Golang 的 struct,map,json 互转

Golang 的 struct,map,json 互转

golangjsonmapstructjsonmapstructurereflect

公共代码区域

package mainimport (    "encoding/json"    "fmt"    "testing")type UserInfoVo struct {    Id   string `json:"id"`    UserName string `json:"user_name"`    Address []AddressVo `json:"address"`}type AddressVo struct {    Address string `json:"address"`}var beforeMap = map[string]interface{}{    "id":        "123",    "user_name": "酒窝猪",    "address":   []map[string]interface{}{{"address": "address01"}, {"address": "address02"}},}var User UserInfoVofunc init() {    User = UserInfoVo{        Id:       "01",        UserName: "酒窝猪",        Address: []AddressVo{            {                Address: "湖南",            },            {                Address: "北京",            },        },    }}

一、map, struct 互转1.map 转 struct

mapstructgithub.com/mitchellh/mapstructuremapjsonjsonstruct

第三方包 mapstructure

下载依赖，通过第三方依赖进行转换

go get github.com/goinggo/mapstructure

func TestMapToStructByMod(t *testing.T) {    var afterStruct =UserInfoVo{}    before := time.Now()    err := mapstructure.Decode(beforeMap, &afterStruct)    if err!=nil{        fmt.Println(err)    }    fmt.Printf("result:%+v \n",time.Since(before))    fmt.Printf("result:%+v \n",afterStruct)}

result:61.757µs result:{Id:123 UserName: Address:[{Address:address01} {Address:address02}]} --- PASS: TestMapToStructByMod (0.00s)PASS

通过 JSON 进行转换

mapJSONstruct

func TestMapToStructByJson(t *testing.T) {    beforeMap := map[string]interface {}{        "id":"123",        "user_name":"酒窝猪",        "address":[]map[string]interface{}{{"address": "address01"}, {"address": "address02"}},    }    var afterStruct =UserInfoVo{}    before := time.Now()    marshal, err := json.Marshal(beforeMap)    if err!=nil{        fmt.Println("marshal:",err)        return    }    err = json.Unmarshal(marshal, &afterStruct)    if err!=nil{        fmt.Println("unmarshal:",err)        return    }    fmt.Println(time.Since(before))    fmt.Printf("resutlt: %+v",afterStruct)}

134.299µsresutlt: {Id:123 UserName:酒窝猪 Address:[{Address:address01} {Address:address02}]}--- PASS: TestMapToStructByJson (0.00s)PASS

总结

问题：

论性能哪个更佳？

JSONmapstructure

2、struct 转 mapJSON 序列化转换

先将 struct 转换成字节数组，再将字节数组转换成 map 打印

func TestStructToMapByJson(t *testing.T) {    var resultMap interface{}    before := time.Now()    jsonMarshal, _ := json.Marshal(User)    err := json.Unmarshal(jsonMarshal, &resultMap)    if err != nil {        fmt.Println(err)        return    }    fmt.Println(time.Since(before))    fmt.Printf("%+v",resultMap)}

158.857µsmap[address:[map[address:湖南] map[address:北京]] id:01 user_name:酒窝猪]--- PASS: TestStructToMapByJson (0.00s)PASS

通过反射转换

通过反射获取 User 的类型与值

func TestStructToMapByReflect(t *testing.T) {    var resultMap = make(map[string]interface{},10)    before := time.Now()    ty:=reflect.TypeOf(User)    v:=reflect.ValueOf(User)    for i := 0; i < v.NumField(); i++ {        resultMap[strings.ToLower(ty.Field(i).Name)]=v.Field(i).Interface()    }    fmt.Println(time.Since(before))    fmt.Printf("%+v",resultMap)}

13.965µsmap[address:[{Address:湖南} {Address:北京}] id:01 username:酒窝猪]--- PASS: TestStructToMapByReflect (0.00s)PASS

总结

问题：论性能哪个更佳？

makestructs

二、struct, json 互转1. struct 转 json

func TestStructToJsonByJson(t *testing.T) {    before := time.Now()    marshal, _ := json.Marshal(User)    fmt.Println(time.Since(before))    fmt.Printf("%s", marshal)}

116.068µs{"id":"01","user_name":"酒窝猪","address":[{"address":"湖南"},{"address":"北京"}]}--- PASS: TestStructToJsonByJson (0.00s)PASS

2.json 转 struct

func TestJsonToStructByJson(t *testing.T) {    info:=UserInfoVo{}    marshal, _ := json.Marshal(User)    before := time.Now()    json.Unmarshal(marshal,&info)    fmt.Println(time.Since(before))    fmt.Printf("%+v",info)}

23.009µs{Id:01 UserName:酒窝猪 Address:[{Address:湖南} {Address:北京}]}--- PASS: TestJsonToStructByJson (0.00s)PASS

三、map, json 互转1.map 转 json

func TestMapToJson(t *testing.T) {    before := time.Now()    marshal, _ := json.Marshal(beforeMap)    fmt.Println(time.Since(before))    fmt.Printf("%s", marshal)}

75.133µs{"address":[{"address":"address01"},{"address":"address02"}],"id":"123","user_name":"酒窝猪"}--- PASS: TestMapToJson (0.00s)PASS

2.json 转 map

func TestJsonToMap(t *testing.T) {    marshal, _ := json.Marshal(beforeMap)    resultMap:=make(map[string]interface{},10)    before := time.Now()    json.Unmarshal(marshal,&resultMap)    fmt.Println(time.Since(before))    fmt.Printf("%+v", resultMap)}

28.728µsmap[address:[map[address:address01] map[address:address02]] id:123 user_name:酒窝猪]--- PASS: TestJsonToMap (0.00s)PASS

总结

jsonmapstructmapstructurestructmapjson