由于想给一个结构体的部分成员赋值，但是有不知道具体名字，故将tag的json名字作为索引，按照json名字来一一赋值
1.通过tag反射
//将结构体里的成员按照json名字来赋值
func SetStructFieldByJsonName(ptr interface{}, fields map[string]interface{}) {
logger.Debug("fields:", fields) v := reflect.ValueOf(ptr).Elem() // the struct variable for i := ; i < v.NumField(); i++ { fieldInfo := v.Type().Field(i) // a reflect.StructField
tag := fieldInfo.Tag // a reflect.StructTag
name := tag.Get("json") if name == "" {
name = strings.ToLower(fieldInfo.Name)
}
//去掉逗号后面内容 如 `json:"voucher_usage,omitempty"`
name = strings.Split(name, ",")[]
logger.Debug("JSONnAME:", name) if value, ok := fields[name]; ok { logger.Debug("fieldInfo.Name:", fieldInfo.Name)
//给结构体赋值
//保证赋值时数据类型一致
logger.Debug("类型1：", reflect.ValueOf(value).Type(), "类型2：", v.FieldByName(fieldInfo.Name).Type())
if reflect.ValueOf(value).Type() == v.FieldByName(fieldInfo.Name).Type() {
v.FieldByName(fieldInfo.Name).Set(reflect.ValueOf(value))
} }
} return
}
2.通过结构体字段名称进行反射
// 通过反射，对user进行赋值
type user struct{
name string
age int
feature map[string]interface{}
} func main() {
var u interface{}
u=new(user)
value:=reflect.ValueOf(u)
if value.Kind()==reflect.Ptr{
elem:=value.Elem()
name:=elem.FieldByName("name")
if name.Kind()==reflect.String{
*(*string)(unsafe.Pointer(name.Addr().Pointer())) = "fangwendong"
} age:=elem.FieldByName("age")
if age.Kind()==reflect.Int{
*(*int)(unsafe.Pointer(age.Addr().Pointer())) =24
} feature:=elem.FieldByName("feature")
if feature.Kind()==reflect.Map{
*(*map[string]interface{})(unsafe.Pointer(feature.Addr().Pointer())) =map[string]interface{}{
"爱好":"篮球",
"体重":60,
"视力":5.2,
}
} } fmt.Println(u)
}