🆕 #1639 微信支付增加v3图片上传接口

1. 实现v3上传图片功能
文档地址： https://pay.weixin.qq.com/wiki/doc/apiv3/wxpay/tool/chapter3_1.shtml
2. 将接口获取到的证书保存到PayConfig中，v3接口中部分字段是敏感数据，在对这些数据加密时会用到

weixin-java-pay/src/test/java/com/github/binarywang/wxpay/service/impl/MerchantMediaServiceImplTest.java

@@ -0,0 +1,54 @@
+package com.github.binarywang.wxpay.service.impl;
+
+import com.github.binarywang.wxpay.bean.media.ImageUploadResult;
+import com.github.binarywang.wxpay.exception.WxPayException;
+import com.github.binarywang.wxpay.service.MerchantMediaService;
+import com.github.binarywang.wxpay.service.WxPayService;
+import com.github.binarywang.wxpay.testbase.ApiTestModule;
+import com.google.inject.Inject;
+import lombok.extern.slf4j.Slf4j;
+import org.testng.annotations.Guice;
+import org.testng.annotations.Test;
+
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * <pre>
+ *  媒体文件上传测试类
+ * </pre>
+ *
+ * @author zhouyongshen
+ */
+@Slf4j
+@Test
+@Guice(modules = ApiTestModule.class)
+public class MerchantMediaServiceImplTest {
+
+  @Inject
+  private  WxPayService wxPayService;
+
+  @Test
+  public  void testImageUploadV3() throws WxPayException, IOException {
+
+    MerchantMediaService merchantMediaService=new MerchantMediaServiceImpl(wxPayService);
+
+      String filePath="你的图片文件的路径地址";
+//    String filePath="WxJava/images/banners/wiki.jpg";
+
+    File file=new File(filePath);
+
+    ImageUploadResult imageUploadResult = merchantMediaService.imageUploadV3(file);
+    String mediaId = imageUploadResult.getMediaId();
+
+    log.info("mediaId1：[{}]",mediaId);
+
+    File file2=new File(filePath);
+
+    ImageUploadResult imageUploadResult2 = merchantMediaService.imageUploadV3(file2);
+    String mediaId2 = imageUploadResult2.getMediaId();
+
+    log.info("mediaId2：[{}]",mediaId2);
+
+  }
+}

weixin-java-pay/src/test/resources/test-config.sample.xml

@@ -10,4 +10,12 @@
   -->
   <keyPath>商户平台的证书文件地址</keyPath>
   <openid>某个openId</openid>
+
+  <!--
+  apiv3 模式下所需配置
+  <privateKeyPath>apiclient_key.pem证书文件的绝对路径或者以classpath:开头的类路径.</privateKeyPath>
+  <privateCertPath>apiclient_cert.pem证书文件的绝对路径或者以classpath:开头的类路径.</privateCertPath>
+  <apiV3Key> apiV3 秘钥值.</apiV3Key>
+  <certSerialNo>apiV3 证书序列号值</certSerialNo>
+  -->
 </xml>