初步添加微信支付配置类

src/main/java/com/greenorange/promotion/config/WxPayConfig.java

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+package com.greenorange.promotion.config;
+
+import com.wechat.pay.java.core.RSAAutoCertificateConfig;
+import com.wechat.pay.java.core.util.IOUtil;
+import com.wechat.pay.java.service.payments.jsapi.JsapiServiceExtension;
+import com.wechat.pay.java.service.refund.RefundService;
+import lombok.Data;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+
+@Data
+@Slf4j
+@Configuration
+@Component("WxPayConfig")
+@ConfigurationProperties(prefix = "wx.pay")
+public class WxPayConfig {
+
+    private String appId;
+
+    private String apiV3Key;
+
+    private String notifyUrl;
+
+    private String merchantId;
+
+    private String privateKeyPath;
+
+    private String merchantSerialNumber;
+
+    // RSA配置
+    private RSAAutoCertificateConfig RSAConfig;
+
+    // JSAPI支付
+    private JsapiServiceExtension jsapiServiceExtension;
+
+    // 退款
+    private RefundService refundService;
+
+    /**
+     * 初始化配置
+     */
+    @Bean
+    public boolean initWxPayConfig() throws IOException {
+        this.RSAConfig = buildRSAAutoCertificateConfig();
+        this.jsapiServiceExtension = buildJsapiServiceExtension(RSAConfig);
+        this.refundService = buildRefundService(RSAConfig);
+        return true;
+    }
+
+    // 构建并使用自动更新平台证书的RSA配置，一个商户号只能初始化一个配置，否则会因为重复的下载任务报错
+    private RSAAutoCertificateConfig buildRSAAutoCertificateConfig() throws IOException {
+        // 将 resource 目录下的文件转为 InputStream，然后利用 IOUtil.toString(inputStream) 转化为密钥
+        String privateKey = IOUtil.toString(new ClassPathResource(privateKeyPath).getInputStream());
+        return new RSAAutoCertificateConfig.Builder()
+                .merchantId(merchantId)
+                .privateKey(privateKey)
+                .merchantSerialNumber(merchantSerialNumber)
+                .apiV3Key(apiV3Key)
+                .build();
+    }
+
+    // 构建JSAPI支付
+    private JsapiServiceExtension buildJsapiServiceExtension(RSAAutoCertificateConfig config) {
+        return new JsapiServiceExtension.Builder().config(config).build();
+    }
+
+    // 构建退款
+    private RefundService buildRefundService(RSAAutoCertificateConfig config) {
+        return new RefundService.Builder().config(config).build();
+    }
+
+}