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1，json是一种轻量级的数据交换格式。而它的轻量级指的是和xml做比较，数据交换指定是客户端和服务器之间业务数据的传递格式。json是由键值对组成，并且由花括号包围，每个键由引号引起来，键和值之间用冒号进行分隔，多键值对之间由逗号进行分隔。//map和j
private static List<Menu> treeList = new ArrayList<>(); //全局变量
"}\n";List value = (List) map.get(key);System.out.println("key:" + key);Gson gson = new Gson();LoggerSwitch
--gson工具，封装http用-->
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