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 {

/*** * 压缩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; }

/*** * 解压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; }

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/*** * 压缩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; }

/*** * 解压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; }

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/*** * 压缩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; }

/*** * 解压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; }

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/** * 把字节数组转换成16进制字符串 * * @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(); }

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/** *jzlib 压缩数据 * * @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; }

/** *jzLib压缩的数据 * * @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)); }}