63_json解析成map格式

Posted 2022-12-27 zhaopp

package main

import (
   "encoding/json"
   "fmt"
)

func main() 
   //json文本
   JsonBuff := `
   
    "Name":"steven",
    "Subject":[
        "C++",
        "Go",
        "Python"
    ],
    "Isok":true,
    "Price":66.66
  
`
   m := make(map[string]interface, 4)
   err := json.Unmarshal([]byte(JsonBuff), &m)
   if err != nil 
      fmt.Println("err=", err)
      return
   
   fmt.Println(m)
   //map[Subject:[C++ Go Python] Isok:true Price:66.66 Name:steven]

   //如何提取map中的数据

   //
   // str = string(m["Name"])//无法转换
   // fmt.Println("str=", str)

   //使用类型断言,进行提取map里面的数据
   var str string
   for key, value := range m 
      switch data := value.(type)  //返回value 的值data

      case string:
         str = data
         fmt.Printf("map[%s]的值类型为string,value=%s\n", key, str)
      case bool:
         fmt.Printf("map[%s]的值类型为bool,value=%v\n", key, data)
      case float64:
         fmt.Printf("map[%s]float64,value=%f\n", key, data)
         //注意这是一个万能的类型不要忘了
      case []interface:
         fmt.Printf("map[%s]的值类型为slice,value=%v\n", key, data)