利用Java API对字符串进行加密解密（DES加密算法）

 /*Decryptor*/
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
/**
 * Decrypt the password get form Xpress GUI
 */
public class Decryptor{
  
//加密    
 private static byte[] encrypt(int mode, byte[] password) {
  try {
   DESKeySpec desKeySpec = new DESKeySpec("KEY".getBytes());
   SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DES");
   SecretKey secretKey = secretKeyFactory.generateSecret(desKeySpec);
   Cipher cipher = Cipher.getInstance("DES");
   cipher.init(mode, secretKey);
   return cipher.doFinal(password);
  } catch (Exception e) {
   return password;
  }
 }
//解密
 public static  String decrypt(String[] args) {
  int length = args.length;
  byte[] b = new byte[length];
  for(int i = 0; i < length; i++){
   b[i] = new Byte(args[i]);
  }
  return new String(encrypt(Cipher.DECRYPT_MODE, b));
 }
}