrayOutputStream;
Import Java.io.DataOutputStream;
Import java.io.IOException;
Import Java.util.zip.GZIPInputStream;
Import Java.util.zip.GZIPOutputStream;
Import Java.util.zip.ZipEntry;
Import Java.util.zip.ZipInputStream;
Import Java.util.zip.ZipOutputStream;
Import Org.apache.tools.bzip2.CBZip2InputStream;
Import Org.apache.tools.bzip2.CBZip2OutputStream;
Import Com.jcraft.jzlib.JZlib;
Import Com.jcraft.jzlib.ZInputStream;
Import Com.jcraft.jzlib.ZOutputStream;
public class Test {/*** * 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 {BYTEARRAYOUTPU
Tstream 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 {Bytearrayo
Utputstream 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; /*** * Decompression BZIP2 * * @param data * @return/public static byte[] UNBZIP2 (byte[] data) {byte[] b = null; try {Bytearra Yinputstream 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) {Stringbuffe
R 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 ();  /** * Compressed Data * * @param object * @return * @throws ioexception/public static byte[] Jzlib (byte[] object) {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; /** * Extract 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));}

Output results

Zip : 504b03041400080008008b82cc3a000000000000000000000000030000007a69702bc9c82c5600a2448592d4e21200504b0708eae71e0d0e0000000e 000000504b010214001400080008008b82cc3aeae71e0d0e0000000e0000000300000000000000000000000000000000007a6970504b0506000000000 1000100310000003f0000000000
Unzip:this is a test
Bzip2:6839314159265359f81d428d0000061180400022600c00200021a34cd42180a9b16d11d0f177245385090f81d428d0
Unbzip2:this is a test
bzip2:1f8b08000000000000002bc9c82c5600a2448592d4e21200eae71e0d0e000000
Unbzip2:this is a test
jzlib:789c2bc9c82c5600a2448592d4e2120026330516
Unjzlib:this is a test