springBoot解密手机号，返给前端158****1724格式如何实现

以下是使用Spring Boot解密手机号并返回给前端的代码示例：

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class PhoneController {

    @PostMapping("/decryptPhone")
    public String decryptPhone(@RequestBody PhoneInfo phoneInfo) throws Exception {
        String encryptedData = phoneInfo.getEncryptedData();
        String sessionKey = phoneInfo.getSessionKey();
        String iv = phoneInfo.getIv();

        byte[] encryptedByte = Base64.decodeBase64(encryptedData);
        byte[] sessionKeyByte = Base64.decodeBase64(sessionKey);
        byte[] ivByte = Base64.decodeBase64(iv);

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        SecretKeySpec secretKeySpec = new SecretKeySpec(sessionKeyByte, "AES");
        IvParameterSpec ivParameterSpec = new IvParameterSpec(ivByte);
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);

        byte[] decryptedByte = cipher.doFinal(encryptedByte);
        String decryptedData = new String(decryptedByte, "UTF-8");

        JSONObject jsonObject = JSONObject.parseObject(decryptedData);
        String phoneNumber = jsonObject.getString("phoneNumber");
        String purePhoneNumber = jsonObject.getString("purePhoneNumber");
        String countryCode = jsonObject.getString("countryCode");

        String maskedPhoneNumber = purePhoneNumber.substring(0, 3) + "****" + purePhoneNumber.substring(7);

        return maskedPhoneNumber;
    }
}

上述代码中，我们使用了Java的AES加密算法和Base64编码解码工具类来解密用户的手机号。解密后，我们从解密后的JSON对象中获取手机号码，并将其格式化为158****1724的形式，最后将其返回给前端。