[GO]json解析到map

package main

import (
    "encoding/json"
    "fmt"
)

var str string

func main() {
    m := make(map[string]interface{}, 4)
    jsonbuf := `{"company":"zyg","isok":true,"price":5.55,"subjects":["go","python","java"]}`
    err := json.Unmarshal([]byte(jsonbuf), &m)
    if err != nil {
        return
    }
    for key, value := range m{
        switch data := value.(type) {
        case string:
            str = data
            fmt.Printf("m[%s] value type is string, = %s\n", key, str)
        case float64:
            fmt.Printf("m[%s] value type is float64, = %f\n", key, data)
        case bool:
            fmt.Printf("m[%s] value type is bool, = %v\n", key, data)
        case []interface{}:
            fmt.Printf("m[%s] value type is []interface{}, = %v\n", key, data)
        }
    }
}

执行的结果为

m[isok] value type is bool, = true
m[price] value type is float64, = 5.550000
m[subjects] value type is []interface{}, = [go python java]
m[company] value type is string, = zyg

这里可以看到，将json解析到map与解析到结构各有各的好处，在声明上，结构体需要声明结构类型，而map只需要一个make函数，但是一旦得到了值以后，结构休的方式可以直接操作，map方式需要一个一个进行断言判断才行