go json null字段的转换

package main

import (
        "encoding/json"
        "fmt"
        "os"
)

var d = []byte(`{ "world":[{"data": 2251799813685312}, {"data": null}]}`)

type jsonobj struct{ World []World }
type World struct{ Data *int64 }

func main() {
        var data jsonobj
        jerr := json.Unmarshal(d, &data)
        fmt.Println(jerr)
        var t int64 = 111
        mardata := jsonobj{World: []World{World{Data: &t}, World{Data: nil}}}
        b, _ := json.Marshal(mardata)
        os.Stdout.Write(b)
}

package main

import "fmt"
import "encoding/json"

type jsons struct {
        Data1 *int64
        Data2 *int64
}

var d = []byte(`{"data1": 12121, "data2" : null}`)

func main() {
        var data jsons
        json.Unmarshal(d, &data)
        fmt.Println(*(data.Data1))
        if data.Data2 == nil {
                fmt.Println("data2 is nil")
        }
}