Flutter-删除飞镖中的转义序列 [英] Flutter - Remove escape sequence in dart

问题描述

要将API响应字符串解码为JSON，json.decode()可以正常工作.
这将解析类似于

To decode API response string to JSON, json.decode() works fine.
This will parse a JSON string similar to

{ "Response" : {"Responsecode" : "1" , "Response" : "Success"}}

但是在我的情况下，响应以序列化形式出现，例如:

But in my case, the response comes in the serialized form like:

{\"Response\" : {\"Responsecode\" : \"0\" , \"Response\" : \"Success\"}}

json.decode()无法正常工作.

在Java中，我将StringEscapeUtils.unescapeJson()用于相同的问题.
我搜索了Dart，但找不到如何对字符串中的字符进行转义.

In Java, I used StringEscapeUtils.unescapeJson() for the same problem.
I searched for Dart but couldn’t find how to unescape characters in a string.

修改:
假设键数据的值为abc"de
因此，其对应的JSON为{"data":"abc\"de"}
因此，在序列化期间，此json字符串将转义以给出{\"data\":\"abc\\\"de\"}作为响应，该响应由API发送.
因此，我的意图是删除转义序列，以便获得字符串{"data":"abc\"de"}，稍后将使用json.decode()对其进行解码.删除转义序列是使用Java中的StringEscapeUtils.unescapeJson()完成的.

Suppose, the value of key data is abc"de
So, its corresponding JSON would be {"data":"abc\"de"}
And hence during serialization, this json string is escaped to give {\"data\":\"abc\\\"de\"} as the response, which is sent by the API.
So, my intention is to remove the escape sequences, so that I can get the string {"data":"abc\"de"}, which would later be decoded using json.decode(). Removing the escape sequences was done using StringEscapeUtils.unescapeJson() in java.

推荐答案

json.decode也可以解码单个字符串，因此您应该可以调用它两次.第一次它将返回一个字符串(转义字符已在其中解码)，第二次它将返回该字符串到映射中:

json.decode can decode single strings too, so you should be able to just call it twice. The first time it'll return you a string (where the escape characters have been decoded) and the second time it'll decode that string into the map:

import 'dart:convert';

void main() {
  var a = r'''"{\"Response\" : {\"Responsecode\" : \"0\" , \"Response\" : \"Success\"}}"''';
  var b = json.decode(json.decode(a));
  print(b['Response']['Responsecode']); // 0
  print(b['Response']['Response']); // Success
}

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