结合springboot实现，这里对接的是easy版本，工具用的是IDEA，WebStrom 支付宝沙箱服务 _生活百科

一：打开支付宝开发平台，登录，然后点击控制台
https://open.alipay.com/

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二：滚动到底部，选着沙箱服务

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三：获取到对接要用的appId和公钥私钥

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四：打开IDEA导入所需的xml文件
<dependency><groupId>com.alipay.sdk</groupId><artifactId>alipay-easysdk</artifactId><version>2.2.0</version></dependency>五：编写实体类：
import lombok.Data;@Datapublic class Alipay {private String traceNo;private String totalAmount;private String subject;private String alipayTraceNo;}六：编写yaml文件（这里的回调要用网络https服务，这里建议使用花生壳可以完成域名访问?。?
#支付宝配置alipay:appId: ？#私钥appPrivateKey: ？#公钥alipayPublicKey: ？#回调地址notifyUrl: ？七：编写服务类：
import com.alipay.easysdk.factory.Factory;import com.alipay.easysdk.kernel.Config;import lombok.Data;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.stereotype.Component;import javax.annotation.PostConstruct;@Data@Component@ConfigurationProperties(prefix = "alipay")public class AplipayConfig {private String appId;private String appPrivateKey;private String alipayPublicKey;private String notifyUrl;@PostConstructpublic void init() {// 设置参数（全局只需设置一次）Config config = new Config();config.protocol = "https";config.gatewayHost = "openapi.alipaydev.com";config.signType = "RSA2";config.appId = this.appId;config.merchantPrivateKey = this.appPrivateKey;config.alipayPublicKey = this.alipayPublicKey;config.notifyUrl = this.notifyUrl;Factory.setOptions(config);System.out.println("=======支付宝SDK初始化成功=======");}}八：编写控制器（写完控制器建议直接测试访问看看可不可以访问的到，链接在第九步）
import com.alipay.easysdk.factory.Factory;import com.alipay.easysdk.payment.page.models.AlipayTradePagePayResponse;import com.rookie.sixthbackstage.entity.Alipay;import com.rookie.sixthbackstage.entity.OrderItem;import com.rookie.sixthbackstage.mapper.OrderItemMapper;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.RequestMapping;import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletRequest;import java.net.URLEncoder;import java.util.HashMap;import java.util.Map;@RestController@RequestMapping("/alipay")public class AliPayController {@AutowiredOrderItemMapper orderItemMapper;@GetMapping("/alipay") // &subject=xxx&traceNo=xxx&totalAmount=xxxpublic String pay(Alipay aliPay) {AlipayTradePagePayResponse response;try {//发起API调用（以创建当面付收款二维码为例）response = Factory.Payment.Page().pay(URLEncoder.encode(aliPay.getSubject(), "UTF-8"), aliPay.getTraceNo(), aliPay.getTotalAmount(), "《这里放支付成功的地址！》");} catch (Exception e) {System.err.println("调用遭遇异常，原因：" + e.getMessage());throw new RuntimeException(e.getMessage(), e);}return response.getBody();}@PostMapping("/notify")// 注意这里必须是POST接口public String payNotify(HttpServletRequest request) throws Exception {if (request.getParameter("trade_status").equals("TRADE_SUCCESS")) {System.out.println("=========支付宝异步回调========");Map<String, String> params = new HashMap<>();Map<String, String[]> requestParams = request.getParameterMap();for (String name : requestParams.keySet()) {params.put(name, request.getParameter(name));// System.out.println(name + " = " + request.getParameter(name));}int tradeNo = Integer.parseInt(params.get("out_trade_no"));String gmtPayment = params.get("gmt_payment");String alipayTradeNo = params.get("trade_no");double pay_price= Double.parseDouble(params.get("buyer_pay_amount"));// 支付宝验签if (Factory.Payment.Common().verifyNotify(params)) {// 验签通过System.out.println("交易名称: " + params.get("subject"));System.out.println("交易状态: " + params.get("trade_status"));System.out.println("支付宝交易凭证号: " + params.get("trade_no"));System.out.println("商户订单号: " + params.get("out_trade_no"));System.out.println("交易金额: " + params.get("total_amount"));System.out.println("买家在支付宝唯一id: " + params.get("buyer_id"));System.out.println("买家付款时间: " + params.get("gmt_payment"));System.out.println("买家付款金额: " + params.get("buyer_pay_amount"));// 支付成功后，修改自己的订单状态，这里的方法是我自己写的，根据自己实际情况来做更改OrderItem orderItem=new OrderItem(0,tradeNo,0,pay_price,gmtPayment,"","已支付");orderItemMapper.updateOrderItemById(orderItem);}}return "success";}}