需要从此 json 文件中访问所有元素 [重复]

Question

我有一个文件，json 文件，我想访问其中的所有元素。我该怎么做。 文件结构是这样的

  {
  "Sessions": [
    {
      "AppVersion": "2.4.0", 
      "Connectivity": "Cellular", 
      "Device": "iPhone 6 Plus", 
      "DeviceType": "Phone", 
      "Duration": 958616, 
      "Id": "591e3580e3f5fb2ade29f4d8", 
      "Location": {
        "Country": "US", 
        "Description": "Cleveland Texas"
      }, 
      "OSVersion": "10.3.1", 
      "Platform": "iOS", 
      "Screens": [
        {
          "Actions": [], 
          "Gestures": [], 
          "Name": "LoginPage", 
          "StartTime": 0
        }, 
        {
          "Actions": [
            {
              "Description": "Image", 
              "Index": "2.23", 
              "Time": 46179, 
              "Type": "ButtonTap"
            }, 
            {
              "Description": "Image", 
              "Index": "2.23", 
              "Time": 46735, 
              "Type": "ButtonTap"
            }, ]}

......100 个元素

我只能访问Sessions，不能访问里面，比如我想访问“Time”，怎么做？

Answer 1

试试 jsonlite 包

https://cran.r-project.org/web/packages/jsonlite/vignettes/json-aaquickstart.html

  library(jsonlite)
  myfile <- fromJSON("mydata.json", flatten=TRUE)

另见Importing data from a JSON file into R