6、json支持

package main

import (
   "encoding/json"
   "fmt"
)

// Json 支持

type Response1 struct{
   Page int

   Fruits []string
}

type Response2 struct{
   Page int `json:"page"`
   Fruits []string `json:"fruits"`
}

func main(){
   bolB,_:=json.Marshal(true)
   fmt.Println(string(bolB))

   intB,_:=json.Marshal(1)
   fmt.Println(string(intB))

   fltB,_:=json.Marshal(2.34)
   fmt.Println(string(fltB))

   strB,_:=json.Marshal("gopher")
   fmt.Println(string(strB))

   slcD:=[]string{"apple","peach","pear"}
   slcB,_:=json.Marshal(slcD)
   fmt.Println(string(slcB))

   //var map_vaiable  map[key_data_type]value_data_type
   mapD :=map[string] int{"apple":5,"lettuce":3}
   mapB,_:=json.Marshal(mapD)
   fmt.Println(string(mapB))

   res1D:=&Response1{
      Page:1,
      Fruits:[]string{"apple","peach","pear"},
   }

   res1B,_:=json.Marshal(res1D)
   fmt.Println(string(res1B))

   res2D :=Response2{
      Page:1,
      Fruits:[]string{"apple","peach","pear"},
   }
   res2B,_:=json.Marshal(res2D)
   fmt.Println(string(res2B))

   byt:=[]byte(`{"num":6.13,"strs":["a","b"]}`)

   var dat map[string]interface{}

   if err:=json.Unmarshal(byt,&dat);err!=nil{
      panic(err)
   }

   fmt.Println(dat)

   //转成合适类型
   num:=dat["num"].(float64)
   fmt.Println(num)

   strs :=dat["strs"].([]interface{})
   str1:=strs[0].(string)
   fmt.Println(str1)

}