golang结构体map和json相互转换

json转struct

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package main
 
import (
        "fmt"
        "encoding/json"
)
 
type People struct {
        Name string `json:"name_title"`
        Age int `json:"age_size"`
}
 
func main(){
        jsonStr := `
        {
                "name_title": "jqw"
                "age_size":12
        }
        `
        var people People
        json.Unmarshal([]byte(jsonStr), &people)
        fmt.Println(people)
}

struct转json

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package main
 
import (
        "fmt"
        "encoding/json"
)
 
type People struct {
        Name string `json:"name_title"`
        Age int `json:"age_size"`
}
 
func main(){
        p := People{
                Name: "jqw",
                Age: 18,
        }
 
        jsonBytes, err := json.Marshal(p)
        if err != nil {
                fmt.Println(err)
        }
        fmt.Println(string(jsonBytes))
}

json 转 map

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unc main(){
        jsonStr := `
        {
                "name": "jqw",
                "age": 18
        }
        `
        var mapResult map[string]interface{}
        err := json.Unmarshal([]byte(jsonStr), &mapResult)
        if err != nil {
                fmt.Println("JsonToMapDemo err: ", err)
        }
        fmt.Println(mapResult)
}

map 转 json

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func main(){
        mapInstances := []map[string]interface{}{}
        instance_1 := map[string]interface{}{"name": "John", "age": 10}
        instance_2 := map[string]interface{}{"name": "Alex", "age": 12}
        mapInstances = append(mapInstances, instance_1, instance_2)
 
        jsonStr, err := json.Marshal(mapInstances)
 
        if err != nil {
                fmt.Println("MapToJsonDemo err: ", err)
        }
        fmt.Println(string(jsonStr))
}

map 转struct

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func main(){
        mapInstance := make(map[string]interface{})
        mapInstance["Name"] = "jqw"
        mapInstance["Age"] = 18
 
        var people People
        err := mapstructure.Decode(mapInstance, &people)
        if err != nil {
                fmt.Println(err)
        }
        fmt.Println(people)
}

struct 转map

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func StructToMapDemo(obj interface{}) map[string]interface{}{
        obj1 := reflect.TypeOf(obj)
        obj2 := reflect.ValueOf(obj)
 
        var data = make(map[string]interface{})
        for i := 0; i < obj1.NumField(); i++ {
                data[obj1.Field(i).Name] = obj2.Field(i).Interface()
        }
        return data
}
func TestStructToMap(){
        student := Student{10, "jqw", 18}
        data := StructToMapDemo(student)
        fmt.Println(data)
}