我正在从2.3升级playframework 2.4,我改变版本然后如果我编译相同的代码,我看到以下错误。由于我是Scala的新手,我正在尝试学习Scala来解决这个问题,但仍然不知道问题是什么。我想要做的是从原始请求标头添加请求标头值。任何帮助将不胜感激。
[error] /mnt/garner/project/app-service/app/com/company/playframework/filters/LoggingFilter.scala:26: not enough arguments for constructor Headers: (headers: Seq[(String, String)])play.api.mvc.Headers.
[error] Unspecified value parameter headers.
[error] val newHeaders = new Headers { val data = (requestHeader.headers.toMap
LoggingFilter类
class LoggingFilter extends Filter {
val logger = AccessLogger.getInstance();
def apply(next: (RequestHeader) => Future[Result])(requestHeader: RequestHeader): Future[Result] = {
val startTime = System.currentTimeMillis
val requestId = logger.createLog();
val newHeaders = new Headers { val data = (requestHeader.headers.toMap
+ (AccessLogger.X_HEADER__REQUEST_ID -> Seq(requestId))).toList }
val newRequestHeader = requestHeader.copy(headers = newHeaders)
next(newRequestHeader).map { result =>
val endTime = System.currentTimeMillis
val requestTime = endTime - startTime
val bytesToString: Enumeratee[ Array[Byte], String ] = Enumeratee.map[Array[Byte]]{ bytes => new String(bytes) }
val consume: Iteratee[String,String] = Iteratee.consume[String]()
val resultBody : Future[String] = result.body |>>> bytesToString &>> consume
resultBody.map {
body =>
logger.finish(requestId, result.header.status, requestTime, body)
}
result;
}
}
}
修改
我更新了以下代码,编译得很好
以下代码已更改
val newHeaders = new Headers { val data = (requestHeader.headers.toMap
+ (AccessLogger.X_HEADER__REQUEST_ID -> Seq(requestId))).toList }
到
val newHeaders = new Headers((requestHeader.headers.toSimpleMap
+ (AccessLogger.X_HEADER__REQUEST_ID -> requestId)).toList)
答案 0 :(得分:3)
它只是说明如果你想构建Headers
,你需要提供一个名为headers
的字段Seq[(String, String)]
。如果省略初始new
,您将使用相应apply
的{{1}}函数object
,它只会获取vararg(String,String)的参数你的代码应该有效。如果您查看文档https://www.playframework.com/documentation/2.4.x/api/scala/index.html#play.api.mvc.Headers并在对象和类的文档之间进行切换,那么它应该变得清晰。