接口签名怎么用Java实现

@Controller
public class SignController {
 
    @Autowired
    private ISignService signService;
 
    /**
     * 验证接口签名
     * @param dto
     * @return
     */
    @RequestMapping("/testSign")
    @ResponseBody
    public String sign(@RequestBody SignDTO dto) throws Exception{
        return signService.testSign(dto);
    }
}

@Service
public class SignServiceImpl implements ISignService {
 
    /**
     * 获取发起数据请求的签名数据，可以转为json发起请求，服务端再根据接收到的数据进行签名验证,一致则证明数据传输过程中没有被更改。
     * @return
     * @throws Exception
     */
    public SignDTO  getSignData() throws Exception{
        User user = new User();
        user.setName("测试");
        user.setSex("男");
        String data = JSONUtil.toJsonStr(user);
        //密钥
        String accessKey = "accessKey";
        String secretKey = "secretKey";
        String version = "1.0";
        int encrypt = 1;
        long time = System.currentTimeMillis();
        String nonce = RandomUtil.randomString(4);
        //本地加签
        SignReqParam signReqParam = new SignReqParam(
                accessKey, time, nonce, encrypt, version,
                secretKey, data);
        //数据加密
        data = EncryptUtils.aesEncrypt(data, EncryptUtils.KEY);
        System.out.println("加密后数据：" + data);
        SignDTO dto = new SignDTO();
        dto.setAccessKey(accessKey);
        dto.setVersion(version);
        dto.setEncrypt(encrypt);
        dto.setNonce(nonce);
        dto.setTimestamp(time);
        dto.setSign(signReqParam.getSign());
        dto.setData(data);
        return dto;
    }
 
    /**
     * 返回json字符串，用于postman进行测试数据
     * @return
     * @throws Exception
     */
    public String  getSignDataJson() throws Exception{
        SignDTO dto = getSignData();
        return JSONUtil.toJsonStr(dto);
    }
 
    /**
     * 根据接收到的数据，进行验证接口签名，正确再进行数据处理
     * @param dto
     * @return
     */
    @Override
    public String testSign(SignDTO dto) throws Exception{
        String result = "签名不合法";
        //密钥
        String accessKey = "accessKey";
        String secretKey = "secretKey";
        String version = "1.0";
        int encrypt = 1;
        if(ObjectUtils.isEmpty(dto.getVersion()) || !dto.getVersion().equals(version) || ObjectUtils.isEmpty(dto.getData()) || ObjectUtils.isEmpty(dto.getAccessKey()) || !dto.getAccessKey().equals(accessKey)){
            return result;
        }
        // 解密为字符串
        String data = EncryptUtils.aesDecrypt(dto.getData(), EncryptUtils.KEY);
        System.out.println("解密后数据：" + data);
        //本地加签
        SignReqParam signReqParam = new SignReqParam(
                accessKey, dto.getTimestamp(), dto.getNonce(), encrypt, version,
                secretKey, data);
        //签名对比
        if(dto.getSign().equals(signReqParam.getSign())){
            User user = JSONUtil.toBean(data, User.class);
            System.out.println("接口签名合法,可以处理请求中的用户信息，可以进行一系列数据库操作：" + user.toString());
            result = "接口签名合法";
        }
        return result;
    }
 
 
    public static void main(String[] args) throws Exception {
       SignServiceImpl obj = new SignServiceImpl();
       SignDTO dto =  obj.getSignData();
       String result = obj.testSign(dto);
       System.out.println("接口签名结果：" + result);
    }

@Data
public class SignDTO {
    /*密钥*/
    private String accessKey;
    /*密钥*/
    private String secretKey;
    /*版本*/
    private String version;
    /*加密*/
    private int encrypt;
    /*验签参数*/
    private String nonce;
    /*签名*/
    private String sign;
    /*数据*/
    private String data;
    /*时间戳*/
    private long timestamp;
}

@Data
public class User implements Serializable {
    private String name;
 
    private String sex;
}

Connected to the target VM, address: '127.0.0.1:52259', transport: 'socket'
加密后数据：IkoCXfjUX0dawZkLQlqkcex3TJzzQM9VsLg1UuCSvz4=
获取接口请求数据json：{"data":"IkoCXfjUX0dawZkLQlqkcex3TJzzQM9VsLg1UuCSvz4=","accessKey":"accessKey","encrypt":1,"sign":"49EA679C9ED2C49E7FDB7221ECD5784F","version":"1.0","nonce":"oe9w","timestamp":1622972771180}
加密后数据：IkoCXfjUX0dawZkLQlqkcex3TJzzQM9VsLg1UuCSvz4=
解密后数据：{"sex":"男","name":"测试"}
接口签名合法,可以处理请求中的用户信息，可以进行一系列数据库操作：User(name=测试, sex=男)
接口签名结果：接口签名合法
Disconnected from the target VM, address: '127.0.0.1:52259', transport: 'socket'