scala 将Scala列表转换为Json对象
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Convert scala list to Json object
提问by malmling
I want to convert a scala list of strings, List[String], to an Json object.
我想将 Scala 字符串列表 List[String] 转换为 Json 对象。
For each string in my list I want to add it to my Json object.
对于列表中的每个字符串，我想将其添加到我的 Json 对象中。
So that it would look like something like this:
所以它看起来像这样：
{
"names":[
{
"Bob",
"Andrea",
"Mike",
"Lisa"
}
]
}
How do I create an json object looking like this, from my list of strings?
如何从我的字符串列表中创建一个看起来像这样的 json 对象？
回答by Impredicative
To directly answer your question, a very simplistic and hacky way to do it:
要直接回答您的问题，这是一种非常简单和 hacky 的方法：
val start = """"{"names":[{"""
val end = """}]}"""
val json = mylist.mkString(start, ",", end)
However, what you almost certainly want to do is pick one of the many JSON libraries out there: play-jsongets some good comments, as does lift-json. At the worst, you could just grab a simple JSON library for Java and use that.
但是，您几乎肯定想要做的是从众多 JSON 库中选择一个：play-json得到了一些好评，lift-json 也是如此。在最坏的情况下，您可以只获取一个简单的 Java JSON 库并使用它。
回答by Dylan
Since I'm familiar with lift-json, I'll show you how to do it with that library.
由于我熟悉lift-json，我将向您展示如何使用该库进行操作。
import net.liftweb.json.JsonDSL._
import net.liftweb.json.JsonAST._
import net.liftweb.json.Printer._
import net.liftweb.json.JObject
val json: JObject = "names" -> List("Bob", "Andrea", "Mike", "Lisa")
println(json)
println(pretty(render(json)))
The names -> List(...)expression is implicitly converted by the JsonDSL, since I specified that I wanted it to result in a JObject, so now jsonis the in-memory model of the json data you wanted.
该names -> List(...)表达式由 JsonDSL 隐式转换，因为我指定我希望它产生 a JObject，所以现在json是您想要的 json 数据的内存模型。
prettycomes from the Printerobject, and rendercomes from the JsonASTobject. Combined, they create a Stringrepresentation of your data, which looks like
pretty来自Printer对象，render来自JsonAST对象。结合起来，它们创建了String您的数据的表示，看起来像
{
"names":["Bob","Andrea","Mike","Lisa"]
}
Be sure to check out the lift documentation, where you'll likely find answers to any further questions about lift's json support.
请务必查看提升文档，您可能会在其中找到有关提升的 json 支持的任何其他问题的答案。
