支付宝：验签出错，建议检查签名字符串或签名私钥与应用公钥是否匹配

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摘录时间：

2020-09-18 17:52:58

springboot项目，公钥证书方式，进行支付宝退款时，支付宝返回：“验签出错，建议检查签名字符串或签名私钥与应用公钥是否匹配”。返回值里面，sub_code值是isv.invalid-signature。

使用AlipayClient的sdkExecute和execute都不好使，改为certificateExecute，问题解决。

以下是我的代码：

        AlipayTradeRefundRequest refundRequest = new AlipayTradeRefundRequest();
        AlipayTradeRefundModel model = new AlipayTradeRefundModel();
        model.setOutTradeNo(paySn);
        model.setRefundAmount(payAmount);
        model.setRefundReason("商品退款");
        refundRequest.setBizModel(model);

        try {
            AlipayTradeRefundResponse response = alipayClient.certificateExecute(refundRequest);
            if (response.isSuccess() && response.getFundChange().equalsIgnoreCase("Y")) {
                // 退款成功
            } else {
                // 退款失败
            }
        } catch (AlipayApiException e) {
            e.printStackTrace();
            log.error(" - aliRefund - ", e);
        }

@Configuration
public class AliPayConfig {

    private final AliPayProperties properties;

    public AliPayConfig(AliPayProperties properties) {
        this.properties = properties;
    }

    @Bean
    public AlipayClient alipayClient() throws AlipayApiException, FileNotFoundException {
        CertAlipayRequest certAlipayRequest = new CertAlipayRequest();
        certAlipayRequest.setServerUrl("https://openapi.alipay.com/gateway.do");
        certAlipayRequest.setAppId(properties.getAppId());
        certAlipayRequest.setPrivateKey(properties.getPrivateKey());
        certAlipayRequest.setFormat("json");
        certAlipayRequest.setCharset(AlipayConstants.CHARSET_UTF8);
        certAlipayRequest.setSignType(AlipayConstants.SIGN_TYPE_RSA2);
        certAlipayRequest.setCertPath(ResourceUtils.getFile(properties.getAppCertPath()).getAbsolutePath());
        certAlipayRequest.setAlipayPublicCertPath(ResourceUtils.getFile(properties.getAlipayCertPath()).getAbsolutePath());
        certAlipayRequest.setRootCertPath(ResourceUtils.getFile(properties.getAlipayRootCertPath()).getAbsolutePath());
        return new DefaultAlipayClient(certAlipayRequest);
    }
}

@Configuration
@ConfigurationProperties(prefix = "alipay")
@Data
public class AliPayProperties {

    private String appId;

    private String privateKey;

    private String notifyUrl;

    private String appCertPath;

    private String alipayCertPath;

    private String alipayRootCertPath;
}