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24
4
下面是 Twitter 推文的 json 示例。这是一个很大的 json。将它解析为 Scala 中的案例类的最佳库/方法是什么？
例如，在 Play Framework 2.x 中，可以通过定义案例类和隐式转换使用它的内部库来做到这一点，但在这种情况下我不使用 Play。我应该吗？
spray-json 似乎是最流行的 scala json 库，但在这种情况下它看起来相当令人失望 - 标准方法似乎仅限于 22 个元素并使用模式匹配，这在具有数百个元素的多嵌套结构的上下文。有什么想法吗？
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"created_at": "Sat Oct 24 06:44:34 +0000 2015",
"id": 657809891558576132,
"id_str": "657809891558576132",
"text": "RT @M23projects: Kara Walker \"Go to Hell or Atlanta, Whichever Come First\" @victoriamiro #London https://t.co/HapqKa4i0l https://t.co/95G…",
"source": "<a href=\"http://twitter.com/download/iphone\" rel=\"nofollow\">Twitter for iPhone</a>",
"truncated": false,
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"user": {
"id": 2792146884,
"id_str": "2792146884",
"name": "Tonbridge School Art",
"screen_name": "ArtTonSchool",
"location": "Tonbridge",
"url": null,
"description": "Tonbridge School is an independent day and boarding school for boys. Tweets by the Art Department.",
"protected": false,
"verified": false,
"followers_count": 187,
"friends_count": 288,
"listed_count": 10,
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"statuses_count": 1764,
"created_at": "Fri Sep 05 15:37:43 +0000 2014",
"utc_offset": 3600,
"time_zone": "London",
"geo_enabled": true,
"lang": "en-gb",
"contributors_enabled": false,
"is_translator": false,
"profile_background_color": "C0DEED",
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"created_at": "Sat Oct 24 02:27:06 +0000 2015",
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"text": "Kara Walker \"Go to Hell or Atlanta, Whichever Come First\" @victoriamiro #London https://t.co/HapqKa4i0l https://t.co/95GaLC4XTo",
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"user": {
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"id_str": "999716342",
"name": "M23",
"screen_name": "M23projects",
"location": "New York",
"url": "http://M23.co",
"description": "M23's project space + itinerant program promotes new work by new artists. \nhttp://Instagram.com/m23projects",
"protected": false,
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"followers_count": 9150,
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"created_at": "Sun Dec 09 17:13:35 +0000 2012",
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**更新:**我想我应该坚持使用 play-json，出于性能原因更是如此 - http://derekwyatt.org/2014/01/15/benchmarking-spray-json-argonaut-play-json/
最佳答案
你可以自己依赖 Play 的 JSON 库:
// build.sbt
libraryDependencies += "com.typesafe.play" % "play-json_2.11" % "X.X.X"
// Tweet.scala
import play.api.libs.json._
case class User(id: String, name: String, ...)
implicit val userFormat = Json.format[User]
case class Tweet(id: String, content: String, user: User)
implicit val tweetFormat = Json.format[Tweet]
这将使用 play-json 的宏来自动生成将 JSON 解析为 Tweet 和 User 实例所需的格式化程序。
无论您选择哪个库，您都找不到处理超过 22 个字段的优雅解决方案，因为这是案例类实现(直到 2.11)的限制，而不是库的任何特定设计选择。
关于json - 将大型多嵌套 json 解析为 scala 案例类，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33315766/
24
4
0
我有一些 Scala 代码，它用两个不同版本的类型参数化函数做了一些漂亮的事情。我已经从我的应用程序中简化了很多，但最后我的代码充满了形式 w(f[Int],f[Double]) 的调用。哪里w()是
如果我在同一目录中有两个单独的未编译的 scala 文件: // hello.scala object hello { def world() = println("hello world") }
val schema = df.schema val x = df.flatMap(r => (0 until schema.length).map { idx => ((idx, r.g
环境: Play 2.3.0/Scala 2.11.1/IntelliJ 13.1 我使用 Typesafe Activator 1.2.1 用 Scala 2.11.1 创建一个新项目。项目创建好后
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我已经根据 README.md 文件安装了 ensime，但是，我在低级 ensime-server 缓冲区中出现以下错误: 信息: fatal error :scala.tools.nsc.Miss
我正在阅读《Scala 编程》一书。在书中，它说“一个函数文字被编译成一个类，当在运行时实例化时它是一个函数值”。并且它提到“函数值是对象，因此您可以根据需要将它们存储在变量中”。 所以我尝试检查函数
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有没有办法在 Scala 2.11 中使用 scala-pickling？ 我在 sonatype 存储库中尝试了唯一的 scala-pickling_2.11 工件，但它似乎不起作用。我收到消息:
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我正在阅读《Scala 编程》一书，并在第 6 章中的类 Rational 实现中遇到了一些问题。 这是我的 Rational 类的初始版本(基于本书) class Rational(numerato
我是 Scala 新手，我正在尝试开发一个使用自定义库的小项目。我在库内创建了一个mysql连接池。这是我的库的build.sbt organization := "com.learn" name :
我正在尝试运行一些 Scala 代码，只是暂时打印出“Hello”，但我希望在 SBT 项目中编译 Scala 代码之前运行 Scala 代码。我发现在 build.sbt 中有以下工作。 compi
Here链接到 maven Scala 插件使用。但没有提到它使用的究竟是什么 Scala 版本。我创建了具有以下配置的 Maven Scala 项目: org.scala-tools
我对 Scala 还很陌生，请多多包涵。我有一堆包裹在一个大数组中的 future 。 future 已经完成了查看几 TB 数据的辛勤工作，在我的应用程序结束时，我想总结上述 future 的所有结
我有一个 scala 宏，它依赖于通过包含其位置的静态字符串指定的任意 xml 文件。 def myMacro(path: String) = macro myMacroImpl def myMacr
这是我的功能: def sumOfSquaresOfOdd(in: Seq[Int]): Int = { in.filter(_%2==1).map(_*_).reduce(_+_) } 为什么我
这个问题在这里已经有了答案: Calculating the difference between two Java date instances (45 个答案) 关闭 5 年前。 所以我有一个这
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