前言

本文使用SpringBoot+SpringMVC对接支付宝电脑网站支付接口。接下来将详细讲解开发步骤及一些常见问题。

1.首先打开支付宝开放平台,

2.点击研发服务。因为正式接入需要企业签约，所以我们这里先用沙盒模式进行模拟接入，完成签约后将程序中的部分参数替换即可。

3.点击沙盒应用，查看APPID等参数

4.设置RSA2密钥

使用官方密钥生成工具生成密钥,将生成的密钥填入

时序图

正式开发

依赖pom.xml

org.springframework.boot

spring-boot-starter-parent

2.2.4.RELEASE

org.springframework.boot

spring-boot-starter-web

org.springframework.boot

spring-boot-devtools

runtime

true

org.projectlombok

lombok

true

org.springframework.boot

spring-boot-starter-thymeleaf

2.2.4.RELEASE

org.springframework.boot

spring-boot-starter-test

test

org.junit.vintage

junit-vintage-engine

com.alipay.sdk

alipay-sdk-java

4.10.124.ALL

目录层级

关键代码

AlipayConfig类

创建DefaultAlipayClient所需参数，文档中提及DefaultAlipayClient只需要创建一次，后续可直接调用，所以这里使用了双重校验锁方式创建单例对象。

如果不清楚双重校验锁的朋友可以看这篇博客：双重校验锁

package online.xybh.pay_demo.pay.alipay;

import com.alipay.api.AlipayClient;

import com.alipay.api.DefaultAlipayClient;

import org.springframework.stereotype.Component;

@Component

public class AlipayConfig {

/**

* 支付宝网关(https://openapi.alipay.com/gateway.do)

* 沙盒网关(https://openapi.alipaydev.com/gateway.do)

*/

public static String URL = "https://openapi.alipaydev.com/gateway.do";

/**

* 创建应用时产生的应用号

*/

public static String APP_ID = "你的APPID";

/**

* 开发者私钥

*/

public static String APP_PRIVATE_KEY = "你的开发者私钥";

/**

* 参数返回格式, 只支持json

*/

public static String FORMAT = "json";

/**

* 编码集,支持GBK/UTF-8,根据自己工程编码进行调整

*/

public static String CHARSET = "UTF-8";

/**

* 支付宝公钥

*/

public static String ALIPAY_PUBLIC_KEY = "你的支付宝公钥";

/**

* 签名算法类型

*/

public static String SIGN_TYPE = "RSA2";

/**

* 回调地址

*/

public static String RETURN_URL = "你的回调地址";

/**

* 异步通知地址

*/

public static String NOTIFY_URL;

/**

* 私有化构造方法

*/

private AlipayConfig(){}

private volatile static AlipayClient instance = null;

/**

* 双重校验锁,单例模式

* @return 支付宝请求客户端实例

*/

public static AlipayClient getInstance(){

if(instance == null){

synchronized (AlipayConfig.class){

if(instance == null){

instance = new DefaultAlipayClient(URL, APP_ID, APP_PRIVATE_KEY, FORMAT, CHARSET, ALIPAY_PUBLIC_KEY, SIGN_TYPE);

}

}

}

return instance;

}

}

AlipayTrade类

这个类主要完成与支付宝的常用对接，如支付，退款，查询是否成功支付等。这里我们只完成支付功能。

package online.xybh.pay_demo.pay.alipay;

import com.alibaba.fastjson.JSON;

import com.alipay.api.AlipayApiException;

import com.alipay.api.request.AlipayTradePagePayRequest;

import lombok.extern.slf4j.Slf4j;

import org.springframework.stereotype.Component;

import java.util.Map;

@Slf4j

@Component

public class AlipayTrade {

public String trade(Map content){

AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();

alipayRequest.setReturnUrl(AlipayConfig.RETURN_URL);

alipayRequest.setBizContent(JSON.toJSONString(content));

String form = "";

try {

form = AlipayConfig.getInstance().pageExecute(alipayRequest).getBody();

} catch (AlipayApiException e) {

log.error("支付宝构建表单失败", e);

}

log.debug("支付宝构建表单"+form);

return form;

}

}

这里用来lombok中的Slf4j注解，如果不需要的话可以与下面的log.error,log.debug一同删除。

Service

PayService接口

package online.xybh.pay_demo.service;

public interface PayService {

/**

* @param total 订单总金额

* @param subject 订单标题

* @param body 订单详情

* @param goodsId 商品id

* @param goodsName 商品名

* @param quantity 数量

* @param price 单价

* @return 支付表单

*/

String pay(double total, String subject, String body, String goodsId, String goodsName, int quantity, double price);

}

这里只写了一部分常用参数,如需其他参数可看alipay.trade.page.pay

PayServiceImpl实现类

package online.xybh.pay_demo.service.impl;

import online.xybh.pay_demo.pay.alipay.AlipayTrade;

import online.xybh.pay_demo.service.PayService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import java.util.HashMap;

import java.util.UUID;

@Service

public class PayServiceImpl implements PayService {

@Autowired

private AlipayTrade alipayTrade;

@Override

public String pay(double total, String subject, String body, String goodsId, String goodsName, int quantity, double price){

HashMap content = new HashMap<>();

content.put("out_trade_no", UUID.randomUUID().toString());

content.put("product_code", "FAST_INSTANT_TRADE_PAY");

content.put("total_amount", String.valueOf(total));

content.put("subject", subject);

content.put("body", body);

content.put("goods_id", goodsId);

content.put("goods_name", goodsName);

content.put("quantity", String.valueOf(quantity));

content.put("price", String.valueOf(price));

return alipayTrade.trade(content);

}

}

测试

首页 IndexController

package online.xybh.pay_demo.controller;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

public class IndexController {

@RequestMapping({"/", "/index"})

public String index(Model model){

return "index";

}

}

支付 PayController

package online.xybh.pay_demo.controller;

import online.xybh.pay_demo.service.PayService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

@Controller

public class PayController {

@Autowired

private PayService payService;

@PostMapping("/pay")

public String pay(@RequestParam String subject,

@RequestParam String body,

@RequestParam String goodsId,

@RequestParam String goodsName,

@RequestParam int quantity,

@RequestParam double price,

HttpServletResponse response){

String form = payService.pay(quantity*price, subject, body, goodsId, goodsName, quantity, price);

response.setContentType("text/html;charset=" + "UTF8");

try {

response.getWriter().write(form);

response.getWriter().flush();

response.getWriter().close();

} catch (IOException e) {

e.printStackTrace();

}

return "callback";

}

}

回调 CallBackController

package online.xybh.pay_demo.controller;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.GetMapping;

@Controller

public class CallBackController {

@GetMapping("CallBack/alipay_back")

public String callback(){

return "/callback";

}

}

index.html

Title

订单标题:
订单描述:
商品编号:
商品名称:
商品数量:
商品单价:

实现效果

1.商品详情

2.支付页面