如何创建一个在 Play 中打印整个请求和响应的方法？

Question

我想创建一个可以从 Controller 调用并打印 Request 的不同参数的辅助方法。我尝试执行如下操作，但我需要将类型参数传递给 Request。我应该为类型参数传递什么？

import play.api.mvc.Request

package object utilities {

  def printPlayHttpRequest (request:Request): Unit ={ //Request needs type parameter. What should I pass as type parameter?

  }
}

查看Request对象的apply方法，好像传递的type参数对应的是Body类型。那么我需要传递一些体型吗？

def apply[A](rh: RequestHeader, body: A): Request[A]

Answer 1

根据 Play 文档，我认为 Request[A] 中的 A 对应于主体类型，它可以是任何 Scala 类型作为请求主体，例如 String、NodeSeq、Array[Byte] 、JsonValue 或 java.io.File，只要我们有一个能够处理它的正文解析器

来自文档

Previously we said that an Action was a Request => Result function. This is not entirely true. Let’s have a more precise look at the Action trait:

trait Action[A] extends (Request[A] => Result) {
  def parser: BodyParser[A]
}

First we see that there is a generic type A, and then that an action must define a BodyParser[A]. With Request[A] being defined as:

trait Request[+A] extends RequestHeader {
  def body: A
}

The A type is the type of the request body. We can use any Scala type as the request body, for example String, NodeSeq, Array[Byte], JsonValue, or java.io.File, as long as we have a body parser able to process it.

To summarize, an Action[A] uses a BodyParser[A] to retrieve a value of type A from the HTTP request, and to build a Request[A] object that is passed to the action code.

以下是我的实现

import play.api.mvc.{AnyContent, Request}

package object utilities {

  def printPlayHttpRequest (request:Request[AnyContent]): Unit ={
    println(s"Attr: ${request.attrs}, \n Body: ${request.body},  \n connection: ${request.connection},  \n headers: ${request.headers},  \n method: ${request.method}, \n target:  ${request.target},  \n version: ${request.version},  \n mediatype: ${request.mediaType}")
  }
}

如何创建一个在 Play 中打印整个请求和响应的方法？

How to create a method which prints the entire Request and Response in Play?

playframework-2.6