验签出错，请确认charset参数放在了URL查询字符串中且各参数值使用charset参数指示的字符

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;

}