杰森出乎意料的角色 [英] Json unexpected character 

问题描述

我正在使用以下代码使用PowerShell重新生成Json，但是它会在json {标签开始之前创建意外的字符.

I am using below code to regenerate my Json using PowerShell, however it creates unexpected character before the start of the json { tag.

<#$data = Get-Content -Raw -Path myfile.json | ConvertFrom-Json#>

$data = @"
{
  "stations": [
    {
      "code": "1",
      "name": "United force"
    },
    {
      "code": "2",
      "name": "Toowoon Bay Service Station"
    }
],

 "prices": [
    {
      "stationcode": "1",
      "fueltype": "DL",
      "price": 126.97
    },
    {
      "stationcode": "1",
      "fueltype": "E10",
      "price": 118.92
    },
    {
      "stationcode": "2",
      "fueltype": "E10",
      "price": 112.90
    },
    {
      "stationcode": "2",
      "fueltype": "P95",
      "price": 125.90
    },
    {
      "stationcode": "2",
      "fueltype": "P98",
      "price": 155.90
    },
    {
      "stationcode": "2",
      "fueltype": "U91",
      "price": 115.20
    }
 ]
}
"@ | ConvertFrom-Json


foreach ($price in $data.prices) {
    $data.stations | 
    Where-Object { $_.code -eq $price.stationcode } |
    Add-Member -MemberType NoteProperty -Name $price.fueltype -Value $price.price
}

$data | Select-Object -Property stations | ConvertTo-Json | Set-Content "testJson.json" -Encoding UTF8

上传后调用此文件时，由于该意外字符，我无法读取json文件.

When calling this file after uploading, I am having trouble reading the json file due to that unexpected character.

希望有人可以在PowerShell代码中提供帮助，以确保没有这样的字符，我可能正在做一些简单的事情，但不确定如何做.

Hope someone can help in the PowerShell code to ensure there is no character like that, I may be doing something easy but not sure how.

我正在从PowerShell到Flutter之后读取生成的json文件，这将引发错误，如下所示

I am reading the generated json file after the PowerShell to Flutter, which throws the error as shown below

谢谢

推荐答案

您需要找到一种方法来让Flutter处理UTF-8字节顺序标记(0xEF 0xBB 0xBF)，或者将文件写为UTF8，而无需BOM

You need to find a way to have Flutter deal with the UTF-8 Byte Order Mark (0xEF 0xBB 0xBF), OR write the file as UTF8 without the BOM.

如果您使用的是PowerShell 6或更高版本，则可以使用

If you're using PowerShell 6 or up, you can use

Set-Content "testJson.json" -Encoding utf8NoBOM

对于低于版本6的PowerShell，它不可用，因此您可以使用

For PowerShell below version 6, that is not available, so you can use

$json = $data | Select-Object -Property stations | ConvertTo-Json

# [System.IO.File]::WriteAllText() defaults to UTF8 without BOM
# use an absolute path here
[System.IO.File]::WriteAllText("D:\Test\testJson.json", $json)

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