支付宝退款功能

参考地址：https://opendocs.alipay.com/open/4b7cc5db_alipay.trade.refund?scene=common&pathHash=d98b006d

1、引入依赖

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

2、创建一个配置文件放支付宝支付的《必需参数》

alipay:
# alipay_url: https://openapi.alipay.com/gateway.do # 真实支付的url
  alipay_url: https://openapi-sandbox.dl.alipaydev.com/gateway.do  # 沙箱的url
  app_id: # APPID
  app_private_key: # 应用私钥
  alipay_public_key: # 支付宝公钥
  format: json # 数据格式
  charset: utf-8 # 编码格式
  sign_type: RSA2 # 加密方式
  return_payment_url:  # 通知地址，支付成功后点击完成后，会调用该路径接口。
  notify_payment_url:  # 异步通知地址，用于接收支付宝推送给商户的支付/退款成功的消息。
  return_order_url:   # 重定向地址，支付成功后点击完成后，会《重定向自动跳转回》商家页面地址。

3、创建一个类调用支付宝支付API，并获取配置文件值

package com.spzx.payment.configure;

import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AlipayConfig {

    // 支付宝网关地址
    @Value("${alipay.alipay_url}")
    private String alipay_url;
    
    // 应用的私钥
    @Value("${alipay.app_private_key}")
    private String app_private_key;
    
    // 支付宝的appId
    @Value("${alipay.app_id}")
    private String app_id;


    public final static String format="json";
    public final static String charset="utf-8";
    public final static String sign_type="RSA2";


    public static String return_payment_url;

    public static  String notify_payment_url;

    public static  String return_order_url;

    public static  String alipay_public_key;

    @Value("${alipay.alipay_public_key}")
    public   void setAlipay_public_key(String alipay_public_key) {
        AlipayConfig.alipay_public_key = alipay_public_key;
    }

    @Value("${alipay.return_payment_url}")
    public   void setReturn_url(String return_payment_url) {
        AlipayConfig.return_payment_url = return_payment_url;
    }

    @Value("${alipay.notify_payment_url}")
    public   void setNotify_url(String notify_payment_url) {
        AlipayConfig.notify_payment_url = notify_payment_url;
    }

    @Value("${alipay.return_order_url}")
    public   void setReturn_order_url(String return_order_url) {
        AlipayConfig.return_order_url = return_order_url;
    }

	// 创建一个client对象
    @Bean
    public AlipayClient alipayClient(){
        AlipayClient alipayClient=new DefaultAlipayClient(alipay_url,app_id,app_private_key,format,charset, alipay_public_key,sign_type );
        return alipayClient;
    }

}

4、使用支付宝退款

https://opendocs.alipay.com/open/4b7cc5db_alipay.trade.refund?scene=common&pathHash=d98b006d

@Autowired
private AlipayConfig alipauConfig
@Override
public String AlipayTradeRefund(String orderNo){
    //调用支付宝的退款接口
    //支付宝退款接口对应的request AlipayTradeRefundRequest
    AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();
    
    //用于封装参数
    AlipayTradeRefundModel model = new AlipayTradeRefundModel();
    
	// 设置商户订单号
    model.setOutTradeNo("20150320010101001");
	// 设置支付宝交易号
    model.setTradeNo("2014112611001004680073956707");  
    // 设置退款金额
    model.setRefundAmount("200.12");
 	// 设置退款原因说明
    model.setRefundReason("正常退款");
	// 设置退款请求号
	model.setOutRequestNo("HZ01RF001");
    
    request.setBizModel(model);
    
    try {
        //调用支付宝退款接口
         AlipayTradeRefundResponse response = alipayClient.execute(request);
         boolean success = response.isSuccess();
         if (!success){
             throw new ServiceException("退款接口调用失败");
          }
      } catch (AlipayApiException e) {
            throw new RuntimeException(e);
    }
}