Go语言map与json串相互转化

1、Go语言map与json串相互转化

• map转为Json串(本质是string),先把map转为byte数组,再把byte数组转为Json串
• Json串(本质是string)转为map,先把Json串转为byte数组,再把byte数组转为map

package main

import (
   "encoding/json"
   "fmt"
)

func main() {
   //map转为json串(本质是string)
   //先把map转为byte数组
   //再把byte数组转为json串
   DataMap := map[string]int{"a": 1, "b": 2, "c": 3}
   marshal, err := json.Marshal(DataMap)
   if err != nil {
      fmt.Printf("Map转化为byte数组失败,异常:%s\n", err)
      return
   }
   fmt.Printf("Map转化为byte数组成功:%v\n", marshal)
   fmt.Printf("byte数组转化为Json串成功:%s\n", string(marshal))

   //json串(本质是string)转为map
   //先把json串转为byte数组
   //再把byte数组转为map
   dataStr := `{"a":1,"b":2,"c":3}`
   var dataMap map[string]int
   err = json.Unmarshal([]byte(dataStr), &dataMap)
   if err != nil {
      fmt.Printf("Json串转化为Map失败,异常:%s\n", err)
      return
   }
   fmt.Printf("Json串(本质是string)转化为Map成功:%v", dataMap)
}

2、结构体或者结构体数组转为Json串

package main

import (
   "encoding/json"
   "fmt"
)

type S struct {
   Name string `json:"name,omitempty"`
   Age  int    `json:"age,omitempty"`
   Sex  string `json:"sex,omitempty"`
}

func main() {
   s := S{
      Name: "小红",
      Age:  18,
      Sex:  "女",
   }
   marshal, err := json.Marshal(s)
   if err != nil {
      return
   }
   fmt.Println(string(marshal))

   sList := []S{{
      Name: "小红",
      Age:  18,
      Sex:  "女",
   }, {
      Name: "小李",
      Age:  20,
      Sex:  "男",
   }, {
      Name: "夏龙",
      Age:  18,
      Sex:  "女",
   }}
   marshal, err = json.Marshal(sList)
   if err != nil {
      return
   }
   fmt.Println(string(marshal))
}