Java 使用 AES + BASE64加密

工具类：

	// 加密长度
	private final static int LENGTH = 128;
	// 编码方式
	private final static String ENCODE = "UTF-8";
	// 秘钥
	private final static String defaultKey = "password";
	// 前缀
	private final static String defaultPrefix = "KEY:";
 
	/**
	 * AES加密后再使用BASE64加密
	 * 增加前缀
	 * 1.辨识正常数据，使其不进行解密
	 * 2.提高安全度
	 * @param content
	 * @return
	 * @throws Exception
	 */
	public static String encrypt(String content) {
		String value = "";
		try {
                    if(!isEmpty(content)){
			value = defaultPrefix + base64Encode(aesEncryptToBytes(content));
                    }
		} catch (Exception e) {
			System.out.println("EncryptAndDecrypt（加密错误）");
			e.printStackTrace();
		}
		return value;
	}
 
	/**
	 * AES解密后再使用BASE64解密
	 * 增加前缀
	 * 1.辨识正常数据，使其不进行解密
	 * 2.提高安全度
	 * @param encryptStr
	 * @return
	 * @throws Exception
	 */
	public static String decrypt(String encryptStr) {
		String value = "";
		try {
			int length = defaultPrefix.length();
			if (encryptStr.length() > length) {
				String val = encryptStr.substring(0, length);
				if (val.equals(defaultPrefix)) {
					value = aesDecryptByBytes(base64Decode(encryptStr.substring(length)));
				} else {
					value = encryptStr;
				}
			} else {
				value = encryptStr;
			}
		} catch (Exception e) {
			System.out.println("EncryptAndDecrypt（解密错误）");
			e.printStackTrace();
		}
		return value;
	}
 
	/**
	 * AES加密
	 * 
	 * @param content
	 * @return
	 * @throws Exception
	 */
	public static byte[] aesEncryptToBytes(String content) throws Exception {
		KeyGenerator kgen = KeyGenerator.getInstance("AES");
		kgen.init(LENGTH, new SecureRandom(defaultKey.getBytes()));
		Cipher cipher = Cipher.getInstance("AES");
		SecretKeySpec sks = new SecretKeySpec(kgen.generateKey().getEncoded(), "AES");
		cipher.init(Cipher.ENCRYPT_MODE, sks);
		return cipher.doFinal(content.getBytes(ENCODE));
	}
 
	/**
	 * AES解密
	 * 
	 * @param encryptBytes
	 * @return
	 * @throws Exception
	 */
	public static String aesDecryptByBytes(byte[] encryptBytes) throws Exception {
		KeyGenerator kgen = KeyGenerator.getInstance("AES");
		kgen.init(LENGTH, new SecureRandom(defaultKey.getBytes()));
		Cipher cipher = Cipher.getInstance("AES");
		SecretKeySpec sks = new SecretKeySpec(kgen.generateKey().getEncoded(), "AES");
		cipher.init(Cipher.DECRYPT_MODE, sks);
		byte[] decryptBytes = cipher.doFinal(encryptBytes);
		return new String(decryptBytes);
	}
 
	/**
	 * BASE64 加密
	 * 
	 * @param content
	 * @return
	 * @throws Exception
	 */
	public static String base64Encode(byte[] bytes) {
		return new BASE64Encoder().encode(bytes);
	}
 
	/**
	 * BASE64 解密
	 * 
	 * @param content
	 * @return
	 * @throws Exception
	 */
	public static byte[] base64Decode(String base64Code) throws Exception {
		return isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
	}
 
	public static boolean isEmpty(String str) {
		return null == str || "".equals(str.trim());
	}

测试类：

	@Test
	public void contextLoads() {
		String mes = "hello world!";
		String e = EncryptAndDecrypt.encrypt(mes);
		System.out.println("加密后:" + e);
		System.out.println("解密后:" + EncryptAndDecrypt.decrypt(e));
	}

测试结果：

加密后:KEY:OrkVNz0yhBVHsMnWk+BIig==
解密后:hello world!