针对通知参数时间格式为什么是固定时间格式”YYYY-MM-DDTHH:mm:ss+TIMEZONE“，而不是时间戳的类型呢？

进行签名验证时，获取请求body里的内容只能用输入流获取，如果用一般json工具类转化的会一直签名验证失败，最后真的只是因为时间格式的问题！！

查看很多关于验签示例，其实微信支付SKDK中关于验签已经给出了具体工具类，只需要在构造该工具类时给与正确的参数即可：

引入微信支付SDK

<dependency>

    <groupId>com.github.wechatpay-apiv3</groupId>
    <artifactId>wechatpay-apache-httpclient</artifactId>
    <version>0.2.2</version>

构造微信支付相关配置

@Configuration
public class WXPayConfiguration {

    @Value("${WXPay.app-id}")
    private String appId;
    @Value("${pay.trade.money-virtual-currency-ratio}")
    private Integer ratio;
    @Value("${WXPay.app-private-key}")
    private String appPrivateKey;
    @Value("${WXPay.api-v3-key}")
    private String apiV3Key;
    @Value("${WXPay.mch-serial-no}")
    private String mchSerialNo;
    @Value("${WXPay.charset}")
    private String charset;
    @Value("${WXPay.mch-id}")
    private String mchId;
    @Value("${WXPay.notify-url}")
    private String notifyUrl;
    @Value("${WXPay.native-pay-url}")
    private String nativePayUrl;
    @Value("${file.qrcode.logopath}")
    private String logoPath;

    @Bean
    public HttpClient httpClient(AutoUpdateCertificatesVerifier verifier) throws IOException {
        // 加载商户私钥（privateKey：私钥字符串）
        PrivateKey merchantPrivateKey = PemUtil
                .loadPrivateKey(new ByteArrayInputStream(appPrivateKey.getBytes(charset)));

        // 初始化httpClient
        return WechatPayHttpClientBuilder.create()
                .withMerchant(mchId, mchSerialNo, merchantPrivateKey)
                .withValidator(new WechatPay2Validator(verifier)).build();
    }

    @Bean
    public AutoUpdateCertificatesVerifier verifier() throws UnsupportedEncodingException {
        // 加载商户私钥（privateKey：私钥字符串）
        PrivateKey merchantPrivateKey = PemUtil
                .loadPrivateKey(new ByteArrayInputStream(appPrivateKey.getBytes(charset)));

        // 加载平台证书（mchId：商户号,mchSerialNo：商户证书序列号,apiV3Key：V3秘钥）
        return new AutoUpdateCertificatesVerifier(
                new WechatPay2Credentials(mchId, new PrivateKeySigner(mchSerialNo, merchantPrivateKey)),apiV3Key.getBytes(charset));

    }
}

验证签名

BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));
String body = IOUtils.toString(reader);

//验证签名
String wechatPayTimestamp = request.getHeader("Wechatpay-Timestamp");
String wechatPayNonce = request.getHeader("Wechatpay-Nonce");
String wechatSignature = request.getHeader("Wechatpay-Signature");
String wechatPaySerial = request.getHeader("Wechatpay-Serial");
//签名信息
String signMessage = buildSignMessage(wechatPayTimestamp, wechatPayNonce, body);

// 加载平台证书（mchId：商户号,mchSerialNo：商户证书序列号,apiV3Key：V3秘钥）
boolean verify = verifier.verify(wechatPaySerial, signMessage.getBytes(StandardCharsets.UTF_8), wechatSignature);

解密数据

AesUtil aesUtil = new AesUtil(apiV3Key.getBytes(StandardCharsets.UTF_8));
String decrypt = aesUtil.decryptToString(associated_data.getBytes(StandardCharsets.UTF_8), nonce.getBytes(StandardCharsets.UTF_8), ciphertext);