仓颉应用开发之——序列化和反序列化(16)

一 概述

• 包含基本类型的数据类序列化和反序列化
• 包含序列化类的数据类序列化和反序列化
• 序列化类的调用

二 包含基本类型的数据类序列化和反序列化

2.1 说明

• 手动导包import serialization.serialization.*
• 只包含：整数(Int)、字符(Rune)、布尔(Boolean)、字符串(String)，不包含类(class)、结构体等
• 此类实现 Serializable 接口，并实现serialize序列化和deserialize反序列化方法
• serialize序列化方法：调用DataModelStruct将类对象转换位DataModel
• deserialize反序列化方法：接受一个DataModel，并将DataModel对象解析为类对象

2.2 示例

class Location <: Serializable<Location> {
    var time: Int64 = 666
    var heheh: Rune = 'T'

    /* 实现 Serializable 接口的序列化方法 */
    public func serialize(): DataModel {
        return DataModelStruct().add(field<Int64>("time", time)).add(field<Rune>("heheh", heheh))
    }

    /* 实现反序列化方法 */
    public static func deserialize(dm: DataModel): Location {
        let dms = match (dm) {
            case data: DataModelStruct => data
            case _ => throw Exception("this data is not DataModelStruct")
        }
        let result = Location()
        result.time = Int64.deserialize(dms.get("time"))
        result.heheh = Rune.deserialize(dms.get("heheh"))
        return result
    }
}

三 包含序列化类的数据类序列化和反序列化

3.1 说明

• 手动导包import serialization.serialization.*
• 除基本类型，包含序列化类型(使用Option装饰)
• 同理，序列化和反序列化方法增加对Option的支持

3.2 示例

class Abc <: Serializable<Abc> {
    var name: String = "Abcde"
    var age: Int64 = 555
    var loc: Option<Location> = Option<Location>.None

    /* 实现 Serializable 接口的序列化方法 */
    public func serialize(): DataModel {
        return DataModelStruct().add(field<String>("name", name)).add(field<Int64>("age", age)).add(field<Option<Location>>("loc", loc))
    }

    /* 实现反序列化方法 */
    public static func deserialize(dm: DataModel): Abc {
        let dms = match (dm) {
            case data: DataModelStruct => data
            case _ => throw Exception("this data is not DataModelStruct")
        }
        let result = Abc()
        result.name = String.deserialize(dms.get("name"))
        result.age = Int64.deserialize(dms.get("age"))
        result.loc = Option<Location>.deserialize(dms.get("loc"))
        return result
    }
}

四 序列化类的调用

4.1 onPageShow中调用

 protected override func onPageShow() {

     let dd = Abc()
     let aa: JsonValue = dd.serialize().toJson()
     let bb: JsonObject = (aa as JsonObject).getOrThrow()
     let v1 = (bb.get("name").getOrThrow() as JsonString).getOrThrow()
     let v2 = (bb.get("age").getOrThrow() as JsonInt).getOrThrow()
     let v3 = bb.get("loc").getOrThrow()
     Hilog.printInfo("printInfo",v1.getValue())
     Hilog.printInfo("printInfo",v2.getValue().toString())
     Hilog.printInfo("printInfo",v3.toString())
     Hilog.printInfo("printInfo","===========")
     let aaa = ##"{"age": 123, "loc": { "heheh": "H", "time": 45 }, "name": "zhangsan"}"##
     let bbb = JsonValue.fromStr(aaa)
     let ccc = (bbb as JsonObject).getOrThrow()
     let v4 = (ccc.get("name").getOrThrow() as JsonString).getOrThrow()
     let v5 = (ccc.get("age").getOrThrow() as JsonInt).getOrThrow()
     let v6 = (ccc.get("loc").getOrThrow() as JsonObject).getOrThrow()
     let v7 = (v6.get("time").getOrThrow() as JsonInt).getOrThrow()
     let v8 = (v6.get("heheh").getOrThrow() as JsonString).getOrThrow()
     Hilog.printInfo("printInfo",v4.getValue())
     Hilog.printInfo("printInfo",v5.getValue().toString())
     Hilog.printInfo("printInfo",v7.getValue().toString())
     Hilog.printInfo("printInfo",v8.getValue().toString())

 }
//Hilog扩展
extend Hilog{
   static func printInfo(tag: String, format: String){
      Hilog.info(1, tag,format)
    }
}

说明(类型)：

• 序列化类.serialize().toJson() ==> JsonValue
• (JsonValue as JsonObject).getOrThrow() ==> JsonObject(bb)
• bb.get("name") ==>Option<T>
• bb.get("name").getOrThrow() ==><T>
• (bb.get("name").getOrThrow() as JsonString) 强制转换为JsonString类型
• (bb.get("name").getOrThrow() as JsonString) .getOrThrow()==>JsonString
• (bb.get("name").getOrThrow() as JsonString) .getOrThrow().getValue()==>String
• aaa = ##"{"age": 123, "loc": { "heheh": "H", "time": 45 }, "name": "zhangsan"}"##
• JsonValue.fromStr(aaa)==>JsonValue

4.2 打印结果

Abcde
555
null
===========
zhangsan
123
45
H

五 参考

• HarmonyOS NEXT Developer Beta5仓颉—class序列化和反序列化