摘要：系統交互流程授權碼生成加密解密算法算法名稱算法名稱加密模式填充方式編碼生成密鑰對象密鑰字符串密鑰對象加密數據待加密數據密鑰加密后的數據實例化對象，它用于完成實際的加密操作初始化對象，設置為加密模式執(zhí)行加密操作。

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

/**
 * @author liuzhongxu
 * @date 2019/4/16
 */
public class AESUtil {
    /**
     * 算法名稱
     */
    public static final String KEY_ALGORITHM = "AES";
    /**
     *算法名稱/加密模式/填充方式
     */
    public static final String CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
    /**
     * 編碼
     */
    public static final String CHARSET_NAME = "UTF-8";

    /**
     *
     * 生成密鑰key對象
     * @param keyStr 密鑰字符串
     * @return 密鑰對象
     * @throws InvalidKeyException
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeySpecException
     * @throws Exception
     */
    private static SecretKey keyGenerator(String keyStr) throws Exception {
        SecretKeySpec secretKey = new SecretKeySpec(keyStr.getBytes(CHARSET_NAME), KEY_ALGORITHM);
        return secretKey;
    }
    /**
     * 加密數據
     * @param data 待加密數據
     * @param key 密鑰
     * @return 加密后的數據
     */
    public static String encrypt(String data, String key) throws Exception {
        Key secretKey = keyGenerator(key);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes(CHARSET_NAME));
        // 實例化Cipher對象，它用于完成實際的加密操作
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        // 初始化Cipher對象，設置為加密模式
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
        byte[] results = cipher.doFinal(data.getBytes(CHARSET_NAME));
        // 執(zhí)行加密操作。加密后的結果通常都會用Base64編碼進行傳輸
        return Base64.encodeBase64String(results);
    }
    /**
     * 解密數據
     * @param data 待解密數據
     * @param key 密鑰
     * @return 解密后的數據
     */
    public static String decrypt(String data, String key) throws Exception {
        Key secretKey = keyGenerator(key);
        IvParameterSpec iv = new IvParameterSpec(key.getBytes(CHARSET_NAME));
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        //初始化Cipher對象，設置為解密模式
        cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
        // 執(zhí)行解密操作
        return new String(cipher.doFinal(Base64.decodeBase64(data)));
    }
    public static void main(String[] args) throws Exception {
        String source = "工作模式-->>ECB：電子密碼本模式、CBC：加密分組鏈接模式、CFB：加密反饋模式、OFB：輸出反饋模式";
        System.out.println("原文: " + source);
        String key = "A1B2C3D4A1B2C3D4";
        String encryptData = encrypt(source, key);
        System.out.println("加密后: " + encryptData);
        String decryptData = decrypt(encryptData, key);
        System.out.println("解密后: " + decryptData);
    }
}

    /**
     * 計算簽名
     */
    private static String calculateSign(String source, String accessSecret) throws InvalidKeyException {
        try {
            //HmacSHA256加密
            Mac mac = Mac.getInstance("HmacSHA256");
            mac.init(new SecretKeySpec(accessSecret.getBytes("UTF-8"), "HmacSHA256"));
            byte[] signData = mac.doFinal(source.getBytes("UTF-8"));
            //bas64加密
            return Base64.getEncoder().encodeToString(signData);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("HMAC-SHA1 not supported.");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("UTF-8 not supported.");
        }
 
    }