微信后台------请求流程4-对象转换的设置【转换器】Transformer

绝地灬酷狼 2022-02-23 13:54 276阅读 0赞

1.创建【转换器】XStreamTransformer，实现:toXml + fromXml

2.静态代码块实现【转化器】注册

//向map中put    Map<Class<?>, XStream>
    
    static {
        registerClass(WxMpXmlMessage.class);//微信推送过来的消息，xml格式.
        registerClass(WxMpXmlOutMusicMessage.class);l
        registerClass(WxMpXmlOutNewsMessage.class);//被动回复的图文消息xml
        registerClass(WxMpXmlOutTextMessage.class);
        registerClass(WxMpXmlOutImageMessage.class);
        registerClass(WxMpXmlOutVideoMessage.class);
        registerClass(WxMpXmlOutVoiceMessage.class);
        registerClass(WxMpXmlOutTransferKefuMessage.class);
      }

/**
       * 会自动注册该类及其子类.
       *
       * @param clz 要注册的类
       */
      private static void registerClass(Class<?> clz) {
        XStream xstream = XStreamInitializer.getInstance();
    
        xstream.processAnnotations(clz);
        xstream.processAnnotations(getInnerClasses(clz));
        if (clz.equals(WxMpXmlMessage.class)) {
          // 模板消息推送成功的消息是MsgID，其他消息推送过来是MsgId
          xstream.aliasField("MsgID", WxMpXmlMessage.class, "msgId");
        }
    
        register(clz, xstream);
      }

3.使用

/**
       * pojo -> xml.
       */
      public static <T> String toXml(Class<T> clazz, T object) {
        return CLASS_2_XSTREAM_INSTANCE.get(clazz).toXML(object);
      }

/**
       * xml -> pojo.
       */ 
    public static <T> T fromXml(Class<T> clazz, InputStream is) {
        T object = (T) CLASS_2_XSTREAM_INSTANCE.get(clazz).fromXML(is);
        return object;
      }

/**
       * xml -> pojo.
       */  
      public static <T> T fromXml(Class<T> clazz, String xml) {
        T object = (T) CLASS_2_XSTREAM_INSTANCE.get(clazz).fromXML(xml);
        return object;
      }