一个小的加密

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 sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class DesTmp {
	
	private static String strDefaultKey = "TmpWin";
	
	private byte[] desKey;

	public DesTmp(){
		 this.desKey = strDefaultKey.getBytes();
	}
	 
	public DesTmp(String desKey) {
		this.desKey = desKey.getBytes();
	}
	
	 /**
	  * 将byte数组转换为表示16进制值的字符串， 如：byte[]{8,18}转换为：0813， 和public static byte[]
	  * hexStr2ByteArr(String strIn) 互为可逆的转换过程
	  * 
	  * @param arrB
	  *            需要转换的byte数组
	  * @return 转换后的字符串
	  * @throws Exception
	  *             本方法不处理任何异常，所有异常全部抛出
	  */
	 public static String byteArr2HexStr(byte[] arrB) throws Exception {
		  int iLen = arrB.length;
		  // 每个byte用两个字符才能表示，所以字符串的长度是数组长度的两倍
		  StringBuffer sb = new StringBuffer(iLen * 2);
		  for (int i = 0; i < iLen; i++) {
		   int intTmp = arrB[i];
		   // 把负数转换为正数
		   while (intTmp < 0) {
		    intTmp = intTmp + 256;
		   }
		   // 小于0F的数需要在前面补0
		   if (intTmp < 16) {
		    sb.append("0");
		   }
		   sb.append(Integer.toString(intTmp, 16));
		  }
		  return sb.toString();
	 }

	 /**
	  * 将表示16进制值的字符串转换为byte数组， 和public static String byteArr2HexStr(byte[] arrB)
	  * 互为可逆的转换过程
	  * 
	  * @param strIn
	  *            需要转换的字符串
	  * @return 转换后的byte数组
	  * @throws Exception
	  *             本方法不处理任何异常，所有异常全部抛出
	  * @author <a href="mailto:[e-mail]">LiGuoQing</a>
	  */
	 public static byte[] hexStr2ByteArr(String strIn) throws Exception {
		int iLen = strIn.getBytes().length;

		// 两个字符表示一个字节，所以字节数组长度是字符串长度除以2
		byte[] arrOut = new byte[iLen / 2];
		String strTmp;
		for (int i = 0; i < iLen; i = i + 2) {
			strTmp = strIn.substring(i, i + 2);
			arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
		}
		return arrOut;
	}	

	public byte[] desEncrypt(byte[] plainText) throws Exception {
		SecureRandom sr = new SecureRandom();
		byte rawKeyData[] = desKey;
		DESKeySpec dks = new DESKeySpec(rawKeyData);
		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
		SecretKey key = keyFactory.generateSecret(dks);
		Cipher cipher = Cipher.getInstance("DES");
		cipher.init(Cipher.ENCRYPT_MODE, key, sr);
		byte data[] = plainText;
		byte encryptedData[] = cipher.doFinal(data);
		return encryptedData;
	}

	public byte[] desDecrypt(byte[] encryptText) throws Exception {
		SecureRandom sr = new SecureRandom();
		byte rawKeyData[] = desKey;
		DESKeySpec dks = new DESKeySpec(rawKeyData);
		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
		SecretKey key = keyFactory.generateSecret(dks);
		Cipher cipher = Cipher.getInstance("DES");
		cipher.init(Cipher.DECRYPT_MODE, key, sr);
		byte encryptedData[] = encryptText;
		byte decryptedData[] = cipher.doFinal(encryptedData);
		return decryptedData;
	}

    public String encrypt(String input) throws Exception {
    	String base64 = base64Encode(desEncrypt(input.getBytes()));
    	base64 = base64.replace("=", "_");
    	base64 = base64.replace("/", "-");
    	base64 = base64.replace("+", "!");
    	base64 = base64.replace("\r\n", "");
    	base64 = base64.replace("\n", "");
    	return base64;
     }    
    

    public String decrypt(String input) throws Exception { 
    	input = input.replace("_", "=");
    	input = input.replace("-", "/");
    	input = input.replace("!", "+");
    	//input = input.replace("", "\r\n");
        byte[] result = base64Decode(input); 
        return new String(desDecrypt(result));
     } 
	
    public static String base64Encode(byte[] s) {   
        if (s == null)   
            return null;   
         BASE64Encoder b = new sun.misc.BASE64Encoder();   
        return b.encode(s);   
     }   
  
    public static byte[] base64Decode(String s) throws IOException {   
        if (s == null)   
            return null;   
         BASE64Decoder decoder = new BASE64Decoder();   
        byte[] b = decoder.decodeBuffer(s);   
        return b;   
     }
    

	public static void main(String[] args) throws Exception {
		//String input = "中国人的一切";//!NrbmCgiHDlxPr5F0wqZM6!eLxOu3cPLr!o5OZ4oVxhszMIfWRm23GxZ3UGOKLb!zxZe!s5rFqF8XZEhywjWrftBnsskzeiG
		//String input = "fdkwHd6fgIfD8eCzwztf1HYVY63Tdnaumso-nfVeP4cXm-K-IiuV88OClQLoNbsop84jlkEZcYmBMNmm-Qu75hPXrZVFd!7J";
		String input = "Z8IvPesWDqiyG!hGExePXLysT5fazHybq1oGZ!L3CBiDkpbhBTxVFn2F1XVri4xueNLQqhJKeKRZLHVO42eYXftBnsskzeiG";
		//String input = "Pd!IipaPNSfHeZFnagGIpHI2GYVlVaHoj2pO60v9KjjXHnLfcOG0HnXTWkiXhB43vofgwTgpqqMVGrNLWR41S-luttdl7M0O-c9zuvDkwnk_//";
		DesTmp crypt = new DesTmp();
		System.out.println("Encode:" + crypt.encrypt(input));
		System.out.println("Decode:" + crypt.decrypt(crypt.encrypt(input)));
		System.out.println("result:" + crypt.decrypt(input));
	}
}