JSONObiect requestParam = new JSONObject();
JSONArray item_list = new JSONArray();
JSONObject item = new JSONObject();
item.put("address", "/pages/index/index");
item.put("tag", "");
item.put("first class", "生活服务");
item.put("second _class" "休闲娱乐");
item.put("third class", "");
item.put("title", "");
item.put("first_id", 150);
item.put("second_id", 666);
item.put("third id", null);
item_list.add(item);
requestParam.put("item list", item_list);
requestParam.put("feedback_info", "");
requestParam.put("feedback_stuff", ""):
requestParam.put("version_desc", "");
requestParam.put("preview_info", new JSONObject()):
requestparam.put("ugc_declare", new JSONObject());
requestParam.put("privacy_api_not_use", "");
requestParam.put("order_path", "");

有些不能为空的项自己对文档，反正差不多这意思，楼上已经说得很明白了，你应该传子对象的对方不应该是Json字符串，而是json对象，实在不行你可以直接写成json字符串用JSONObject转成对象再扔给请求

itemlist就不对，文档是{} 不是 ”{}“