正如我在標題中所寫，我正在嘗試從服務器獲取資料，但是 http.get(Uri.parse(url)) 方法回傳空正文，并且當然是由于嘗試解碼空正文而導致的錯誤，但是如果我在我看到 json 內容之前復制粘貼使用的 url。這怎么可能？
我正在使用的功能是：
Future getData ( ) async {
String url = 'http://www.viaggiatreno.it/viaggiatrenonew/resteasy/viaggiatreno/andamentoTreno/...';
http.Response response = await http.get(Uri.parse(url));
if (response.statusCode == 204) {
var data = response.body;
print("data are : $data");
return jsonDecode(data);
} else {
print("unable to load data");
}
}
這是我應該用這個命令看到的一小部分： print("data are : $data");
{
"tipoTreno":"PG",
"orientamento":"B",
"codiceCliente":1,
"fermateSoppresse":[
],
"dataPartenza":null,
"fermate":[
{
"orientamento":"B",
"kcNumTreno":null,
"stazione":"VENEZIA SANTA LUCIA",
"id":"S02593",
"listaCorrispondenze":null,
"programmata":1646663160000,
"programmataZero":null,
"effettiva":1646663160000,
"ritardo":0,
"partenzaTeoricaZero":1646663160000,
"arrivoTeoricoZero":null,
"partenza_teorica":1646663160000,
"arrivo_teorico":null,
"isNextChanged":false,
"partenzaReale":1646663160000,
"arrivoReale":null,
"ritardoPartenza":0,
"ritardoArrivo":0,
"\"pro ...........}"
所以你可以看到 body 是你想要的但不是空的，它是 json 格式。誰能幫我？我無法解決這個問題。
輸出是：
I/flutter (3177): data are:
E/flutter ( 3177): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: FormatException: Unexpected end of input (at character 1)
E/flutter ( 3177):
E/flutter ( 3177): ^
E/flutter ( 3177):
E/flutter ( 3177): #0 _ChunkedJsonParser.fail (dart:convert-patch/convert_patch.dart:1405:5)
E/flutter ( 3177): #1 _ChunkedJsonParser.close (dart:convert-patch/convert_patch.dart:523:7)
E/flutter ( 3177): #2 _parseJson (dart:convert-patch/convert_patch.dart:41:10)
E/flutter ( 3177): #3 JsonDecoder.convert (dart:convert/json.dart:612:36)
E/flutter ( 3177): #4 JsonCodec.decode (dart:convert/json.dart:216:41)
E/flutter ( 3177): #5 jsonDecode (dart:convert/json.dart:155:10)
E/flutter ( 3177): #6 NetworkHelper.ottieniTutteInfo (package:agenda_ferrovia/utilities/networkConnection.dart:36:14)
E/flutter ( 3177): <asynchronous suspension>
E/flutter ( 3177): #7 _ServizioUIAggiungiTrenoState.build.ottieniOrigine (package:agenda_ferrovia/screens/servizioUI/servizioUI_singolo.dart:110:33)
E/flutter ( 3177): <asynchronous suspension>
E/flutter ( 3177): #8 _ServizioUIAggiungiTrenoState.build.<anonymous closure> (package:agenda_ferrovia/screens/servizioUI/servizioUI_singolo.dart:231:23)
E/flutter ( 3177): <asynchronous suspension>
E/flutter ( 3177):
uj5u.com熱心網友回復：
感謝大家的支持！我找到了問題！'url's String' 的某些部分來自另一個呼叫。在變數內部有“隱藏字符”\n。這就是問題的原因-.-我已經解決了在保存到用于“url”的變數之前洗掉除字母之外的所有字符的問題。我希望我的英語足夠清晰，可以理解。
再見！
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