JSONObject 转换为Map

JSONObject obj = new JSONObject();
{
obj.put("key1", "value1");
obj.put("key2", "value2");
obj.put("key3", "value3");
}
Map params = JSONObject.parseObject(obj.toJSONString(), new TypeReference>(){});
System.out.println(params);

输出：{key3=value3, key2=value2, key1=value1}