liftweb - 访问get/post参数

Question

如何在RestHelper中的lift框架中简单地访问get和post属性？文档中没有任何明确的例子:(

package my.domain

import net.liftweb.http._
import net.liftweb.http.rest._
import net.liftweb.json.JsonAST._
import net.liftweb.json._
import net.liftweb.common.{Box,Full,Empty,Failure,ParamFailure}
import net.liftweb.mapper._


import ru.dmteam.model.{RssItem}

object ContentRest extends RestHelper {


    def getq: String = {
        val q = S.param("q")
        q.toString
    }

    serve {
        case "api" :: "static" :: _ XmlGet _=> <b>{getq}</b>

    }
}

我想了解如何q在我请求时提升电梯的价值http://localhost:8080/api/static.xml?q=test

Answer 1

Lift使用Box而不是null来指示是否传递了参数.这样可以很好地利用Scala进行理解,将一个好的请求处理程序链接在一起.我会让代码说明一切:

object MyRest extends RestHelper {
  // serve the q parameter if it exists, otherwise
  // a 404
  serve {
    case "api" :: "x1" :: _ Get _ =>
      for {
        q <- S.param("q")
      } yield <x>{q}</x>
  }

  // serve the q parameter if it exists, otherwise
  // a 404 with an error string
  serve {
    case "api" :: "x2" :: _ Get _ =>
      for {
        q <- S.param("q") ?~ "Param 'q' missing"
      } yield <x>{q}</x>
  }

  // serve the q parameter if it exists, otherwise
  // a 401 with an error string
  serve {
    case "api" :: "x2" :: _ Get _ =>
      for {
        q <- S.param("q") ?~ "Param 'q' missing" ~> 401
      } yield <x>{q}</x>
  }

  // serve the q, r, s parameters if this exists, otherwise
  // different errors
  serve {
    case "api" :: "x3" :: _ Get _ =>
      for {
        q <- S.param("q") ?~ "Param 'q' missing" ~> 401
        r <- S.param("r") ?~ "No 'r'" ~> 502
        s <- S.param("s") ?~ "You're s-less" ~> 404
      } yield <x><q>{q}</q><r>{r}</r><s>{s}</s></x>
  }

}

Answer 2

我不确定,但你能试试吗？

S.param("param_name")

http://scala-tools.org/mvnsites-snapshots/liftweb/scaladocs/index.html

或者使用req类

case r @ JsonPost("some" :: "path" :: _, json) => _ => {
   r.param("name")
}

http://scala-tools.org/mvnsites-snapshots/liftweb/scaladocs/index.html

编辑:我有这个示例运行:

package code.rest

import net.liftweb.http.rest._

object SampleRest extends RestHelper {
  serve {
    case Get("sample" :: _, req) =>
        <hello>{req.param("name") getOrElse ("??") }</hello>
  }
}