java 用BASE64 進行加密 解密

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 Crypt {
	// --------------------------------------------------------------------------------------------
	// 獲得密鑰
	public SecretKey getKey(String s) throws Exception {
		System.out.println("s==" + s);
		char[] ss = s.toCharArray();
		String sss = "";
		for (int i = 0; i < ss.length; i = i + 2) {
			sss = sss + ss[i];
		}
		SecretKeyFactory kf = SecretKeyFactory.getInstance("DES");
		DESKeySpec ks = new DESKeySpec(sss.substring(0, 8).getBytes());
		SecretKey kd = kf.generateSecret(ks);
		return kd;
	}

	// --------------------------------------------------------------------------------------------------
	// 返回加密後的字符串
	// key是用於生成密鑰的字符串，input是要加密的字符串
	public String getEncryptedString(String key, String input) {
		String base64 = "";
		try {
			Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
			cipher.init(Cipher.ENCRYPT_MODE, getKey(key));
			System.out.println("getKey(key)===" + getKey(key) + "key==" + key);
			byte[] inputBytes = input.getBytes("UTF8");
			byte[] outputBytes = cipher.doFinal(inputBytes);
			BASE64Encoder encoder = new BASE64Encoder();
			base64 = encoder.encode(outputBytes);
		} catch (Exception e) {
			base64 = e.getMessage();
		}
		return base64;
	}

	// --------------------------------------------------------------------------------------------------
	// 返回解密後的字符串
	// key是用於生成密鑰的字符串，input是要解密的字符串
	public String getDecryptedString(String key, String input) {
		String result = null;
		try {
			Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
			cipher.init(Cipher.DECRYPT_MODE, getKey(key));
			BASE64Decoder decoder = new BASE64Decoder();
			byte[] raw = decoder.decodeBuffer(input);
			byte[] stringBytes = cipher.doFinal(raw);
			result = new String(stringBytes, "UTF8");
		} catch (Exception e) {
			result = e.getMessage();
		}
		return result;
	}

	public static void main(String[] args) {
		Crypt mycrypt = new Crypt();
		try {
			// SecretKey skey = mycrypt.getKey("g8TlgLEc6oqZxdwGe6pDiKB8Y");
			String ss = mycrypt.getEncryptedString("6678912345678906",
					"asdfeeEEEE1231");
			System.out.println("ss==" + ss);
			String ss2 = mycrypt.getDecryptedString("6678912345678906", ss);
			System.out.println("ss2==" + ss2);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}