map映射到结构体，这里只支持简单的数据类型，复杂的需要在拓展
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package main import ( "errors" "fmt" "reflect" "strconv" "time" ) type User struct { Name string Age int8 Date time.Time } func main() { data := make(map[string]interface{}) data["Name"] = "张三" data["Age"] = 26 data["Date"] = "2015-09-29 00:00:00" result := &User{} err := FillStruct(data, result) fmt.Println(err, fmt.Sprintf("%+v", *result)) } //用map填充结构 func FillStruct(data map[string]interface{}, obj interface{}) error { for k, v := range data { err := SetField(obj, k, v) if err != nil { return err } } return nil } //用map的值替换结构的值 func SetField(obj interface{}, name string, value interface{}) error { structValue := reflect.ValueOf(obj).Elem() //结构体属性值 structFieldValue := structValue.FieldByName(name) //结构体单个属性值 if !structFieldValue.IsValid() { return fmt.Errorf("No such field: %s in obj", name) } if !structFieldValue.CanSet() { return fmt.Errorf("Cannot set %s field value", name) } structFieldType := structFieldValue.Type() //结构体的类型 val := reflect.ValueOf(value) //map值的反射值 var err error if structFieldType != val.Type() { val, err = TypeConversion(fmt.Sprintf("%v", value), structFieldValue.Type().Name()) //类型转换 if err != nil { return err } } structFieldValue.Set(val) return nil } //类型转换 func TypeConversion(value string, ntype string) (reflect.Value, error) { if ntype == "string" { return reflect.ValueOf(value), nil } else if ntype == "time.Time" { t, err := time.ParseInLocation("2006-01-02 15:04:05", value, time.Local) return reflect.ValueOf(t), err } else if ntype == "Time" { t, err := time.ParseInLocation("2006-01-02 15:04:05", value, time.Local) return reflect.ValueOf(t), err } else if ntype == "int" { i, err := strconv.Atoi(value) return reflect.ValueOf(i), err } else if ntype == "int8" { i, err := strconv.ParseInt(value, 10, 64) return reflect.ValueOf(int8(i)), err } else if ntype == "int32" { i, err := strconv.ParseInt(value, 10, 64) return reflect.ValueOf(int64(i)), err } else if ntype == "int64" { i, err := strconv.ParseInt(value, 10, 64) return reflect.ValueOf(i), err } else if ntype == "float32" { i, err := strconv.ParseFloat(value, 64) return reflect.ValueOf(float32(i)), err } else if ntype == "float64" { i, err := strconv.ParseFloat(value, 64) return reflect.ValueOf(i), err } //else if .......增加其他一些类型的转换 return reflect.ValueOf(value), errors.New("未知的类型：" + ntype) } |
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时间： 2024-11-17 11:07:21