前端uni-app，后端使用java，接口加密解密

最近开发一个小程序使用的uni-app做了一些封装

首先是前端

import CryptoJS from 'crypto-js';
const secretKey = "secret-key";

// 统一的请求方法
function request(url, method, data) {
  // 对称加密，这里选用 AES 算法
  const key = CryptoJS.enc.Utf8.parse(secretKey);
  const iv  = CryptoJS.enc.Utf8.parse(secretKey.substring(0, 16));
  const encryptedData = CryptoJS.AES.encrypt(JSON.stringify(data), key, {
    iv,
    mode: CryptoJS.mode.CBC,
    padding: CryptoJS.pad.Pkcs7
  }).toString();
  
  return uni.request({
    url: url,
    method: method,
    header: {
      'content-type': 'application/json'
    },
    data: encryptedData
  }).then(res => {
      // 返回解密后的数据
      const decryptedData = CryptoJS.AES.decrypt(res.data, key, {
        iv,
        mode: CryptoJS.mode.CBC,
        padding: CryptoJS.pad.Pkcs7
      });
      const plaintext = decryptedData.toString(CryptoJS.enc.Utf8);
      return Promise.resolve(JSON.parse(plaintext));
    }).catch(err => {
      console.error('request failed:', err);
      return Promise.reject(err);
    });
}

export { request };

服务端肯定是在拦截器层进行统一的处理

public class DecryptInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        if (handler instanceof HandlerMethod) {
            HandlerMethod handlerMethod = (HandlerMethod) handler;

            Method method = handlerMethod.getMethod();
            Decrypt decryptedData = method.getAnnotation(Decrypt.class);
            if (decryptedData != null) {
                // 从请求体中读取密文数据
                String encryptedData = IOUtils.toString(request.getInputStream(), StandardCharsets.UTF_8);

                // 解密数据
                String plainText = DecryptUtil .decrypt(encryptedData, "your-secret-key");

                // 将明文数据设置到请求体中
                ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
                HttpServletRequest req = attributes.getRequest();
                WrappedHttpServletRequest wrappedReq = new WrappedHttpServletRequest(req);
                wrappedReq.setBody(plainText.getBytes());

                requestContext.setRequest(wrappedReq);
            }
        }

        return true;
    }

}

然后是那几个工具类比如解密的工具类

public class DecryptUtil {

    // 解密方法
    public static String decrypt(String data, String secretKey) {
        try {
            byte[] encryptedData = Base64.decodeBase64(data);
            byte[] key1 = getSubByteArray(secretKey.getBytes(), 0, 16);
            byte[] iv1 = getSubByteArray(secretKey.getBytes(), 0, 16);
            SecretKeySpec secretKeySpec = new SecretKeySpec(key1, "AES");
            IvParameterSpec iv = new IvParameterSpec(iv1);
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, iv);
            return new String(cipher.doFinal(encryptedData));
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }

    // 获取字节数组的子数组
    private static byte[] getSubByteArray(byte[] data, int start, int length) {
        byte[] result = new byte[length];
        System.arraycopy(data, start, result, 0, length);
        return result;
    }
}

写个测试类

@RestController
@RequestMapping("/api")
public class TestController {

    // 加入 Decrypt 注解
  	@PostMapping(value = "/test", consumes = {MediaType.APPLICATION_JSON_VALUE})
    public ResponseEntity test(@RequestBody @Decrypt User user) {
        System.out.println(user);
        return ResponseEntity.ok("success");
    }
}