使用   encoding/json 包进行 json编码和解码

package main

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

type MyJson struct {
       Id int
       Name string
       Score float64
}

func Jsondecode(jsonStr string,v interface{}) (interface{},error) {
       err := json.Unmarshal([]byte(jsonStr),v)
       return v,err
}

func Jsonencode(obj interface{}) (string,error)  {
       bb,err := json.Marshal(&obj)
       if err != nil {
              return "",err
       }
       return string(bb),nil
}

func main(){
       jObj := map[string]interface{} {
              "id":1,
              "name":"张三",
              "score":5.3,
       }
       json1,_ := Jsonencode(jObj)
       //打印 {"id":1,"name":"张三","score":5.3}
       fmt.Println(json1)
       var p1  map[string]interface{}
       Jsondecode(json1,&p1)
       //打印 map[id:1 name:张三 score:5.3]
       fmt.Println(p1)

       jObj2 := MyJson{2,"lisi",6.3}
       json2,err := Jsonencode(jObj2)
       if err != nil {
              log.Println(err)
       }
       //打印 {"Id":2,"Name":"lisi","Score":6.3}
       fmt.Println(json2)
       p2 := new(MyJson)
       Jsondecode(json2,p2)
       //打印 {2 lisi 6.3}
       fmt.Println(*p2)
}