SpringBoot实现简易支付宝网页支付功能

<!--        aliPay相关SDK-->
<dependency>
    <groupId>com.alipay.sdk</groupId>
    <artifactId>alipay-sdk-java</artifactId>
    <version>4.17.5.ALL</version>
</dependency>
​
<!--        二维码生成器-->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>
</dependency>

import java.io.FileWriter;
import java.io.IOException;
​
public class AlipayConfig {
    
//↓↓↓↓↓↓↓↓↓↓请在这里配置您的基本信息↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
​
    // 应用ID,您的APPID，收款账号既是您的APPID对应支付宝账号
    public static String app_id = "你的APPID";
    
    // 商户私钥，您的PKCS8格式RSA2私钥
    public static String merchant_private_key = "你的私钥";
    
    // 支付宝公钥,查看地址：https://openhome.alipay.com/platform/keyManage.htm 对应APPID下的支付宝公钥。
    public static String alipay_public_key="你的应用公钥";
    // 下面是两个回调地址，指支付成功后用户会跳转到哪些页面，不填也可以
    // 服务器异步通知页面路径  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
    public static String notify_url = "http://工程公网访问地址/alipay.trade.page.pay-JAVA-UTF-8/notify_url.jsp";
    // 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
    public static String return_url = "http://工程公网访问地址/alipay.trade.page.pay-JAVA-UTF-8/return_url.jsp";
​
    // 签名方式
    public static String sign_type = "RSA2";
    
    // 字符编码格式
    public static String charset = "UTF-8";
    
    // 沙箱支付宝网关 正式支付网关是 https://openapi.alipay.com/gateway.do 千万不要混淆了
    public static String gatewayUrl = "https://openapi.alipaydev.com/gateway.do";
    
    // 支付宝网关
    public static String log_path = "C:\\";
​
    // json格式
    public static String format = "json";
​
​
//↑↑↑↑↑↑↑↑↑↑请在这里配置您的基本信息↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑
​
    /** 
     * 写日志，方便测试（看网站需求，也可以改成把记录存入数据库）
     * @param sWord 要写入日志里的文本内容
     */
    public static void logResult(String sWord) {
        FileWriter writer = null;
        try {
            writer = new FileWriter(log_path + "alipay_log_" + System.currentTimeMillis()+".txt");
            writer.write(sWord);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (writer != null) {
                try {
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
​

import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.AlipayTradePagePayRequest;
​
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.data.domain.Pageable;
import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Controller;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;
import io.swagger.annotations.*;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
​
/**
* @website https://el-admin.vip
* @author nijunwei
* @date 2021-10-18
**/
@Controller
@RequestMapping("/api/test")
public class TestController {
​​   
    @GetMapping("/transcation")
    public   void   doPost (HttpServletRequest httpRequest,
                            HttpServletResponse httpResponse)   throws ServletException, IOException  {
        AlipayClient alipayClient =  new DefaultAlipayClient( AlipayConfig.gatewayUrl , AlipayConfig.app_id, AlipayConfig.merchant_private_key,AlipayConfig.format , AlipayConfig.charset, AlipayConfig.alipay_public_key, AlipayConfig.sign_type);  //获得初始化的AlipayClient
        AlipayTradePagePayRequest alipayRequest =  new  AlipayTradePagePayRequest(); //创建API对应的request
​
        //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 = UUID.randomUUID().toString().substring(0,13);
        //付款金额，必填
        String total_amount = new String("88.88");
        //订单名称，必填
        String subject="冬天的第一杯奶茶";
        //商品描述，可空
        String body = new String("我的你的什么？你是我的优乐美");
​
        String bizContent="{\"out_trade_no\":\""+ out_trade_no +"\","
                + "\"total_amount\":\""+ total_amount +"\","
                + "\"subject\":\""+ subject +"\","
                + "\"body\":\""+ body +"\","
                + "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}";
        alipayRequest.setBizContent(bizContent);
  
​
//        alipayRequest.setBizContent(json);
        String form= "" ;
        try  {
            form = alipayClient.pageExecute(alipayRequest).getBody();  //调用SDK生成表单
        }  catch  (AlipayApiException e) {
            e.printStackTrace();
        }
        // 页面刷新会客户端
        httpResponse.setCharacterEncoding("UTF-8");
        httpResponse.setContentType("text/html;charset=UTF-8");
        httpResponse.getWriter().write(form); //直接将完整的表单html输出到页面
        httpResponse.getWriter().flush();
        httpResponse.getWriter().close();
    }
​
}

out_tarde_no:支付单号，用于辨别是否重复确认，支付宝那边会有一套机制防止用户重复支付一个单号的订单。
total_amount:支付金额，单位为元，可达到小数点后两位，如88.88表示88元8角8分。
subject：支付时显示订单标题
body：商品的信息描述
product_code:此处固定为FAST_INSTANT_TRADE_PAY，对于其他代码的含义可查看官方文档

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
​
import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
public class QRCodeGeneratorUtil {
    // 暂定图片路径
    private static final String QR_CODE_IMAGE_PATH = "D:\\eladmin\\eladmin\\QRCodePics\\test.png";
​
    private static void generateQRCodeImage(String text, int width, int height, String filePath) throws WriterException, IOException {
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
​
        BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height);
​
        Path path = FileSystems.getDefault().getPath(filePath);
​
        MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);
​
    }
​
    public static void main(String[] args) {
        try {
            generateQRCodeImage("http://192.168.137.1:8000/api/test/transcation", 350, 350, QR_CODE_IMAGE_PATH);
        } catch (WriterException e) {
            System.out.println("Could not generate QR Code, WriterException :: " + e.getMessage());
        } catch (IOException e) {
            System.out.println("Could not generate QR Code, IOException :: " + e.getMessage());
        }
​
    }
​
}