IllegalStateException错误消息

Question

我正在使用Eclipse将json隐藏到Java中的字符串中。但我一直收到：

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

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'"
                + "}";

有人能告诉我json有什么问题吗？我如何改变它使其有效？我对java和json相当陌生，如果我错过了任何应该包括的细节，我很抱歉。

Answer 1

json标识符使用单引号。用双引号。

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

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。