GO语言的json输入（反序列化）之interfac{}存储

Posted 2021-01-11

// code_032_json_unmarshal_to_interface project main.go
package main

import (
    "encoding/json"
    "fmt"
)

func main() {
    b := []byte(`{
        "company":"tianmei",
        "subjects":[
            "Go",
            "C++",
            "Python",
            "Test"  
        ],
        "isok":true,
        "price":666.666
    }`)
    //备注：subjects:["Test",]后面没有元素了,还有逗号会报错的。

    var t interface{}
    err := json.Unmarshal(b, &t)
    if err != nil {
        fmt.Println("json err:", err)
    }
    fmt.Println(t)

    //使用断言判断类型
    m := t.(map[string]interface{})
    for k, v := range m {
        switch vv := v.(type) {
        case string:
            fmt.Println(k, "is string", vv)
        case int:
            fmt.Println(k, "is int", vv)
        case float64:
            fmt.Println(k, "is float64", vv)
        case bool:
            fmt.Println(k, "is bool", vv)
        case []interface{}: //slice类型的元素为interface{}接收
            fmt.Println(k, "is an array:")
            for i, u := range vv {
                fmt.Println(i, u)
            }
        default:
            fmt.Println(k, "is of a type I don‘t know to handle")
        }
    }
}