Go中Json、Map、Struct互转

这个本来想放到snippet里面的，不过还是有点代码 所以单独放出来吧

package main

import (
    "encoding/json"
    "fmt"
    "github.com/goinggo/mapstructure"
    "reflect"
)

// json map struct 互转
type Person struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}

func main() {
    //Json
    jsonStr := `{"name":"zhangsan","age":12}` // json字符串大小写不敏感
    // Json To Struct
    var person Person
    json.Unmarshal([]byte(jsonStr), &person)
    fmt.Println(person) //{zhangsan 12}
    //Json To Map
    var mapResult map[string]interface{}
    json.Unmarshal([]byte(jsonStr), &mapResult)
    fmt.Println(mapResult) //map[age:12 name:zhangsan]

    //Struct
    p := Person{"ZhangSan", 30}
    // Struct To Json
    jsonBytes, _ := json.Marshal(p)
    fmt.Printf(string(jsonBytes)) //{"name":"ZhangSan","age":30}
    //Struct To Map 或者引用三方类库
    fmt.Println(StructToMap(p))

    //Map
    m := make(map[string]interface{})
    m["Name"] = "WangWu"
    m["Age"] = 20
    //Map To Json
    jsonStr2, _ := json.Marshal(m)
    fmt.Println(string(jsonStr2)) //{"Age":20,"Name":"WangWu"}
    //Map To Struct 这个一般使用三方类库
    var p2 Person
    mapstructure.Decode(m, &p2)
    fmt.Println(p2) //{WangWu 20}
}

func StructToMap(obj interface{}) map[string]interface{} {
    t := reflect.TypeOf(obj)
    v := reflect.ValueOf(obj)
    var data = make(map[string]interface{})
    for i := 0; i < t.NumField(); i++ {
        data[t.Field(i).Name] = v.Field(i).Interface()
    }
    return data
}