<!-- pom.xml -->
<dependencies>
    <!-- Spring Boot Web -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <!-- MyBatis & MySQL -->
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>2.2.2</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    
    <!-- 微信支付SDK -->
    <dependency>
        <groupId>com.github.wechatpay-apiv3</groupId>
        <artifactId>wechatpay-apache-httpclient</artifactId>
        <version>0.4.7</version>
    </dependency>
    
    <!-- XML處理 -->
    <dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-xml</artifactId>
    </dependency>
    
    <!-- Lombok -->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
</dependencies>

@Configuration
public class WxPayConfig {

    @Value("${wxpay.app_id}")
    private String appId;
    
    @Value("${wxpay.mch_id}")
    private String mchId;
    
    @Value("${wxpay.mch_key}")
    private String mchKey;
    
    @Value("${wxpay.notify_url}")
    private String notifyUrl;
    
    @Value("${wxpay.cert_path}")
    private String certPath; // 證書路徑（apiclient_cert.p12）
    
    @Value("${wxpay.api_v3_key}")
    private String apiV3Key;

    // 微信支付HttpClient
    @Bean
    public CloseableHttpClient wxPayHttpClient() throws Exception {
        // 加載商戶私鑰
        PrivateKey merchantPrivateKey = getPrivateKey();
        
        // 使用自動更新平臺證書的驗證器
        AutoUpdateCertificatesVerifier verifier = new AutoUpdateCertificatesVerifier(
                new WechatPay2Credentials(mchId, new PrivateKeySigner(mchSerialNo, merchantPrivateKey)),
                apiV3Key.getBytes(StandardCharsets.UTF_8));
        
        // 初始化httpClient
        return WechatPayHttpClientBuilder.create()
                .withMerchant(mchId, mchSerialNo, merchantPrivateKey)
                .withValidator(new WechatPay2Validator(verifier))
                .build();
    }

    // 獲取商戶私鑰
    private PrivateKey getPrivateKey() throws Exception {
        InputStream inputStream = new ClassPathResource(certPath).getInputStream();
        KeyStore keyStore = KeyStore.getInstance("PKCS12");
        keyStore.load(inputStream, mchId.toCharArray());
        return (PrivateKey) keyStore.getKey(mchId, mchId.toCharArray());
    }

    // 微信支付服務
    @Bean
    public WxPayService wxPayService(CloseableHttpClient wxPayHttpClient) {
        WxPayConfig payConfig = new WxPayConfig();
        payConfig.setAppId(appId);
        payConfig.setMchId(mchId);
        payConfig.setKey(mchKey);
        payConfig.setNotifyUrl(notifyUrl);
        payConfig.setApiV3Key(apiV3Key);
        return new WxPayServiceImpl(payConfig, wxPayHttpClient);
    }
}

// 訂單實體
@Data
public class Order {
    private Long id;
    private String orderNo;   // 商戶訂單號
    private BigDecimal amount;// 支付金額
    private Integer status;   // 0-待支付, 1-已支付
    private LocalDateTime createTime;
    private String openid;    // 微信用戶openid
}

// MyBatis Mapper
@Mapper
public interface OrderMapper {
    @Insert("INSERT INTO orders(order_no, amount, status, create_time, openid) " +
            "VALUES(#{orderNo}, #{amount}, 0, NOW(), #{openid})")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    void insert(Order order);
    
    @Update("UPDATE orders SET status = #{status} WHERE order_no = #{orderNo}")
    void updateStatus(@Param("orderNo") String orderNo, @Param("status") int status);
    
    @Select("SELECT * FROM orders WHERE order_no = #{orderNo}")
    Order findByOrderNo(String orderNo);
}

@Service
public class WxPayService {

    @Autowired private WxPayService wxPayService;
    @Autowired private OrderMapper orderMapper;

    // 創(chuàng)建支付訂單
    public Map<String, String> createPayOrder(Order order) throws Exception {
        orderMapper.insert(order); // 保存訂單到數(shù)據(jù)庫

        // 構(gòu)建統(tǒng)一下單請求
        WxPayUnifiedOrderRequest request = new WxPayUnifiedOrderRequest();
        request.setBody("商品支付");
        request.setOutTradeNo(order.getOrderNo());
        request.setTotalFee(order.getAmount().multiply(new BigDecimal(100)).intValue()); // 微信支付單位為分
        request.setSpbillCreateIp("用戶IP"); // 實際獲取用戶IP
        request.setNotifyUrl(wxPayConfig.getNotifyUrl());
        request.setTradeType("JSAPI");
        request.setOpenid(order.getOpenid());

        // 調(diào)用統(tǒng)一下單API
        WxPayUnifiedOrderResult result = wxPayService.unifiedOrder(request);
        
        // 生成JSAPI調(diào)起支付參數(shù)
        Map<String, String> payParams = new HashMap<>();
        payParams.put("appId", appId);
        payParams.put("timeStamp", String.valueOf(System.currentTimeMillis() / 1000));
        payParams.put("nonceStr", WxPayUtil.generateNonceStr());
        payParams.put("package", "prepay_id=" + result.getPrepayId());
        payParams.put("signType", "RSA");
        
        // 生成簽名
        String sign = WxPayUtil.generateSignature(payParams, mchKey);
        payParams.put("paySign", sign);
        
        return payParams;
    }

    // 處理支付結(jié)果通知
    public String handleNotify(HttpServletRequest request) {
        try {
            // 解析通知內(nèi)容
            String xmlResult = IOUtils.toString(request.getInputStream(), request.getCharacterEncoding());
            WxPayOrderNotifyResult notifyResult = wxPayService.parseOrderNotifyResult(xmlResult);

            // 驗證簽名和業(yè)務結(jié)果
            if ("SUCCESS".equals(notifyResult.getResultCode())) {
                // 更新訂單狀態(tài)
                String orderNo = notifyResult.getOutTradeNo();
                orderMapper.updateStatus(orderNo, 1); // 更新為已支付
                
                // 返回成功響應
                return "<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>";
            }
        } catch (Exception e) {
            // 記錄日志
        }
        return "<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[處理失敗]]></return_msg></xml>";
    }
}

@RestController
@RequestMapping("/wxpay")
public class WxPayController {

    @Autowired private WxPayService wxPayService;

    // 創(chuàng)建支付訂單（返回調(diào)起支付所需參數(shù)）
    @PostMapping("/create")
    public Map<String, String> createOrder(@RequestParam BigDecimal amount, 
                                          @RequestParam String openid) throws Exception {
        Order order = new Order();
        order.setOrderNo(UUID.randomUUID().toString().replace("-", ""));
        order.setAmount(amount);
        order.setOpenid(openid);
        return wxPayService.createPayOrder(order);
    }

    // 微信支付結(jié)果通知（需要公網(wǎng)可訪問）
    @PostMapping(value = "/notify", produces = "application/xml; charset=UTF-8")
    public String wxpayNotify(HttpServletRequest request) {
        return wxPayService.handleNotify(request);
    }
    
    // 查詢訂單狀態(tài)
    @GetMapping("/status")
    public String getOrderStatus(@RequestParam String orderNo) {
        Order order = orderMapper.findByOrderNo(orderNo);
        if (order == null) {
            return "訂單不存在";
        }
        return order.getStatus() == 1 ? "已支付" : "未支付";
    }
}

<template>
  <div>
    <button @click="createOrder">微信支付</button>
  </div>
</template>

<script>
import axios from 'axios';

export default {
  methods: {
    async createOrder() {
      try {
        // 1. 獲取用戶openid（實際項目中需要通過OAuth2授權(quán)獲?。?
        const openid = '用戶openid';
        
        // 2. 創(chuàng)建訂單
        const response = await axios.post('/wxpay/create', {
          amount: 100, // 支付金額（元）
          openid: openid
        });
        
        // 3. 調(diào)起微信支付
        const payParams = response.data;
        wx.chooseWXPay({
          ...payParams,
          success: (res) => {
            console.log('支付成功', res);
            // 可跳轉(zhuǎn)到支付成功頁面
          },
          fail: (err) => {
            console.error('支付失敗', err);
          }
        });
      } catch (error) {
        console.error('創(chuàng)建訂單失敗', error);
      }
    }
  }
}
</script>

# application.properties
# 微信支付配置
wxpay.app_id=wx1234567890abcdef
wxpay.mch_id=1234567890
wxpay.mch_key=your_mch_key
wxpay.api_v3_key=your_api_v3_key
wxpay.notify_url=http://your-domain.com/wxpay/notify
wxpay.cert_path=classpath:cert/apiclient_cert.p12

# MySQL配置
spring.datasource.url=jdbc:mysql://localhost:3306/wxpay_demo
spring.datasource.username=root
spring.datasource.password=123456