Scala 如何提取用于理解的JSON值
我想提取JSON值以便于理解 我的代码是:Scala 如何提取用于理解的JSON值,scala,lift-json,Scala,Lift Json,我想提取JSON值以便于理解 我的代码是: import net.liftweb.json._ val json = parse(""" { "took": 212, "timed_out": false, "_shards": { "total": 5, "successful": 5, "failed": 0 }, "hits": { "total": 4, "
import net.liftweb.json._
val json = parse("""
{
"took": 212,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 4,
"max_score": 0.625,
"hits": [
{
"_index": "siteindex",
"_type": "posts",
"_id": "1",
"_score": 0.625,
"_source": {
"title": "title 1",
"content": "content 1"
},
"highlight": {
"title": [
"<b>title</b> 1"
]
}
},
{
"_index": "siteindex",
"_type": "posts",
"_id": "4",
"_score": 0.19178301,
"_source": {
"title": "title 4",
"content": "content 4"
},
"highlight": {
"title": [
"<b>title</b> 4"
]
}
},
{
"_index": "siteindex",
"_type": "posts",
"_id": "2",
"_score": 0.19178301,
"_source": {
"title": "title 2",
"content": "content 2"
},
"highlight": {
"title": [
"<b>title</b> 2"
]
}
},
{
"_index": "siteindex",
"_type": "posts",
"_id": "3",
"_score": 0.19178301,
"_source": {
"title": "title 3",
"content": "content 3"
},
"highlight": {
"title": [
"<b>title</b> 3"
]
}
}
]
}
}
""")
我的“for”是:
直到这里一切都好
但现在我需要这样的东西:
List(Document2(1,<b>title</b> 1,content 1), Document2(4,<b>title</b> 4,content 4), Document2(2,<b>title</b> 2,content 2), Document2(3,<b>title</b> 3,content 3))
在我的名单上
我的“案例类”是:
我试过这个,但不起作用
val ret: List[Document2] = for {
JObject(child) <- json
JField("_id", JString(_id)) <- child
JField("title", JString(title)) <- child
JField("content", JString(content)) <- child
} yield (Document2( _id, title, content ))
val ret:List[Document2]=for{
JObject(child)这里有一个类似于@flav的方法的答案,但我将为您提供映射到json的结构以及如何获得最终结果。首先,案例类:
case class Document2(_id:String, title:String, content:String)
case class Results(hits:HitsList)
case class HitsList(hits:List[Hit])
case class Hit(_id:String, _source:Source, highlight:Highlight)
case class Source(title:String, content:String)
case class Highlight(title:List[String])
然后,解析和转换它的代码:
implicit val formats = DefaultFormats
val results = json.extract[Results]
val docs2 = results.hits.hits.map{ hit =>
Document2(hit._id, hit.highlight.title.head, hit._source.content)
}
"highlight": {
"title": [
"<b>*</b> *"
]
}
"_id": "*",
case class Document2(_id:String, title:String, content:String)
val ret: List[Document2] = for {
JObject(child) <- json
JField("_id", JString(_id)) <- child
JField("title", JString(title)) <- child
JField("content", JString(content)) <- child
} yield (Document2( _id, title, content ))
<console>:23: warning: `withFilter' method does not yet exist on net.liftweb.json.JValue, using `filter' method instead
JObject(child) <- json
ret: List[Document2] = List()
case class Document2(_id:String, title:String, content:String)
case class Results(hits:HitsList)
case class HitsList(hits:List[Hit])
case class Hit(_id:String, _source:Source, highlight:Highlight)
case class Source(title:String, content:String)
case class Highlight(title:List[String])
implicit val formats = DefaultFormats
val results = json.extract[Results]
val docs2 = results.hits.hits.map{ hit =>
Document2(hit._id, hit.highlight.title.head, hit._source.content)
}