包括如下接口：
- addNewsMedia - 新增圖文
- updateNewsInfo - 修改圖文

3.5.1 addNewsMedia 添加圖文

    WxNewsInfo news1 = new WxNewsInfo();
    news1.setTitle("標題1");
    news1.setThumb_media_id("圖片media_id");
    news1.setContent("xxx");
    //....設置圖文內(nèi)容
    WxNewsInfo news2 = new WxNewsInfo();
    news2.setTitle("標題1");
    news2.setThumb_media_id("圖片media_id");
    news2.setContent("xxx");
    List<WxNewsInfo> newsList = new ArrayList<>();
    newsList.add(news1);
    newsList.add(news2);
    try {
        String mediaId = iService.addNewsMedia(newsList);
    } catch (WxErrorException e) {
        e.printStackTrace();
    }

3.5.2 updateNewsInfo 修改圖文內(nèi)容

    WxNewsInfo news1 = new WxNewsInfo();
    news1.setTitle("標題1");
    news1.setThumb_media_id("圖片media_id");
    news1.setContent("xxx");
    try {
        //參數(shù)1：media_id；參數(shù)2：圖文位置下標。從0開始；參數(shù)3：新的圖文對象
        WxError result = iService.updateNewsInfo("media_id", 0, news1);
    } catch (WxErrorException e) {
        e.printStackTrace();
    }