Json 如何从响应体获取令牌值？

我试图从response.body获取令牌值，并将其存储在共享首选项中

以下是我得到的JSON响应：

{"meta":{"error":false,"message":"","statusCode":200},"response":{"token":"JhbGciOiJIUzI1NiJ9.MiOiJodHRwczovL3N0Z62Q_NQJcK0dFCKiUOsl-k","user":{"id":12,"name":"suuu","firstName":"sss","lastName":"ss","icNumber":null,"email":"wew@example.com","description":"Retails Test","gender":"Male","phoneNumber":"0123456789","website":"retailsexample.com","createdAt":"2017-09-15 11:27:42","updatedAt":"2019-08-21 16:08:32","oldEmailData":null,"profilePictures":[{"width":795,"height":800

我试图像这样打印令牌，但它显示空结果：

  print('access token is -> ${json.decode(response.body)[ 'token']}');

所以我有这个代码来获取和存储令牌：

  if(request.statusCode == 200) {
  jsonResponse = json.decode(response.body);
  if(jsonResponse != null) {
    setState(() {
      _isLoading = false;
    });
    sharedPreferences.setString("token", jsonResponse['token']);
    Navigator.of(context).pushAndRemoveUntil(MaterialPageRoute(builder: (BuildContext context) => MainPage()), (Route<dynamic> route) => false);
  }

if（request.statusCode==200）{
jsonResponse=json.decode（response.body）；
if（jsonResponse！=null）{
设置状态（）{
_isLoading=false；
});
setString（“token”，jsonResponse['token']）；
Navigator.of（context）.pushandremoveintil（MaterialPageRoute（builder:（BuildContext context）=>MainPage（），（Route-Route）=>false）；
}

---

那么，如何从response.body获取令牌呢？

下面的一行将令牌放入字符串变量中：

String token = jsonResponse['response']['token']

在代码中，只需替换

sharedPreferences.setString("token", jsonResponse['token'])

与

sharedPreferences.setString("token", jsonResponse['response']['token'])