Question

我正在使用Eclipse将json转换为Java中的字符串。但我一直得到：

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException

每次我尝试运行程序时都会出现

错误消息。 Eclipse 无法识别我的代码中的任何错误/错误。我做了一些研究，似乎我的json无效（我使用了JSONLint）。

这是我的json：

String json =     
 "{"
                +"'$type': 'Tfl.Api.Presentation.Entities.RoadCorridor, Tfl.Api.Presentation.Entities',"
                + "'id' : a1,"
                + "'displayName' : 'A1',"
                + "'statusSeverity' : 'Good',"
                + "'statusSeverityDescription' : 'No Exceptional Delays',"
                + "'bounds' : '[[-0.25616,51.5319],[-0.10234,51.6562]]',"
                + "'envelope' : '[[-0.25616,51.5319],[-0.25616,51.6562],[-0.10234,51.6562],[-0.10234,51.5319],[-0.25616,51.5319]]',"
                + "'url' : 'https://api-argon.tfl.gov.uk/Road/a1'"
                + "}";

请有人告诉我json有什么问题以及如何更改它以使其有效？我对java和json很新，很抱歉，如果我错过了我应该包含的任何细节。

Answer 1

您使用单引号作为json标识符。使用双引号。

"\"$type\": \"Tfl.Api.Presentation.Entities.RoadCorridor, Tfl.Api.Presentation.Entities\"," + etc.

该错误是因为您的json代码格式错误，这些单引号虽然在Java中很方便，但对json无效。

Answer 2

你会使用单引号而不是双引号来解决问题

 {
    "$type": "Tfl.Api.Presentation.Entities.RoadCorridor, Tfl.Api.Presentation.Entities",
    "id": "a1",
    "displayName": "A1",
    "statusSeverity": "Good",
    "statusSeverityDescription": "No Exceptional Delays",
    "bounds": "[[-0.25616,51.5319],[-0.10234,51.6562]]",
    "envelope": "[[-0.25616,51.5319],[-0.25616,51.6562],[-0.10234,51.6562],[-0.10234,51.5319],[-0.25616,51.5319]]",
    "url": "https://api-argon.tfl.gov.uk/Road/a1"
 }

这里你的json现在有效，作为参考，我发现jsonlint.com非常适合帮助调试无效的json

Answer 3

您可能希望使用下面的更改。处理数组时存在问题。

{
'$type': {
    'Tfl.Api.Presentation.Entities.RoadCorridor, Tfl.Api.Presentation.Entities'
},
'id': a1,
'displayName': 'A1',
'statusSeverity': 'Good',
'statusSeverityDescription': 'No Exceptional Delays',
'bounds': '[[-0.25616,51.5319],[-0.10234,51.6562]]',
'envelope': '[[-0.25616,51.5319],[-0.25616,51.6562],[-0.10234,51.6562],[-0.10234,51.5319],[-0.25616,51.5319]]',
'url': 'https://api-argon.tfl.gov.uk/Road/a1'

}

请参阅此处 - http://www.w3schools.com/js/js_json_intro.asp

java.lang.IllegalStateException错误消息

3 个答案: