我有一个名为child2的类，我希望序列化和反序列化我的类包含一个LocalDateTime属性，我必须编写一个自定义序列化程序，我尝试使用这两个解决方案，但两者都抛出异常 这是我的代码
解决方案1
case class Child2(var str:String,var Num:Int,MyList:List[Int],val myDate : LocalDateTime = LocalDateTime.now()){
var number:Int=555
}
class Message1SerializerDateTime extends Serializer[LocalDateTime]{
private val LocalDateTimeClass = classOf[LocalDateTime]
def deserialize(implicit format: Formats): PartialFunction[(TypeInfo, JValue), LocalDateTime] = {
case (TypeInfo(LocalDateTimeClass, _), json) => json match {
case JString(dt) => LocalDateTime.parse(dt)
case x => throw new MappingException("Can't convert " + x + " to LocalDateTime")
}
}
def serialize(implicit format: Formats): PartialFunction[Any, JValue] = {
case x: LocalDateTime => JString(x.toString)
}
}
object MessageTest extends App {
implicit val formats = /*Serialization.formats(NoTypeHints)*/DefaultFormats + new FieldSerializer[Child2]+new Message1SerializerDateTime
var c= new Child2("Mary", 5,List(1, 2),LocalDateTime.now())
c.number=1
// println("number"+c.number)
val ser = write(c)
println("Child class converted to string" +ser)
var obj=read[Child2](ser)
println("object of Child is "+obj)
println("str"+obj.str)
println("Num"+obj.Num)
println("MyList"+obj)
println("myDate"+obj.myDate)
println("number"+obj.number)
}
及其投掷mapping exception
Child class converted to string{"number":1,"str":"Mary","Num":5,"MyList":[1,2],"myDate":"2015-07-28T16:45:44.030"}
[error] (run-main-2) net.liftweb.json.MappingException: unknown error
net.liftweb.json.MappingException: unknown error
at net.liftweb.json.Extraction$.extract(Extraction.scala:46)
at net.liftweb.json.JsonAST$JValue.extract(JsonAST.scala:312)
at net.liftweb.json.Serialization$.read(Serialization.scala:58)
at MessageTest$.delayedEndpoint$MessageTest$1(MessageTest.scala:42)
at MessageTest$delayedInit$body.apply(MessageTest.scala:15)
at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
at scala.App$$anonfun$main$1.apply(App.scala:76)
at scala.App$$anonfun$main$1.apply(App.scala:76)
at scala.collection.immutable.List.foreach(List.scala:383)
at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
at scala.App$class.main(App.scala:76)
at MessageTest$.main(MessageTest.scala:15)
at MessageTest.main(MessageTest.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 49938
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.<init>(BytecodeReadingParanamer.java:451)
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.<init>(BytecodeReadingParanamer.java:431)
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.<init>(BytecodeReadingParanamer.java:492)
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.<init>(BytecodeReadingParanamer.java:337)
at com.thoughtworks.paranamer.BytecodeReadingParanamer.lookupParameterNames(BytecodeReadingParanamer.java:100)
at com.thoughtworks.paranamer.CachingParanamer.lookupParameterNames(CachingParanamer.java:75)
at com.thoughtworks.paranamer.CachingParanamer.lookupParameterNames(CachingParanamer.java:68)
at net.liftweb.json.Meta$ParanamerReader$.lookupParameterNames(Meta.scala:89)
at net.liftweb.json.Meta$Reflection$.argsInfo$1(Meta.scala:237)
at net.liftweb.json.Meta$Reflection$.constructorArgs(Meta.scala:253)
at net.liftweb.json.Meta$Reflection$$anonfun$constructors$1.apply(Meta.scala:227)
at net.liftweb.json.Meta$Reflection$$anonfun$constructors$1.apply(Meta.scala:227)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:245)
at scala.collection.mutable.ArrayOps$ofRef.map(ArrayOps.scala:186)
at net.liftweb.json.Meta$Reflection$.constructors(Meta.scala:227)
at net.liftweb.json.Meta$.net$liftweb$json$Meta$$constructors$1(Meta.scala:97)
at net.liftweb.json.Meta$.mkConstructor$1(Meta.scala:124)
at net.liftweb.json.Meta$.fieldMapping$1(Meta.scala:151)
at net.liftweb.json.Meta$.net$liftweb$json$Meta$$toArg$1(Meta.scala:155)
at net.liftweb.json.Meta$$anonfun$net$liftweb$json$Meta$$constructors$1$1$$anonfun$apply$1.apply(Meta.scala:99)
at net.liftweb.json.Meta$$anonfun$net$liftweb$json$Meta$$constructors$1$1$$anonfun$apply$1.apply(Meta.scala:98)
at scala.collection.immutable.List.map(List.scala:278)
at net.liftweb.json.Meta$$anonfun$net$liftweb$json$Meta$$constructors$1$1.apply(Meta.scala:98)
at net.liftweb.json.Meta$$anonfun$net$liftweb$json$Meta$$constructors$1$1.apply(Meta.scala:97)
at scala.collection.immutable.List.map(List.scala:274)
at net.liftweb.json.Meta$.net$liftweb$json$Meta$$constructors$1(Meta.scala:97)
at net.liftweb.json.Meta$$anonfun$mappingOf$1.apply(Meta.scala:169)
at net.liftweb.json.Meta$$anonfun$mappingOf$1.apply(Meta.scala:161)
at net.liftweb.json.Meta$Memo.memoize(Meta.scala:199)
at net.liftweb.json.Meta$.mappingOf(Meta.scala:161)
at net.liftweb.json.Extraction$.net$liftweb$json$Extraction$$mkMapping$1(Extraction.scala:194)
at net.liftweb.json.Extraction$.net$liftweb$json$Extraction$$extract0(Extraction.scala:199)
at net.liftweb.json.Extraction$.extract(Extraction.scala:43)
at net.liftweb.json.JsonAST$JValue.extract(JsonAST.scala:312)
at net.liftweb.json.Serialization$.read(Serialization.scala:58)
at MessageTest$.delayedEndpoint$MessageTest$1(MessageTest.scala:42)
at MessageTest$delayedInit$body.apply(MessageTest.scala:15)
at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
at scala.App$$anonfun$main$1.apply(App.scala:76)
at scala.App$$anonfun$main$1.apply(App.scala:76)
at scala.collection.immutable.List.foreach(List.scala:383)
at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
at scala.App$class.main(App.scala:76)
at MessageTest$.main(MessageTest.scala:15)
at MessageTest.main(MessageTest.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
解决方案2
case class Child2(var str:String,var Num:Int,MyList:List[Int],val myDate : LocalDateTime = LocalDateTime.now()){
var number:Int=555
}
class Message1Serializer extends Serializer[Child2]{
private val IntervalClass = classOf[Child2]
def deserialize(implicit format: Formats): PartialFunction[(TypeInfo, JValue), Child2] = {
case (TypeInfo(IntervalClass, _), json) => json match {
case JObject(
JField("str", JString(str)) :: JField("Num", JInt(num)) ::
JField("MyList", JArray(mylist)) :: (JField("myDate", JString(mydate)) ::
JField("number", JInt(number)) ::Nil)
) => {
val c = Child2(
str, num.intValue(), mylist.map(_.values.toString.toInt), LocalDateTime.parse(mydate)
)
c.number = number.intValue()
c
}
case x => throw new MappingException("Can't convert " + x + " to Interval")
}
}
def serialize(implicit format: Formats): PartialFunction[Any, JValue] = {
case x: Child2 =>
JObject(
JField("str", JString(x.str)) :: JField("Num", JInt(x.Num)) ::
JField("MyList", JArray(x.MyList.map(JInt(_)))) ::
JField("myDate", JString(x.myDate.toString)) ::
JField("number", JInt(x.number)) :: Nil
)
}
}
object MessageTest extends App
{
implicit val formats = /*Serialization.formats(NoTypeHints)*/DefaultFormats+new Message1Serializer
var c= new Child2("Mary", 5,List(1, 2),LocalDateTime.now())
c.number=1
// println("number"+c.number)
val ser = write(c)
println("Child class converted to string" +ser)
var obj=read[Child2](ser)
println("object of Child is "+obj)
println("str"+obj.str)
println("Num"+obj.Num)
println("MyList"+obj)
println("myDate"+obj.myDate)
println("number"+obj.number)
}
它还抛出映射异常
Child class converted to string{"str":"Mary","Num":5,"MyList":[1,2],"myDate":"2015-07-28T17:09:31.512","number":1}
[error] (run-main-1) net.liftweb.json.MappingException: unknown error
net.liftweb.json.MappingException: unknown error
at net.liftweb.json.Extraction$.extract(Extraction.scala:46)
at net.liftweb.json.JsonAST$JValue.extract(JsonAST.scala:312)
at net.liftweb.json.Serialization$.read(Serialization.scala:58)
at MessageTest$.delayedEndpoint$MessageTest$1(MessageTest.scala:58)
at MessageTest$delayedInit$body.apply(MessageTest.scala:15)
at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
at scala.App$$anonfun$main$1.apply(App.scala:76)
at scala.App$$anonfun$main$1.apply(App.scala:76)
at scala.collection.immutable.List.foreach(List.scala:383)
at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
at scala.App$class.main(App.scala:76)
at MessageTest$.main(MessageTest.scala:15)
at MessageTest.main(MessageTest.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 49938
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.<init>(BytecodeReadingParanamer.java:451)
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.<init>(BytecodeReadingParanamer.java:431)
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.<init>(BytecodeReadingParanamer.java:492)
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.<init>(BytecodeReadingParanamer.java:337)
at com.thoughtworks.paranamer.BytecodeReadingParanamer.lookupParameterNames(BytecodeReadingParanamer.java:100)
at com.thoughtworks.paranamer.CachingParanamer.lookupParameterNames(CachingParanamer.java:75)
at com.thoughtworks.paranamer.CachingParanamer.lookupParameterNames(CachingParanamer.java:68)
at net.liftweb.json.Meta$ParanamerReader$.lookupParameterNames(Meta.scala:89)
at net.liftweb.json.Meta$Reflection$.argsInfo$1(Meta.scala:237)
at net.liftweb.json.Meta$Reflection$.constructorArgs(Meta.scala:253)
at net.liftweb.json.Meta$Reflection$$anonfun$constructors$1.apply(Meta.scala:227)
at net.liftweb.json.Meta$Reflection$$anonfun$constructors$1.apply(Meta.scala:227)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:245)
at scala.collection.mutable.ArrayOps$ofRef.map(ArrayOps.scala:186)
at net.liftweb.json.Meta$Reflection$.constructors(Meta.scala:227)
at net.liftweb.json.Meta$.net$liftweb$json$Meta$$constructors$1(Meta.scala:97)
at net.liftweb.json.Meta$.mkConstructor$1(Meta.scala:124)
at net.liftweb.json.Meta$.fieldMapping$1(Meta.scala:151)
at net.liftweb.json.Meta$.net$liftweb$json$Meta$$toArg$1(Meta.scala:155)
at net.liftweb.json.Meta$$anonfun$net$liftweb$json$Meta$$constructors$1$1$$anonfun$apply$1.apply(Meta.scala:99)
at net.liftweb.json.Meta$$anonfun$net$liftweb$json$Meta$$constructors$1$1$$anonfun$apply$1.apply(Meta.scala:98)
at scala.collection.immutable.List.map(List.scala:278)
at net.liftweb.json.Meta$$anonfun$net$liftweb$json$Meta$$constructors$1$1.apply(Meta.scala:98)
at net.liftweb.json.Meta$$anonfun$net$liftweb$json$Meta$$constructors$1$1.apply(Meta.scala:97)
at scala.collection.immutable.List.map(List.scala:274)
at net.liftweb.json.Meta$.net$liftweb$json$Meta$$constructors$1(Meta.scala:97)
at net.liftweb.json.Meta$$anonfun$mappingOf$1.apply(Meta.scala:169)
at net.liftweb.json.Meta$$anonfun$mappingOf$1.apply(Meta.scala:161)
at net.liftweb.json.Meta$Memo.memoize(Meta.scala:199)
at net.liftweb.json.Meta$.mappingOf(Meta.scala:161)
at net.liftweb.json.Extraction$.net$liftweb$json$Extraction$$mkMapping$1(Extraction.scala:194)
at net.liftweb.json.Extraction$.net$liftweb$json$Extraction$$extract0(Extraction.scala:199)
at net.liftweb.json.Extraction$.extract(Extraction.scala:43)
at net.liftweb.json.JsonAST$JValue.extract(JsonAST.scala:312)
at net.liftweb.json.Serialization$.read(Serialization.scala:58)
at MessageTest$.delayedEndpoint$MessageTest$1(MessageTest.scala:58)
at MessageTest$delayedInit$body.apply(MessageTest.scala:15)
at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
at scala.App$$anonfun$main$1.apply(App.scala:76)
at scala.App$$anonfun$main$1.apply(App.scala:76)
at scala.collection.immutable.List.foreach(List.scala:383)
at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
at scala.App$class.main(App.scala:76)
at MessageTest$.main(MessageTest.scala:15)
at MessageTest.main(MessageTest.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
请帮助我如何解决这个问题。如何为java 8 LocalDateTime编写序列化程序
答案 0 :(得分：1)
我依稀记得有类似的问题，我解决了 通过解析相应的DateTimeFormat类
LocalDateTime.parse(dt, DateTimeFormatter.ofPattern("yyyy-MM-ddTHH:mm"))
纠正案件的模式