使用 Json Stream 进行反序列化
代码如下:
import encoding.json.stream.*
import std.io.*
import std.collection.*
class A <: JsonDeserializable<A> {
var key1: Option<String> = None
var key2: Bool = false
var key3: Float64 = 0.0
var key4: String = ""
var key5: Array<Int64> = Array<Int64>()
var key6: HashMap<String, String> = HashMap<String, String>()
public static func fromJson(r: JsonReader): A {
var res = A()
while (let Some(v) <- r.peek()) {
match(v) {
case BeginObject =>
r.startObject()
while(r.peek() != EndObject) {
let n = r.readName()
match (n) {
case "key1" => res.key1 = r.readValue<Option<String>>()
case "key2" => res.key2 = r.readValue<Bool>()
case "key3" => res.key3 = r.readValue<Float64>()
case "key4" => res.key4 = r.readValue<String>()
case "key5" => res.key5 = r.readValue<Array<Int64>>()
case "key6" => res.key6 = r.readValue<HashMap<String, String>>()
case _ => ()
}
}
r.endObject()
break
case _ => throw Exception()
}
}
return res
}
func toString(): String {
return "${key1}\n${key2}\n${key3}\n${key4}\n${key5}\n${key6}"
}
}
main() {
let jsonStr = ##"{"key1": null, "key2": true, "key3": 123.456, "key4": "string", "key5": [123, 456], "key6": {"key7": " ", "key8": "\\a"}}"##
var bas = ByteBuffer()
unsafe { bas.write(jsonStr.rawData()) }
var reader = JsonReader(bas)
var obj = A.fromJson(reader)
println(obj.toString())
}
运行结果如下:
None
true
123.456000
string
[123, 456]
[(key7, ), (key8, \a)]