手把手教你如何对接支付宝支付接口（奶爸级别）

步骤：

第一步：准备支付宝相关的参数，如appId、公私钥

第二步：写代码，搞起

第一步：

1.你需要登录支付宝https://open.alipay.com/platform/developerIndex.htm。

2.点击控制台—>研发服务

3.到这个地址上生成一对公私钥：https://miniu.alipay.com/keytool/create

4.私钥保存下来，是要放在项目配置里面的，公钥是下面的步骤要用到的。
5.复制上面的公钥，放到这个输入框里面
6.保存设置后，打开就可以看到这样的窗口，下面的【敲黑板了！！！支付宝公钥】是放在代码里面的，自己保存下来。

7.点击左边的【沙箱账号】，把账号密码保存下来，支付的时候要用到。

8.到了这一步，咱们所需要的配置基本上就准备齐了

请看配置

# 应用ID，您的APPID
alipay.appId=2021xxxx
# 支付宝公私钥生成地址：https://miniu.alipay.com/keytool/create
# 商户私钥，您的PKCS8格式RSA2私钥
alipay.merchantPrivateKey=第一次生成的私钥
# 支付宝公钥，查看地址：https://openhome.alipay.com/platform/keyManage.htm
alipay.alipayPublicKey=支付宝公钥
# 页面跳转异步通知页面路径，需http://格式的完整路径，不能加?id=123这类自定义参数，必须外网可以正常访问
alipay.notifyUrl=http://5ktbak.natappfree.cc/payment/alipay
# 页面跳转同步通知页面路径，需http://格式的完整路径，不能加?id=123这类自定义参数，必须外网可以正常访问
alipay.returnUrl=http://5ktbak.natappfree.cc/alipayResult# 签名方式
alipay.signType=RSA2
# 字符编码格式
alipay.charset=utf-8
# 支付宝网关
alipay.gatewayUrl=https://openapi.alipaydev.com/gateway.do

第二步

alipay.properties

# 应用ID，您的APPID
alipay.appId=2021xxxx
# 支付宝公私钥生成地址：https://miniu.alipay.com/keytool/create
# 商户私钥，您的PKCS8格式RSA2私钥
alipay.merchantPrivateKey=第一次生成的私钥
# 支付宝公钥，查看地址：https://openhome.alipay.com/platform/keyManage.htm
alipay.alipayPublicKey=支付宝公钥
# 页面跳转异步通知页面路径，需http://格式的完整路径，不能加?id=123这类自定义参数，必须外网可以正常访问
alipay.notifyUrl=http://5ktbak.natappfree.cc/payment/alipay
# 页面跳转同步通知页面路径，需http://格式的完整路径，不能加?id=123这类自定义参数，必须外网可以正常访问
alipay.returnUrl=http://5ktbak.natappfree.cc/alipayResult# 签名方式
alipay.signType=RSA2
# 字符编码格式
alipay.charset=utf-8
# 支付宝网关
alipay.gatewayUrl=https://openapi.alipaydev.com/gateway.do

AliPayResource.java

package com.alipay.resource;import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;@Data
@Component
@ConfigurationProperties(prefix="alipay")
@PropertySource("classpath:alipay.properties")
public class AliPayResource {private String appId;private String merchantPrivateKey;private String alipayPublicKey;private String notifyUrl;private String returnUrl;private String signType;private String charset;private String gatewayUrl;
}

AlipayController.java

package com.alipay.controller;import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.internal.util.AlipaySignature;
import com.alipay.api.request.AlipayTradePagePayRequest;
import com.alipay.resource.AliPayResource;
import com.alipay.utils.DateUtil;
import com.alipay.utils.JsonResult;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;/*** @author: HuGoldWater* @description:*/
@Slf4j
@RestController
@RequestMapping("payment")
public class AlipayController {@Autowiredprivate AliPayResource aliPayResource;/*** 前往支付宝进行支付*/@GetMapping(value="/goAlipay")public JsonResult goAlipay(String merchantUserId, String merchantOrderId) throws Exception{//获得初始化的AlipayClientAlipayClient alipayClient = new DefaultAlipayClient(aliPayResource.getGatewayUrl(),aliPayResource.getAppId(),aliPayResource.getMerchantPrivateKey(),"json",aliPayResource.getCharset(),aliPayResource.getAlipayPublicKey(),aliPayResource.getSignType());//设置请求参数AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();alipayRequest.setReturnUrl(aliPayResource.getReturnUrl());alipayRequest.setNotifyUrl(aliPayResource.getNotifyUrl());// 商户订单号, 商户网站订单系统中唯一订单号, 必填String out_trade_no = merchantOrderId;// 付款金额, 必填 单位元String total_amount = "0.01";  // 测试用 1分钱// 订单名称, 必填String subject = "胡金水-付款用户[" + merchantUserId + "]";// 商品描述, 可空, 目前先用订单名称String body = subject;// 该笔订单允许的最晚付款时间，逾期将关闭交易。取值范围：1m～15d。m-分钟，h-小时，d-天，1c-当天（1c-当天的情况下，无论交易何时创建，都在0点关闭）。 该参数数值不接受小数点， 如 1.5h，可转换为 90m。String timeout_express = "1h";alipayRequest.setBizContent("{\"out_trade_no\":\""+ out_trade_no +"\","+ "\"total_amount\":\""+ total_amount +"\","+ "\"subject\":\""+ subject +"\","+ "\"body\":\""+ body +"\","+ "\"timeout_express\":\""+ timeout_express +"\","+ "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");//请求String alipayForm = "";try {alipayForm = alipayClient.pageExecute(alipayRequest).getBody();} catch (AlipayApiException e) {e.printStackTrace();}log.info("支付宝支付 - 前往支付页面, alipayForm: \n{}", alipayForm);return JsonResult.ok(alipayForm);}/*** 支付成功后的支付宝异步通知*/@RequestMapping(value="/alipay")public String alipay(HttpServletRequest request, HttpServletResponse response) throws Exception {log.info("支付成功后的支付宝异步通知");//获取支付宝POST过来反馈信息Map<String,String> params = new HashMap<String,String>();Map<String,String[]> requestParams = request.getParameterMap();for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext();) {String name = (String) iter.next();String[] values = (String[]) requestParams.get(name);String valueStr = "";for (int i = 0; i < values.length; i++) {valueStr = (i == values.length - 1) ? valueStr + values[i]: valueStr + values[i] + ",";}//乱码解决，这段代码在出现乱码时使用
//       valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8");params.put(name, valueStr);}boolean signVerified = AlipaySignature.rsaCheckV1(params,aliPayResource.getAlipayPublicKey(),aliPayResource.getCharset(),aliPayResource.getSignType()); //调用SDK验证签名if(signVerified) {//验证成功// 商户订单号String out_trade_no = new String(request.getParameter("out_trade_no").getBytes("ISO-8859-1"),"UTF-8");// 支付宝交易号String trade_no = new String(request.getParameter("trade_no").getBytes("ISO-8859-1"),"UTF-8");// 交易状态String trade_status = new String(request.getParameter("trade_status").getBytes("ISO-8859-1"),"UTF-8");// 付款金额String total_amount = new String(request.getParameter("total_amount").getBytes("ISO-8859-1"),"UTF-8");if (trade_status.equals("TRADE_SUCCESS")){//                String merchantReturnUrl = paymentOrderService.updateOrderPaid(out_trade_no, CurrencyUtils.getYuan2Fen(total_amount));
//                notifyFoodieShop(out_trade_no,merchantReturnUrl);}log.info("************* 支付成功(支付宝异步通知) - 时间: {} *************", DateUtil.getCurrentDateString(DateUtil.DATETIME_PATTERN));log.info("* 订单号: {}", out_trade_no);log.info("* 支付宝交易号: {}", trade_no);log.info("* 实付金额: {}", total_amount);log.info("* 交易状态: {}", trade_status);log.info("*****************************************************************************");return "success";}else {//验证失败log.info("验签失败, 时间: {}", DateUtil.getCurrentDateString(DateUtil.DATETIME_PATTERN));return "fail";}}}

Application.java

package com.alipay;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}}

运行Application，在页面输入localhost:9090/payment/goAlipay?merchantUserId=123456&merchantOrderId=654321

结果如下：

五月 08, 2021 11:30:51 下午 org.apache.catalina.core.ApplicationContext log
信息: Initializing Spring DispatcherServlet 'dispatcherServlet'
INFO  DispatcherServlet:525 - Initializing Servlet 'dispatcherServlet'
INFO  DispatcherServlet:547 - Completed initialization in 3 ms
INFO  AlipayController:80 - 支付宝支付 - 前往支付页面, alipayForm:
<form name="punchout_form" method="post" action="https://openapi.alipaydev.com/gateway.do?charset=utf-8&method=alipay.trade.page.pay&sign=0G7TbOfYZn8BS1dYY%2FITfZLBHgz%2F0uBz3XU4ndiw%2Fpd%2BADurlNMtYNugvZpGTjrL4JBJb%2Fgzl6vG%2B9urFCbeLiVDXhnGMIvqzXOY67YVGIMfIDxR%2BOytOzZ3zctPeEVHDZBAjRNy4aOqW1elJ491Q%2BptPNT2X3vy8Qts0Ago1HaOyoCRlFag5nB3fwD5t3NQz4ZCEG8slwERixJnN2sIQLj4NGI2bM2T6x8ayDtehRC89hwXJ1ZY9IyLVkwhby%2BW4HU2LiQ%2BqD%2FOKLmxsC65M5pWNF7vw9uswmEuN5qBswJ5rqlTl6iyYd5EKK2Xqhj6hCQYz0IMR1cymRhqDoPG1Q%3D%3D&return_url=http%3A%2F%2F5ktbak.natappfree.cc%2FalipayResult&notify_url=http%3A%2F%2F5ktbak.natappfree.cc%2Fpayment%2Falipay&version=1.0&app_id=2021000117651511&sign_type=RSA2&timestamp=2021-05-08+23%3A30%3A51&alipay_sdk=alipay-sdk-java-3.7.110.ALL&format=json">
<input type="hidden" name="biz_content" value="{&quot;out_trade_no&quot;:&quot;654321&quot;,&quot;total_amount&quot;:&quot;0.01&quot;,&quot;subject&quot;:&quot;胡金水-付款用户[123456]&quot;,&quot;body&quot;:&quot;胡金水-付款用户[123456]&quot;,&quot;timeout_express&quot;:&quot;1h&quot;,&quot;product_code&quot;:&quot;FAST_INSTANT_TRADE_PAY&quot;}">
<input type="submit" value="立即支付" style="display:none" >
</form>
<script>document.forms[0].submit();</script>

把上面的html代码放到html文件中：

<form name="punchout_form" method="post" action="https://openapi.alipaydev.com/gateway.do?charset=utf-8&method=alipay.trade.page.pay&sign=0G7TbOfYZn8BS1dYY%2FITfZLBHgz%2F0uBz3XU4ndiw%2Fpd%2BADurlNMtYNugvZpGTjrL4JBJb%2Fgzl6vG%2B9urFCbeLiVDXhnGMIvqzXOY67YVGIMfIDxR%2BOytOzZ3zctPeEVHDZBAjRNy4aOqW1elJ491Q%2BptPNT2X3vy8Qts0Ago1HaOyoCRlFag5nB3fwD5t3NQz4ZCEG8slwERixJnN2sIQLj4NGI2bM2T6x8ayDtehRC89hwXJ1ZY9IyLVkwhby%2BW4HU2LiQ%2BqD%2FOKLmxsC65M5pWNF7vw9uswmEuN5qBswJ5rqlTl6iyYd5EKK2Xqhj6hCQYz0IMR1cymRhqDoPG1Q%3D%3D&return_url=http%3A%2F%2F5ktbak.natappfree.cc%2FalipayResult&notify_url=http%3A%2F%2F5ktbak.natappfree.cc%2Fpayment%2Falipay&version=1.0&app_id=2021000117651511&sign_type=RSA2&timestamp=2021-05-08+23%3A30%3A51&alipay_sdk=alipay-sdk-java-3.7.110.ALL&format=json"><input type="hidden" name="biz_content" value="{&quot;out_trade_no&quot;:&quot;654321&quot;,&quot;total_amount&quot;:&quot;0.01&quot;,&quot;subject&quot;:&quot;胡金水-付款用户[123456]&quot;,&quot;body&quot;:&quot;胡金水-付款用户[123456]&quot;,&quot;timeout_express&quot;:&quot;1h&quot;,&quot;product_code&quot;:&quot;FAST_INSTANT_TRADE_PAY&quot;}"><input type="submit" value="立即支付" style="display:none" >
</form>
<script>document.forms[0].submit();</script>

打开html文件后,会进入这个页面：

输入沙箱的账号密码：

输入密码后，就已经付款完成了，控制台会打印支付成功的回调通知。

INFO  AlipayController:91 - 支付成功后的支付宝异步通知
INFO  AlipayController:129 - ************* 支付成功(支付宝异步通知) - 时间: 2021-05-09 00:09:32 *************
INFO  AlipayController:130 - * 订单号: 123123123123
INFO  AlipayController:131 - * 支付宝交易号: 2021050922001489970501658602
INFO  AlipayController:132 - * 实付金额: 0.01
INFO  AlipayController:133 - * 交易状态: TRADE_SUCCESS
INFO  AlipayController:134 - *****************************************************************************

如何让支付宝将付款成功的通知，回调到你本机，我使用的是内网穿透：Natapp，可以看到另一篇文章：https://blog.csdn.net/qq_17555933/article/details/116549415

源码地址：

链接: https://pan.baidu.com/s/1cgNiqa5gZoJcaHlikqm_XA 提取码: 16f7