Jackson Scala模块的小例子？ [英] Small Example of Jackson Scala Module?

问题描述

有人能指出我的Scala模块2.10的杰克逊序列化/反序列化的简单例子吗？我正在寻找基于反射的JSON，不需要逐个字段的注释或赋值，它似乎可以做到这一点，但它们的文档中没有包含任何示例。

Can anyone point me towards a simple example of Jackson serialization/deserialization with their Scala module for 2.10? I'm looking for reflection-based JSON not requiring field-by-field annotation or assignment and it seemed this could do that, but their documentation includes no examples.

如果我有一个案例类：

case class Person(name:String, age:Int)
val person = Person("Fred", 65)

所以从他们的github自述文件：

So from their github readme:

val mapper = new ObjectMapper()
mapper.registerModule(DefaultScalaModule)

好的，现在是什么......？如何将p转换为/从JSON？

OK, now what...? How to I convert p to/from JSON?

推荐答案

给这一点：

val person = Person("fred", 25)
val mapper = new ObjectMapper()
mapper.registerModule(DefaultScalaModule)    

val out = new StringWriter
mapper.writeValue(out, person)
val json = out.toString()
println(json)

val person2 = mapper.readValue(json, classOf[Person])
println(person2)

编辑

请务必将 Person 类声明为最高级别否则不起作用。

Just be sure to declare the Person class as top level as it will not work otherwise.

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