Question

我如何在Throwable Scala对象中获取信息？

该代码是有关throwable.getMessage的示例。

JsResultException(errors:List((,List(JsonValidationError(List('eoh' is undefined on object: {"store":"8767565","sku":"1983278364782364782"}),WrappedArray())))))

我需要提取JsResultException，JsonValidationError作为字符串，消息'eoh' is undefined on object消息和JSON，然后提取object:。

这是用来制作优美的日志吗？

Answer 1

考虑将JsResultException.errors转换为

Seq[(JsPath, Seq[JsonValidationError])]

其中JsonValidationError.errors是另一个序列Seq[String]，进入一个更简单的元组

Seq[(JsPath, String)]

像这样

case JsResultException(errors) =>
  errors.map { case (path, validationErrors) => path -> validationErrors.map(_.messages.mkString(",")).mkString(",") }

这将产生更易于管理的结构，类似于

List((/id,error.path.missing), (/name,error.path.missing))

代替

List((/id,List(JsonValidationError(List(error.path.missing),WrappedArray()))), (/name,List(JsonValidationError(List(error.path.missing),WrappedArray())))))]

这是一个可行的例子

case class User(name: String, id: Int)
object User {
  implicit val formats = Json.format[User]
}

val raw = """{ "nam": "mario", "i": 5 }"""

try {
  Json.parse(raw).as[User]
} catch {
  case JsResultException(errors) =>
    errors.map { case (path, validationErrors) => path -> validationErrors.map(_.messages.mkString(",")).mkString(",") }
}

也考虑使用using validation以避免抛出类似的异常

Json.parse(raw).validate[User] match {
  case s: JsSuccess[User] => s
  case JsError(errors) => 
    errors.map { case (path, validationErrors) => path -> validationErrors.map(_.messages.mkString(",")).mkString(",") }
}

Answer 2

您始终可以使用scala.util.Try和Pattern匹配Failure。

import scala.util._

def someExceptionThrowingMethod(): T = ???

Try(someExceptionThrowingMethod()) match {
    case Success(t: T) => ???
    case Failure(exception: Throwable) => exception match {
        case JsResultException((_, JsonValidationError(headMessage :: _) :: _, _) :: _) => 
          //here headMessage is the 'eoh' is undefined on object: {"store":"8767565","sku":"1983278364782364782"} message you wrote above
        case otherException: Throwable => ???
    }
}

如何在Throwable Scala对象中获取数据？

2 个答案: