支付宝支付

准备

• pom.xml

<dependency>
    <groupId>com.alipay.sdk</groupId>
    <artifactId>alipay-sdk-java</artifactId>
    <version>4.31.24.ALL</version>
</dependency>

• application.yml

#支付宝
alipay:
  appId: xxx
  format: json
  charset: utf-8
  signType: RSA2
  # 支付宝公钥
  aliAppPublicKey: xxx
  privateKey: xxx
  userInfoServerUrl: https://openapi.alipay.com/gateway.do
  # 支付回调相关
  # payOneNotifyUrl: https://abc.com/test1 #支付通知
  # payTwoNotifyUrl: https://abc.com/test2 #支付通知
  # 退款回调
  # refundUrl: https://abc.com/test3

• alipayConfig.java

@Data
@Component
@ConfigurationProperties(prefix = "alipay")
public class AlipayConfig {
    private String appId;
    private String format;
    private String charset;
    private String signType;
    private String privateKey;
    private String aliAppPublicKey;
    private String userInfoServerUrl;
}

• alipay 客户端

@Configuration
class AlipayClientInstance {
    @Resource
    AlipayConfig alipayConfig;

    @Bean
    public AlipayClient alipayClient() {
        //String serverUrl, String appId, String privateKey, String format,String charset, String alipayPublicKey, String signType
        //实例化客户端 参数：正式环境URL,Appid,商户私钥 PKCS8格式,字符编码格式,字符格式,支付宝公钥,签名方式
        return new DefaultAlipayClient(
                alipayConfig.getAppId(),
                alipayConfig.getFormat(),
                alipayConfig.getCharset(),
                alipayConfig.getSignType(),
                alipayConfig.getPrivateKey(),
                alipayConfig.getAliAppPublicKey(),
                alipayConfig.getUserInfoServerUrl());
    }
}

支付实现

@Component
public class AlipayService {

    @Resource
    private AlipayClient alipayClient;


    /**
     * 统一收单交易创建接口
     *
     * @param totalAmount 总金额，单位为分
     * @param outTradeNo  商户订单号
     * @param userId      支付宝用户id
     * @param subject     订单标题。 注意：不可使用特殊字符，如 /，=，& 等。
     * @param notifyUrl   通知地址
     * @return 支付宝交易号以及商户订单号
     */
    public AlipayTradeCreateResponse tradeCreate(Integer totalAmount, String outTradeNo, String userId, String subject, String notifyUrl) {
        //实例化具体API对应的request类,类名称和接口名称对应,当前调用接口名称：alipay.trade.create.
        AlipayTradeCreateRequest request = new AlipayTradeCreateRequest();
        //SDK已经封装掉了公共参数，这里只需要传入业务参数。
        JSONObject json = new JSONObject();
        //雪花算法订单号
//        long l = IdUtil.getSnowflake().nextId();
//        String outTradeNo =String.valueOf(l);
        //订单号
        json.set("out_trade_no", outTradeNo);
        json.set("total_amount", BigDecimal.valueOf(totalAmount).divide(BigDecimal.valueOf(100), 2, BigDecimal.ROUND_HALF_UP).toString());
        //描述
        json.set("subject", subject);
        //用户唯一标识id 这里必须使用buyer_id 参考文档
        json.set("buyer_id", userId);
        json.set("body", userId);
        //对象转化为json字符串
        String jsonStr = json.toString();
        //商户通过该接口进行交易的创建下单
        request.setBizContent(jsonStr);
        //回调地址 是能够访问到的域名加上方法名
        request.setNotifyUrl(notifyUrl);
        try {
            AlipayTradeCreateResponse response = alipayClient.execute(request);
            if (response.isSuccess()) {
                return response;
            } else {
                throw new BusinessException("调用支付宝创建订单接口失败，原因为：" + response.getMsg());
            }
        } catch (AlipayApiException e) {
            throw new BusinessException("创建订单异常，原因为：" + e.getMessage());
        }
    }

    /**
     * @param outTradeNo   商户单号
     * @param totalAmount  单位分
     * @param refundReason 退款原因
     * @return
     */
    public AlipayTradeRefundResponse alipayRefund(String outTradeNo, Integer totalAmount, String refundReason, String notifyUrl) {
        AlipayTradeRefundRequest alipayTradeRefundRequest = new AlipayTradeRefundRequest();
        //构造退款的参数
        AlipayTradeRefundModel model = new AlipayTradeRefundModel();
        //订单号 这里的订单号是自己生成的 和支付宝系统的订单号TradeNo只能二选一
        model.setOutTradeNo(outTradeNo);
        //金额
        model.setRefundAmount(BigDecimal.valueOf(totalAmount).divide(BigDecimal.valueOf(100), 2, BigDecimal.ROUND_HALF_UP).toString());
        //退款原因
        model.setRefundReason(refundReason);
        //退款请求
        //参数set到请求里
        alipayTradeRefundRequest.setBizModel(model);
        alipayTradeRefundRequest.setNotifyUrl(notifyUrl);
        try {
            return alipayClient.execute(alipayTradeRefundRequest);
        } catch (AlipayApiException e) {
            throw new BusinessException("退费异常：" + e.getMessage());
        }
    }
}