Java string compression unzip example

The string I tested is the JQuery source code.

Plaintext length :78082
After compression: 26,566
Length of encryption: 54746
Compression: 41647
-----------------------------
Ciphertext length :41647
Decompression: 54746
Decrypted: 26566
Decompression: 78082
-----------------------------
Success is

Des need Jar: sun. Misc. BASE64Decoder. Jar

The Test

public static void main(String[] args) throws Exception {
  String cont = "";
  String cont2=jm(yjy(cont));
  if(cont.equals(cont2)){
   System.out.println(" Success is ");
  }else{
   System.out.println(" Than failure ");
  }
 }
 public static String yjy(String cont) throws Exception {
  System.out.println(" Clear the length :" + cont.length());
  //First compression
  cont = ZipUtil2.compress(cont);
  System.out.println(" After the compression: " + cont.length());
  //First encryption
  cont = DesUtil.encrypt(cont, DesUtil.PWD_KEY);
  System.out.println(" Length of encryption: " + cont.length());
  //Second compression
  cont = ZipUtil2.compress(cont);
  System.out.println(" recompression :" + cont.length());
  return cont;
 }
 public static String jm(String cont) throws Exception {
  System.out.println("-----------------------------");
  System.out.println(" The length of the cipher :" + cont.length());
  //The first unzip
  cont = ZipUtil2.uncompress(cont);
  System.out.println(" Extract: " + cont.length());
  //First decryption
  cont = DesUtil.decrypt(cont, DesUtil.PWD_KEY);
  System.out.println(" After decryption: " + cont.length());
  //The second unzip
  cont = ZipUtil2.uncompress(cont);
  System.out.println(" Extract: " + cont.length());

  return cont;
 }

DesUtil

import java.io.IOException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import Decoder.BASE64Decoder;
import Decoder.BASE64Encoder;
public class DesUtil {
 private final static String DES = "DES";
 public final static String PWD_KEY = "MZTHPWDJM";
 public final static String ID_KEY = "MZTHIDJM";
 public static void main(String[] args) throws Exception {
  String data = "xkajsdasdk'al;ks'dl;kasl;d";
  System.err.println(" Encryption: "+encrypt(data, PWD_KEY));
  System.err.println(" Decryption: " +decrypt(encrypt(data, PWD_KEY), PWD_KEY));
 }
 
 public static String encrypt(String data, String key) throws Exception {
  byte[] bt = encrypt(data.getBytes(), key.getBytes());
  String strs = new BASE64Encoder().encode(bt);
  return strs;
 }
 
 public static String decrypt(String data, String key) throws IOException,
   Exception {
  if (data == null)
   return null;
  BASE64Decoder decoder = new BASE64Decoder();
  byte[] buf = decoder.decodeBuffer(data);
  byte[] bt = decrypt(buf, key.getBytes());
  return new String(bt);
 }
 
 private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
  //Generate a trusted random number source
  SecureRandom sr = new SecureRandom();
  //Create the DESKeySpec object from the original key data
  DESKeySpec dks = new DESKeySpec(key);
  //Create a key factory and use it to transform the DESKeySpec into a SecretKey object
  SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
  SecretKey securekey = keyFactory.generateSecret(dks);
  //A Cipher object actually does the encryption
  Cipher cipher = Cipher.getInstance(DES);
  //Initializes a Cipher object with a key
  cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
  return cipher.doFinal(data);
 }
 
 private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
  //Generate a trusted random number source
  SecureRandom sr = new SecureRandom();
  //Create the DESKeySpec object from the original key data
  DESKeySpec dks = new DESKeySpec(key);
  //Create a key factory and use it to transform the DESKeySpec into a SecretKey object
  SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
  SecretKey securekey = keyFactory.generateSecret(dks);
  //A Cipher object actually does the decryption
  Cipher cipher = Cipher.getInstance(DES);
  //Initializes a Cipher object with a key
  cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
  return cipher.doFinal(data);
 }
}

ZipUtil2
.

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
//Zip and unzip a string & NBSP;  
public class ZipUtil2 {
 //The test method
 public static void main(String[] args) throws IOException {
  //Test string
  String str = "";
  System.out.println(" The original length: " + str.length());
  System.out.println(" After the compression: " + ZipUtil2.compress(str).length());
  System.out
    .println(" Extract: " + ZipUtil2.uncompress(ZipUtil2.compress(str)));
 }
 //The compression
 public static String compress(String str) throws IOException {
  if (str == null || str.length() == 0) {
   return str;
  }
  ByteArrayOutputStream out = new ByteArrayOutputStream();
  GZIPOutputStream gzip = new GZIPOutputStream(out);
  gzip.write(str.getBytes());
  gzip.close();
  return out.toString("ISO-8859-1");
 }
 //unzip
 public static String uncompress(String str) throws IOException {
  if (str == null || str.length() == 0) {
   return str;
  }
  ByteArrayOutputStream out = new ByteArrayOutputStream();
  ByteArrayInputStream in = new ByteArrayInputStream(
    str.getBytes("ISO-8859-1"));
  GZIPInputStream gunzip = new GZIPInputStream(in);
  byte[] buffer = new byte[256];
  int n;
  while ((n = gunzip.read(buffer)) >= 0) {
   out.write(buffer, 0, n);
  }
  //ToString () USES the platform default code and can be explicitly specified as toString(& Quot; GBK& Quot;)
  return out.toString();
 }
}