1. import javax.crypto.Cipher;

2. import javax.crypto.spec.IvParameterSpec;

3. import javax.crypto.spec.SecretKeySpec;

4. import sun.misc.BASE64Decoder;

5. import sun.misc.BASE64Encoder;

6. public class AESCoder{

7. public static String encrypt(String strKey, String strIn) throws Exception {

8. SecretKeySpec skeySpec = getKey(strKey);

9. Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

10. IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());

11. cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

12. byte[] encrypted = cipher.doFinal(strIn.getBytes());

13. return new BASE64Encoder().encode(encrypted);

14. }

15. public static String decrypt(String strKey, String strIn) throws Exception {

16. SecretKeySpec skeySpec = getKey(strKey);

17. Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

18. IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());

19. cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

20. byte[] encrypted1 = new BASE64Decoder().decodeBuffer(strIn);

21. byte[] original = cipher.doFinal(encrypted1);

22. String originalString = new String(original);

23. return originalString;

24. }

25. private static SecretKeySpec getKey(String strKey) throws Exception {

26. byte[] arrBTmp = strKey.getBytes();

27. byte[] arrB = new byte[16]; // 建立一個空的16位位元組陣列（預設值為0）

28. for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {

29. arrB[i] = arrBTmp[i];

30. }

31. SecretKeySpec skeySpec = new SecretKeySpec(arrB, "AES");

32. return skeySpec;

33. }

34. public static void main(String[] args) throws Exception {

35. String Code = "中文ABc123";

36. String key = "1q2w3e4r";

37. String codE;

38. codE = AESCoder.encrypt(key, Code);

39. System.out.println("原文：" + Code);

40. System.out.println("金鑰：" + key);

41. System.out.println("密文：" + codE);

42. System.out.println("解密：" + AESCoder.decrypt(key, codE));

43. }

44. }

轉自 http://www.cnblogs.com/freeliver54/archive/2011/10/09/2203342.html