问题解决，单步调试发现响应的validator和请求使用的不一样，SDK中的withWechatPay这需传递平台密钥而非商户！

以下贴出JAVA SDK需注意事项，没见过这么写SDK的，这些该声明的，不应该是SDK内部要做的事情吗？创意他们抄的很好，但代码，他们连抄都不会！！！！

/*
		敏感信息都需要用平台公钥进行加密，
		RsaCryptoUtil.encryptOAEP("待加密内容", getWechatCertificate(payConfig))
		
		HTTP请求时，header需要带上平台证书信息
		CloseableHttpClient client = getClient(payConfig);
		
		HttpPost httpost = new HttpPost(URL); //
		httpost.addHeader("Content-Type", "application/json"); //这个SDK没有声明
		httpost.addHeader("Wechatpay-Serial",getWechatCertificate(payConfig).getSerialNumber().toString(16));
		
		client.execute(httpost);
		
	 */


	private WechatPayHttpClientBuilder builder = null;
	private CloseableHttpClient getClient(PayConfig payConfig) {


		if (builder == null) {
			List<X509Certificate> certificates = new ArrayList<>();
			certificates.add(getWechatCertificate(payConfig)); // 这里获取平台证书
			builder = WechatPayHttpClientBuilder.create()
					.withMerchant(payConfig.getMerchantId(),payConfig.getMerchantCertificateSerial(), getPrivateKey(payConfig.getMerchantCertificatePath())) //这里需设置商户私钥,私钥可从商户证书中可提取
					.withWechatPay(certificates); //使用平台证书，这个会验证响应信息的签名


		}


		return builder.build();


	}


	// 证书管理器
	private CertificatesManager certificatesManager = null;


	// 此方法用于获取平台证书
	private X509Certificate getWechatCertificate(PayConfig payConfig) { //PayConfig 中存放了商户ID，商户证书文件地址，商户证书编号，商户APIV3密钥，
		if (certificatesManager == null) {
			certificatesManager = CertificatesManager.getInstance();
			try {
				certificatesManager.putMerchant(payConfig.getMerchantId(),
						new WechatPay2Credentials(payConfig.getMerchantId(),
								new PrivateKeySigner(payConfig.getMerchantCertificateSerial(),
										getPrivateKey(payConfig.getMerchantCertificatePath()))),
						payConfig.getMerchantApiV3Key().getBytes(StandardCharsets.UTF_8)); // 注意这里的key，账户中心》API安全》设置APIv3密钥，这个字符串密钥
			} catch (Exception e) {
				logger.error("init wechat certificate manager error.", e);
				throw PlatformError.code(BussErrorCode.PAY_KEY_ERROR);
			}


		}
		try {
			return CertificatesManager.getInstance().getVerifier(payConfig.getMerchantId()).getValidCertificate();
		} catch (NotFoundException e) {
			logger.error("get wechat certificate error.", e);
			throw PlatformError.code(BussErrorCode.PAY_KEY_ERROR);
		}


	}


	private PrivateKey privateKey = null;
	private PrivateKey getPrivateKey(String merchantId, String keyFilePath) {
		if (privateKey != null) {
			return privateKey;
		}
		InputStream inputStream = null;
		char[] keyPassword = merchantId.toCharArray();


		try {
			KeyStore keyStore = KeyStore.getInstance("PKCS12");
			inputStream = new FileInputStream(new File(keyFilePath));
			keyStore.load(inputStream, keyPassword);
			String alias = keyStore.aliases().nextElement(); // 注意要这么获取alias
			X509Certificate certificate = (X509Certificate) keyStore.getCertificate(alias);
			
			return (PrivateKey) keyStore.getKey(alias, keyPassword);
		} catch (Exception e) {
			logger.error("Analyse wechat certificate error.", e);
			throw PlatformError.code(BussErrorCode.PAY_KEY_ERROR);


		} finally {
			if (inputStream != null) {
				try {
					inputStream.close();
				} catch (IOException e) {
				}
			}


		}
	}