Question

下面的代码片段在Flutter json解码中引发Format Exception，请问有什么建议吗？

import 'dart:async' show Future;
import 'dart:convert';

Future<String> readBooks() async {
  String jsonString = '{"description":"As part of the "You Don’t Know JS" series","quantity":55}';

  Map<String, dynamic> books = json.decode(jsonString);
  return jsonString;
}

格式异常：

2018-10-23 20：40：30.680 18115-18142 / addon.com.bookshop E / flutter： [错误：flutter / shell / common / shell.cc（181）] Dart错误：未处理例外： FormatException：意外字符（在字符26处） {“名称”：“作为“您不知道JS”系列的一部分”，“年龄”：55} ^

#0      _ChunkedJsonParser.fail (dart:convert/runtime/libconvert_patch.dart:1358:5)
#1      _ChunkedJsonParser.parse (dart:convert/runtime/libconvert_patch.dart:919:48)
#2      _parseJson (dart:convert/runtime/libconvert_patch.dart:29:10)
#3      JsonDecoder.convert (dart:convert/json.dart:540:36)
#4      JsonCodec.decode (dart:convert/json.dart:167:41)
#5      _MyHomePageState.readBooks (file:///E:/Me/TimePass/flutter/book_shop/lib/main.dart:58:39)
<asynchronous suspension>
#6      _MyHomePageState.build.<anonymous closure> (file:///E:/Me/TimePass/flutter/book_shop/lib/main.dart:48:39)
<asynchronous suspension>
#7      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:503:14)
#8      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:558:30)
#9      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
#10     TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
#11     TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:175:7)
#12     PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
#13     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
#14     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
#15     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:143:19)
#16     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
#17     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
#18     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue

（package：flutter / src / gestures / binding.dart：64：7）＃19 _WidgetsFlutterBinding＆BindingBase＆GestureBinding._handlePointerDataPacket （包：flutter / src / gestures / binding.dart：48：7）＃20 _invoke1（dart：ui / hooks.dart：142：13）＃21 _dispatchPointerDataPacket（dart：ui / hooks.dart：99：5）

Answer 1

那只是无效的JSON。
内部引号需要转为\"才能使JSON有效。

json.decode在json中的嵌套双引号上引发FormatException-dart

1 个答案: