java加密工具类，可设置对应的加解密key

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public class AesEncryptUtil {
    
    //使用AES-128-CBC加密模式，key需要为16位,key和iv可以相同！
    private static String KEY ="whshenke20180606";
    
    private static String IV ="whshenke20180606";    
    /**
     * 加密方法
     * @param data  要加密的数据
     * @param key 加密key
     * @param iv 加密iv
     * @return 加密的结果
     * @throws Exception
     */
    public static String encrypt(String data, String key, String iv) throws Exception {
        try {

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");//"算法/模式/补码方式"
            int blockSize = cipher.getBlockSize();

            byte[] dataBytes = data.getBytes();
            int plaintextLength = dataBytes.length;
            if (plaintextLength % blockSize != 0) {
                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
            }

            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);

            return Base64Util.encode(encrypted);
            
            

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 解密方法
     * @param data 要解密的数据
     * @param key  解密key   
     * @param iv 解密iv
     * @return 解密的结果
     * @throws Exception whshenke20180606
     */
    public static String desEncrypt(String data, String key, String iv)  {
        try {
            byte[] encrypted1 = Base64Util.decode(data);

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "UTF-8");
            return originalString;
        } catch (Exception e) {
            //e.printStackTrace();
            return null;
        }
        
        
    }
    
    /**
     * 使用默认的key和iv加密
     * @param data
     * @return
     * @throws Exception
     */
    public static String encrypt(String data) throws Exception {
        return encrypt(data, KEY, IV);
    }
    
    /**
     * 使用默认的key和iv解密
     * @param data
     * @return
     * @throws Exception
     */
    public static String desEncrypt(String data){
        return desEncrypt(data, KEY, IV);
    }
    
    
    
    /**
    * 测试
    */
    public static void main(String args[]) throws Exception {
        //KNnAbiCvFxispeG+wS01jA==    
        //KNnAbiCvFxispeG+wS01jA==
        //KNnAbiCvFxispeG+wS01jA==
        String test = "测试";

        String data = null;
        String key = "dufy20170329java";
        String iv = "dufy20170329java";

    //    data = encrypt(test, key, iv);
//KNnAbiCvFxispeG+wS01jA==
        
        System.out.println(data);
        System.out.println(desEncrypt("8XguKV2aprVwg4UqEie7f9gkr7xDaSKrGZZD7x1J3uISWkvQAtpq8hpkskwi V+8bJmRcmQWIZ4sRom37GB7w7O4AH+HjH5ixViJ7k6bx+oEFVWSmIqKEj4e5 lMcyXgcXpTB8IGnt1WKS2p7Qnn+cjA==", key, iv));
    }
    
}

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