杰克逊解析包含对象数组和带动态键的地图数组的JSON

I have json like this:

我有这样的json：

{

    "users":{
           "1234":{
                 "firstname":"Joe",
                 "lastname":"Smith"
           },
           "9876":{
                 "firstname":"Bob",
                 "lastname":"Anderson"
           }
    },
    "jobs":[
          {
              "id":"abc",
              "location":"store"
          },
          {
              "id":"def",
              "location":"factory"
          }
    ]
}
{

    "u