使用 Java SDK

1implementation 'com.github.wechatpay-apiv3:wechatpay-java:${VERSION}'

1<dependency>
2  <groupId>com.github.wechatpay-apiv3</groupId>
3  <artifactId>wechatpay-java</artifactId>
4  <version>${VERSION}</version>
5</dependency>

1package com.wechat.pay.java.service;
2import com.wechat.pay.java.core.Config;
3import com.wechat.pay.java.core.RSAAutoCertificateConfig;
4import com.wechat.pay.java.service.payments.nativepay.NativePayService;
5import com.wechat.pay.java.service.payments.nativepay.model.Amount;
6import com.wechat.pay.java.service.payments.nativepay.model.PrepayRequest;
7import com.wechat.pay.java.service.payments.nativepay.model.PrepayResponse;
8/** Native 支付下单为例 */
9public class QuickStart {
10    /** 商户号 */
11    public static String merchantId = "190000****";
12    /** 商户API私钥路径 */
13    public static String privateKeyPath = "/Users/yourname/your/path/apiclient_key.pem";
14    /** 商户证书序列号 */
15    public static String merchantSerialNumber = "5157F09EFDC096DE15EBE81A47057A72********";
16    /** 商户APIV3密钥 */
17    public static String apiV3key = "...";
18    public static void main(String[] args) {
19        // 使用自动更新平台证书的RSA配置
20        // 建议将 config 作为单例或全局静态对象，避免重复的下载浪费系统资源
21        Config config =
22                new RSAAutoCertificateConfig.Builder()
23                        .merchantId(merchantId)
24                        .privateKeyFromPath(privateKeyPath)
25                        .merchantSerialNumber(merchantSerialNumber)
26                        .apiV3Key(apiV3key)
27                        .build();
28        // 构建service
29        NativePayService service = new NativePayService.Builder().config(config).build();
30        // request.setXxx(val)设置所需参数，具体参数可见Request定义
31        PrepayRequest request = new PrepayRequest();
32        Amount amount = new Amount();
33        amount.setTotal(100);
34        request.setAmount(amount);
35        request.setAppid("wxa9d9651ae******");
36        request.setMchid("190000****");
37        request.setDescription("测试商品标题");
38        request.setNotifyUrl("https://notify_url");
39        request.setOutTradeNo("out_trade_no_001");
40        // 调用下单方法，得到应答
41        PrepayResponse response = service.prepay(request);
42        // 使用微信扫描 code_url 对应的二维码，即可体验Native支付
43        System.out.println(response.getCodeUrl());
44    }
45}