您使用的是Lift 1.0 JsCmd
,它会生成带有单引号字符串的JSON,并尝试使用仅支持双引号字符串的scala解析器进行解析。
重要的是要意识到JSON有多个定义。
单引号字符串在JSON中有效吗?
Lift和Scala提供了多种解析JSON的方法,有时版本之间的行为不同。
这些解析器接受的字符串不相等。
base/lift-json/)库DSL 生产JSON
例:
scala> import net.liftweb.json.JsonAST
import net.liftweb.json.JsonAST
scala> import net.liftweb.json.JsonDSL._
import net.liftweb.json.JsonDSL._
scala> import net.liftweb.json.Printer._
import net.liftweb.json.Printer._
scala> val json1 = ("foo" -> 4) ~ ("bar" -> "baz")
json1: net.liftweb.json.JsonAST.JObject = JObject(List(JField(foo,JInt(4)), JField(bar,JString(baz))))
scala> compact(JsonAST.render(json1))
res0: String = {"foo":4,"bar":"baz"}
scala> val json2 = List(1,2,3)
json2: List[Int] = List(1, 2, 3)
scala> compact(JsonAST.render(json2))
res1: String = [1,2,3]
scala> val json3 = ("foo", 4) ~ ("bar", List(1,2,3))
json3: net.liftweb.json.JsonAST.JObject = JObject(List(JField(foo,JInt(4)), JField(bar,JArray(List(JInt(1), JInt(2), JInt(3))))))
scala> compact(JsonAST.render(json3))
res2: String = {"foo":4,"bar":[1,2,3]}
base/lift-json/)库解析JSON
例:
scala> import scala.xml.dtd.PublicID
import scala.xml.dtd.PublicID
scala> import net.liftweb.json._
import net.liftweb.json._
scala> import net.liftweb.json.JsonAST._
import net.liftweb.json.JsonAST._
scala> import net.liftweb.json.JsonDSL._
import net.liftweb.json.JsonDSL._
scala> implicit val formats = DefaultFormats
formats: net.liftweb.json.DefaultFormats.type = net.liftweb.json.DefaultFormats$@7fa27edd
scala> val jsonAst = ("publicId1" -> "idString") ~ ("systemId" -> "systemIdStr")
jsonAst: net.liftweb.json.JsonAST.JObject = JObject(List(JField(publicId,JString(idString)), JField(systemId,JString(systemIdStr))))
scala> jsonAst.extract[PublicID]
res0: scala.xml.dtd.PublicID = PUBLIC "idString" "systemIdStr"
例:
scala>import scala.util.parsing.json.JSON._
import scala.util.parsing.json.JSON._
scala> parseFull("{\"foo\" : 4 }")
res1: Option[Any] = Some(Map(foo -> 4.0))
scala> parseFull("[ 1,2,3 ]")
res2: Option[Any] = Some(List(1.0, 2.0, 3.0))
scala> parseFull("{'foo' : 4 }")
res3: Option[Any] = None
tools.org/mvnsites/liftweb-2.0/framework/scaladocs/net/liftweb/util/JSONParser$object.html)在Lift 2.0和2.2中解析JSON
例:
scala> import net.liftweb.util.JSONParser._
import net.liftweb.util.JSONParser._
scala> parse("{\"foo\" : 4 }")
res1: net.liftweb.common.@R_490_2419@[Any] = Full(Map(foo -> 4.0))
scala> parse("[ 1,2,3 ]")
res2: net.liftweb.common.@R_490_2419@[Any] = Full(List(1.0, 2.0, 3.0))
scala> parse("{'foo' : 4}")
res3: net.liftweb.common.@R_490_2419@[Any] = Full(Map(foo -> 4.0))
tools.org/mvnsites/liftweb-2.0/framework/scaladocs/net/liftweb/json/JsonParser$object.html)在Lift 2.0和2.2中解析JSON
例:
scala> import net.liftweb.json._
import net.liftweb.json._
scala> import net.liftweb.json.JsonParser._
import net.liftweb.json.JsonParser._
scala> parse("{\"foo\" : 4 }")
res1: net.liftweb.json.JsonAST.JValue = JObject(List(JField(foo,JInt(4))))
scala> parse("[ 1,2,3 ]")
res2: net.liftweb.json.JsonAST.JValue = JArray(List(JInt(1), JInt(2), JInt(3)))
scala> parse("{'foo' : 4}")
net.liftweb.json.JsonParser$ParseException: unkNown token '
Near: {'foo' : 4}
at net.liftweb.json.JsonParser$Parser.fail(JsonParser.scala:216)
at net.liftweb.json.JsonParser$Parser.nextToken(JsonParser.scala:308)
at net.liftweb.json.JsonParser$$anonfun$1.apply(JsonParser.scala:172)
at net.liftweb.json.JsonParser$$anonfun$1.apply(JsonParser.scala:129)
at net.liftweb.json.JsonParse...
例:
scala> import net.liftweb.http.js._
import net.liftweb.http.js._
scala> import net.liftweb.http.js.JE._
import net.liftweb.http.js.JE._
scala> JsObj(("foo", 4), ("bar", "baz")).toJsCmd
res0: String = {'foo': 4, 'bar': 'baz'}
scala> JsArray(1,2,3).toJsCmd
res1: String =
[1, 2, 3]
scala> JsObj(("foo", 4), ("bar", JsArray(1,2,3))).toJsCmd
res2: String =
{'foo': 4, 'bar': [1, 2, 3]
}
例:
scala> import net.liftweb.http.js._
import net.liftweb.http.js._
scala> import net.liftweb.http.js.JE._
import net.liftweb.http.js.JE._
scala> JsObj(("foo", 4), ("bar", "baz")).toJsCmd
res0: String = {"foo": 4, "bar": "baz"}
scala> JsArray(1,2,3).toJsCmd
res1: String =
[1, 2, 3]
scala> JsObj(("foo", 4), ("bar", JsArray(1,2,3))).toJsCmd
res3: String =
{"foo": 4, "bar": [1, 2, 3]
}
例:
scala> import scala.util.parsing.json._
import scala.util.parsing.json._
scala> JSONObject (Map ("foo" -> 4, "bar" -> JSONArray (1 :: 2 :: 3 :: Nil))) .toString()
res0: String = {"foo" : 4, "bar" : [1, 2, 3]}