新增卡券的客服消息类型

1. WxCardBuilder用于构建卡券的客服消息；
2. WxMpCustomMessage新作cardId字段及卡券builder；
3. CustomMessageGsonAdapter处理cardId序列化名字；
4. WxConsts新作WXCARD卡券类型。

weixin-java-common/src/main/java/me/chanjar/weixin/common/api/WxConsts.java

@@ -30,6 +30,7 @@ public class WxConsts {
   public static final String CUSTOM_MSG_MUSIC = "music";
   public static final String CUSTOM_MSG_NEWS = "news";
   public static final String CUSTOM_MSG_FILE = "file";
+  public static final String CUSTOM_MSG_WXCARD = "wxcard";
   public static final String CUSTOM_MSG_TRANSFER_CUSTOMER_SERVICE = "transfer_customer_service";
   public static final String CUSTOM_MSG_SAFE_NO = "0";
   public static final String CUSTOM_MSG_SAFE_YES = "1";

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/bean/WxMpCustomMessage.java

@@ -25,6 +25,7 @@ public class WxMpCustomMessage implements Serializable {
   private String musicUrl;
   private String hqMusicUrl;
   private String kfAccount;
+  private String cardId;
   private List<WxArticle> articles = new ArrayList<>();
 
   public String getToUser() {
@@ -46,6 +47,7 @@ public class WxMpCustomMessage implements Serializable {
    * {@link me.chanjar.weixin.common.api.WxConsts#CUSTOM_MSG_MUSIC}
    * {@link me.chanjar.weixin.common.api.WxConsts#CUSTOM_MSG_VIDEO}
    * {@link me.chanjar.weixin.common.api.WxConsts#CUSTOM_MSG_NEWS}
+   * {@link me.chanjar.weixin.common.api.WxConsts#CUSTOM_MSG_WXCARD}
    * </pre>
    * @param msgType
    */
@@ -94,6 +96,15 @@ public class WxMpCustomMessage implements Serializable {
   public void setHqMusicUrl(String hqMusicUrl) {
     this.hqMusicUrl = hqMusicUrl;
   }
+
+  public String getCardId() {
+    return cardId;
+  }
+
+  public void setCardId(String cardId) {
+    this.cardId = cardId;
+  }
+
   public List<WxArticle> getArticles() {
     return this.articles;
   }
@@ -181,6 +192,15 @@ public class WxMpCustomMessage implements Serializable {
     return new NewsBuilder();
   }
 
+
+  /**
+   * 获得卡券消息builder
+   * @return
+   */
+  public static WxCardBuilder WXCARD() {
+    return new WxCardBuilder();
+  }
+
   public String getKfAccount() {
     return this.kfAccount;
   }
@@ -188,5 +208,4 @@ public class WxMpCustomMessage implements Serializable {
   public void setKfAccount(String kfAccount) {
     this.kfAccount = kfAccount;
   }
-  
 }

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/bean/custombuilder/WxCardBuilder.java

@@ -0,0 +1,31 @@
+package me.chanjar.weixin.mp.bean.custombuilder;
+
+import me.chanjar.weixin.common.api.WxConsts;
+import me.chanjar.weixin.mp.bean.WxMpCustomMessage;
+
+/**
+ * 卡券消息builder
+ * <pre>
+ * 用法: WxMpCustomMessage m = WxMpCustomMessage.WXCARD().cardId(...).toUser(...).build();
+ * </pre>
+ * @author mgcnrx11
+ *
+ */
+public final class WxCardBuilder extends BaseBuilder<WxCardBuilder> {
+  private String cardId;
+
+  public WxCardBuilder() {
+    this.msgType = WxConsts.CUSTOM_MSG_WXCARD;
+  }
+
+  public WxCardBuilder cardId(String cardId) {
+    this.cardId = cardId;
+    return this;
+  }
+
+  public WxMpCustomMessage build() {
+    WxMpCustomMessage m = super.build();
+    m.setCardId(this.cardId);
+    return m;
+  }
+}

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/util/json/WxMpCustomMessageGsonAdapter.java

@@ -76,6 +76,12 @@ public class WxMpCustomMessageGsonAdapter implements JsonSerializer<WxMpCustomMe
       messageJson.add("news", newsJsonObject);
     }
 
+    if (WxConsts.CUSTOM_MSG_WXCARD.equals(message.getMsgType())) {
+      JsonObject wxcard = new JsonObject();
+      wxcard.addProperty("card_id", message.getCardId());
+      messageJson.add("wxcard", wxcard);
+    }
+    
     if (StringUtils.isNotBlank(message.getKfAccount())){
       JsonObject newsJsonObject = new JsonObject();
       newsJsonObject.addProperty("kf_account", message.getKfAccount());