Post数组使用http flutter

Question

这是我运行代码时得到的错误。

E/flutter (21412): 
#0      CastMap.forEach.<anonymous closure> (dart:_internal/cast.dart:288:25) E/flutter (21412): 
#1     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:397:8) E/flutter (21412): 
#2 CastMap.forEach (dart:_internal/cast.dart:287:13) E/flutter (21412):
#3      mapToQuery (package:http/src/utils.dart:17:7) E/flutter (21412): 
#4      Request.bodyFields=(package:http/src/request.dart:137:12) /flutter (21412): 
#5     BaseClient._sendUnstreamed package:http/src/base_client.dart:85:17) E/flutter (21412): 
#6      BaseClient.post (package:http/src/base_client.dart:32:7) E/flutter (21412): 
#7     post.<anonymous closure> (package:http/http.dart:70:16) E/flutter (21412): 
#8      _withClient (package:http/http.dart:166:20) E/flutter (21412): 
#9      post (package:http/http.dart:69:5) E/flutter (21412):
#10     _preferenceState.add_preference (package:hulue/ui/cv_from/components/preference.dart:441:26)

下面是我使用的抛出错误的代码:

List commentList = ['1','2','3'];
post_preference() async {
print(commentList);
var response = await http.post(
"$uri/subscriber/add_preference",
body: {'category':commentList},
headers: <String, String>{
//'Content-type': 'application/json',
'Accept': 'application/json',
"Authorization": "Bearer $token"
},
); 
print(response.statusCode);
// print(response.body);
var jsonResponse = await convert.jsonDecode(response.body);
print(json.decode(jsonResponse));
if (response.statusCode != 200) {
print(response.statusCode);
// print(jsonResponse);
// print(response);
Fluttertoast.showToast(
msg: "successful add ",
toastLength: Toast.LENGTH_SHORT,
backgroundColor: Colors.green,
gravity: ToastGravity.CENTER,
);
Navigator.pushReplacement(
this.context,
MaterialPageRoute(builder: (context) => myCv()),
);
}
}

Answer 1

try this:

body: json.encode(body: {'category':commentList}),