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SpringBoot项目集成支付宝

news 来源：原创 2024/9/19 0:53:08

在 Spring Boot 项目中对接支付宝的第三方支付接口涉及几个主要步骤：集成支付宝 SDK、配置支付宝相关信息、实现支付和退款逻辑。

1. 添加依赖

首先，你需要在项目的 pom.xml 文件中添加支付宝 SDK 的依赖。如果使用 Maven，可以添加如下依赖：

<dependency><groupId>com.alipay.sdk</groupId><artifactId>alipay-sdk-java</artifactId><version>4.14.37.ALL</version> <!-- 使用最新的版本 -->
</dependency>

2. 配置支付宝信息

在 application.properties 或 application.yml 文件中配置支付宝相关的信息，包括商户 ID、应用 ID、私钥和支付宝公钥等。

# application.properties
alipay.app-id=YOUR_APP_ID
alipay.merchant-private-key=YOUR_PRIVATE_KEY
alipay.alipay-public-key=ALIPAY_PUBLIC_KEY
alipay.gateway-url=https://openapi.alipay.com/gateway.do

3. 创建支付服务

创建一个服务类来处理支付宝支付和退款请求。首先是支付请求的构造和发送：

import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.AlipayRequest;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.response.AlipayTradePagePayResponse;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;@Service
public class AlipayService {@Value("${alipay.gateway-url}")private String gatewayUrl;@Value("${alipay.app-id}")private String appId;@Value("${alipay.merchant-private-key}")private String privateKey;@Value("${alipay.alipay-public-key}")private String alipayPublicKey;private AlipayClient alipayClient;public AlipayService() {alipayClient = new DefaultAlipayClient(gatewayUrl,appId,privateKey,"json","UTF-8",alipayPublicKey,"RSA2");}public String createPaymentUrl(String outTradeNo, String totalAmount, String subject) throws AlipayApiException {AlipayTradePagePayRequest request = new AlipayTradePagePayRequest();request.setReturnUrl("http://yourdomain.com/return_url");request.setNotifyUrl("http://yourdomain.com/notify_url");StringBuilder bizContent = new StringBuilder();bizContent.append("{").append("\"out_trade_no\":\"").append(outTradeNo).append("\",").append("\"total_amount\":\"").append(totalAmount).append("\",").append("\"subject\":\"").append(subject).append("\",").append("\"product_code\":\"FAST_INSTANT_TRADE_PAY\"").append("}");request.setBizContent(bizContent.toString());AlipayTradePagePayResponse response = alipayClient.pageExecute(request);if (response.isSuccess()) {return response.getBody(); // 这是支付宝返回的支付页面的 HTML 内容} else {throw new RuntimeException("Alipay request failed: " + response.getSubMsg());}}
}

4. 创建退款服务

退款服务类处理退款请求：

import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.AlipayTradeRefundRequest;
import com.alipay.api.response.AlipayTradeRefundResponse;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;@Service
public class AlipayRefundService {@Value("${alipay.gateway-url}")private String gatewayUrl;@Value("${alipay.app-id}")private String appId;@Value("${alipay.merchant-private-key}")private String privateKey;@Value("${alipay.alipay-public-key}")private String alipayPublicKey;private AlipayClient alipayClient;public AlipayRefundService() {alipayClient = new DefaultAlipayClient(gatewayUrl,appId,privateKey,"json","UTF-8",alipayPublicKey,"RSA2");}public String refund(String outTradeNo, String refundAmount) throws AlipayApiException {AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();request.setBizContent("{"+ "\"out_trade_no\":\"" + outTradeNo + "\","+ "\"refund_amount\":\"" + refundAmount + "\""+ "}");AlipayTradeRefundResponse response = alipayClient.execute(request);if (response.isSuccess()) {return "Refund successful";} else {throw new RuntimeException("Alipay refund failed: " + response.getSubMsg());}}
}

5. 创建控制器

在控制器中创建端点来处理支付和退款请求：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.alipay.api.AlipayApiException;@RestController
public class AlipayController {@Autowiredprivate AlipayService alipayService;@Autowiredprivate AlipayRefundService alipayRefundService;@GetMapping("/pay")public String pay(@RequestParam String outTradeNo, @RequestParam String totalAmount, @RequestParam String subject) {try {String paymentUrl = alipayService.createPaymentUrl(outTradeNo, totalAmount, subject);return paymentUrl; // 返回支付页面的 HTML 内容} catch (AlipayApiException e) {return "Error occurred: " + e.getMessage();}}@PostMapping("/refund")public String refund(@RequestParam String outTradeNo, @RequestParam String refundAmount) {try {return alipayRefundService.refund(outTradeNo, refundAmount);} catch (AlipayApiException e) {return "Error occurred: " + e.getMessage();}}
}

6. 处理异步通知

支付宝支付和退款成功后会向你配置的 notify_url 发送异步通知。你需要在应用中创建一个处理这些通知的端点：

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.AlipayTradeQueryRequest;
import com.alipay.api.response.AlipayTradeQueryResponse;@RestController
public class AlipayNotifyController {@PostMapping("/notify_url")public String notifyUrl(@RequestParam Map<String, String> params) {// 验证通知的真实性// 处理支付或退款成功后的逻辑String outTradeNo = params.get("out_trade_no");// 处理支付逻辑// ...return "success"; // 返回给支付宝，确认收到通知}
}