如何在Scala/Lift中构造和解析JSON字符串_Json_Scala_Lift

如何在Scala/Lift中构造和解析JSON字符串

json scala

如何在Scala/Lift中构造和解析JSON字符串,json,scala,lift,Json,Scala,Lift,我正在尝试使用JSON在浏览器和我的应用程序之间发送数据我试图使用Lift 1.0创建和解析JSON字符串，但由于某些原因，我无法解析我刚才构建的JSON： scala>import scala.util.parsing.json.JSON._ import scala.util.parsing.json.JSON._ scala> import net.liftweb.http.js._ import net.liftweb.http.js._ scala> impor

我正在尝试使用JSON在浏览器和我的应用程序之间发送数据

我试图使用Lift 1.0创建和解析JSON字符串，但由于某些原因，我无法解析我刚才构建的JSON：

scala>import scala.util.parsing.json.JSON._
import scala.util.parsing.json.JSON._

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> val json = JsObj(("foo", 4), ("bar", "baz")).toJsCmd
json: String = {'foo': 4, 'bar': 'baz'}

scala>  parseFull(json)  
res3: Option[Any] = None

如何以编程方式在Scala/Lift中构造一条也可以再次解析的有效JSON消息？

您正在使用Lift 1.0的

JsCmd

，它生成带有单引号字符串的JSON，并尝试使用Scala的解析器解析它，后者只支持双引号字符串

认识到JSON有多种定义是很重要的

单引号字符串在JSON中有效吗

它们是根据
它们不是根据Crockford的原作

Lift和Scala提供了许多解析JSON的方法，有时不同版本之间的行为有所不同

这些解析器接受的字符串是不等价的

下面是一些注释和示例，介绍了生成和解析JSON字符串的各种方法

使用库DSL生成JSON

推荐
尽管名称不同，但这是一个独立的项目，不依赖于Lift的其余部分

例如：

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]}

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"

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

scala> import net.liftweb.util.JSONParser._
import net.liftweb.util.JSONParser._

scala> parse("{\"foo\" : 4 }")    
res1: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

scala> parse("[ 1,2,3 ]")
res2: net.liftweb.common.Box[Any] = Full(List(1.0, 2.0, 3.0))

scala> parse("{'foo' : 4}")           
res3: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

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...

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]
}

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]
}

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]}

使用库解析JSON

推荐
提供与scala案例类之间的隐式映射

当前不支持控制台中定义的案例类（将抛出

com.thoughtworks.paranamer.ParameterNamesNotFoundException:无法获取类字节

）

下面的示例使用了
，这是一个预先存在的scala案例类，因此它可以在scala控制台上工作

例如：

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]}

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"

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

scala> import net.liftweb.util.JSONParser._
import net.liftweb.util.JSONParser._

scala> parse("{\"foo\" : 4 }")    
res1: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

scala> parse("[ 1,2,3 ]")
res2: net.liftweb.common.Box[Any] = Full(List(1.0, 2.0, 3.0))

scala> parse("{'foo' : 4}")           
res3: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

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...

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]
}

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]
}

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]}

在scala 2.7.7和2.8.1中解析JSON

不推荐-“”
Scala 2.7.7的解析器不会解析单引号的JSON
这是问题中使用的解析方法

例如：

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]}

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"

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

scala> import net.liftweb.util.JSONParser._
import net.liftweb.util.JSONParser._

scala> parse("{\"foo\" : 4 }")    
res1: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

scala> parse("[ 1,2,3 ]")
res2: net.liftweb.common.Box[Any] = Full(List(1.0, 2.0, 3.0))

scala> parse("{'foo' : 4}")           
res3: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

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...

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]
}

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]
}

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]}

使用解析lift2.0和2.2中的JSON

中立建议
Lift的util.JSONParser将解析单引号或双引号的JSON字符串：

例如：

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]}

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"

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

scala> import net.liftweb.util.JSONParser._
import net.liftweb.util.JSONParser._

scala> parse("{\"foo\" : 4 }")    
res1: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

scala> parse("[ 1,2,3 ]")
res2: net.liftweb.common.Box[Any] = Full(List(1.0, 2.0, 3.0))

scala> parse("{'foo' : 4}")           
res3: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

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...

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]
}

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]
}

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]}

使用解析lift2.0和2.2中的JSON

中立建议
Lift的json.JsonParser不会解析单引号的json字符串：

例如：

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]}

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"

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

scala> import net.liftweb.util.JSONParser._
import net.liftweb.util.JSONParser._

scala> parse("{\"foo\" : 4 }")    
res1: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

scala> parse("[ 1,2,3 ]")
res2: net.liftweb.common.Box[Any] = Full(List(1.0, 2.0, 3.0))

scala> parse("{'foo' : 4}")           
res3: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

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...

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]
}

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]
}

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]}

使用lift1.0jscmd生成JSON

不建议使用-输出对所有JSON解析器无效
请注意字符串周围的单个引号：

例如：

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]}

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"

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

scala> import net.liftweb.util.JSONParser._
import net.liftweb.util.JSONParser._

scala> parse("{\"foo\" : 4 }")    
res1: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

scala> parse("[ 1,2,3 ]")
res2: net.liftweb.common.Box[Any] = Full(List(1.0, 2.0, 3.0))

scala> parse("{'foo' : 4}")           
res3: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

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...

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]
}

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]
}

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]}

使用lift2.0jscmd生成JSON

中立建议
请注意字符串周围的双引号：

例如：

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]}

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"

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

scala> import net.liftweb.util.JSONParser._
import net.liftweb.util.JSONParser._

scala> parse("{\"foo\" : 4 }")    
res1: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

scala> parse("[ 1,2,3 ]")
res2: net.liftweb.common.Box[Any] = Full(List(1.0, 2.0, 3.0))

scala> parse("{'foo' : 4}")           
res3: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

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...

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]
}

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]
}

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]}

在scala中生成JSON（使用2.10进行测试）

“”但它是有效的，它就在那里

例如：

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]}

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"

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

scala> import net.liftweb.util.JSONParser._
import net.liftweb.util.JSONParser._

scala> parse("{\"foo\" : 4 }")    
res1: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

scala> parse("[ 1,2,3 ]")
res2: net.liftweb.common.Box[Any] = Full(List(1.0, 2.0, 3.0))

scala> parse("{'foo' : 4}")           
res3: net.liftweb.common.Box[Any] = Full(Map(foo -> 4.0))

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...

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]
}

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]
}

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]}

看一看。它使用起来非常好，并且利用了和中的一些新工具。另外，您可以从中使用它

摘自：

scala>导入io.circe.，io.circe.generic.auto.，io.circe.parser。， io.circe.syntax。导入io.circe.\导入io.circe.generic.auto_ 导入io.circe.parser.\uImport io.circe.syntax_

scala>密封特征Foo定义的特征Foo

scala>case类栏（xs:List[String]）扩展了Foo定义的类栏

scala>case类Qux（i:Int，d:Option[Double]）扩展了Foo定义的类群

scala>valfoo:foo=Qux（13，一些（14.0））foo:foo= Qux（13，部分（14.0））

scala>foo.asJson.noSpaces res0:String={“Qux”：{“d”：14.0，“i”：13}

scala>decodeFoo res1： cats.data.Xor[io.circe.Error，Foo]=Right（Qux（13，Some（14.0）））

这是一个很好的回应，但现在感觉有点过时了。然而，我不知道对条目进行主要编辑是否被接受。对我来说，主要的问题是应该有对twitterjson库（基于scalajson）和Jerkson库（使用Jackson）的引用。此外，对内置Scala支持的引用并未提及Scala 2.9.x。因此，SO的最初目标是避免在线论坛的问题——帖子永远存在，但最终会过时，没有人会反对它们或将它们标记为不再相关。考虑到这一点，再加上这是一个社区维基答案，我建议你改变！您在声明ECMA第五版时不正确。指定JSON字符串可以有单引号。在第202页，规范明确规定了双引号。因此，也会使您关于多个标准的声明无效。Crockford定义了一个单一的JSON标准，随后被纳入ECMA第五版规范。使用单引号生成或验证JSON字符串的实现无效。我正在尝试使用lift JSON库将映射转换为JSON。这是我的代码：var x=compact（JsonAST.render（y）），这里y是一个映射。我得到以下错误：类型不匹配；找到[错误]：scala.collection.immutable.Map[String，List[String]][error]必需：net.liftweb.json.JsonAST.JValue。我该怎么办？我甚至找不到办法把地图改成所需的格式。