Golang将接口{}转换为struct

Golang将接口{}转换为struct

解组DTO之前，请将

Data

字段设置为所需的类型。

type Customer struct {    Name string `json:"name"`}type UniversalDTO struct {    Data interface{} `json:"data"`    // more fields with important meta-data about the message...}func main() {    // create a customer, add it to DTO object and marshal it    customer := Customer{Name: "Ben"}    dtoToSend := UniversalDTO{customer}    byteData, _ := json.Marshal(dtoToSend)    // unmarshal it (usually after receiving bytes from somewhere)    receivedCustomer := &Customer{}    receivedDTO := UniversalDTO{data: receivedCustomer}    json.Unmarshal(byteData, &receivedDTO)    //done    fmt.Println(receivedCustomer)}

如果您无法

Data

在解组前在DTO上初始化字段，则可以在解组后使用类型断言。

encoding/json

将

interface{}

类型值unamrshals
打包到中

map[string]interface{}

，因此您的代码将如下所示：

type Customer struct {    Name string `json:"name"`}type UniversalDTO struct {    Data interface{} `json:"data"`    // more fields with important meta-data about the message...}func main() {    // create a customer, add it to DTO object and marshal it    customer := Customer{Name: "Ben"}    dtoToSend := UniversalDTO{customer}    byteData, _ := json.Marshal(dtoToSend)    // unmarshal it (usually after receiving bytes from somewhere)    receivedDTO := UniversalDTO{}    json.Unmarshal(byteData, &receivedDTO)    //Attempt to unmarshall our customer    receivedCustomer := getCustomerFromDTO(receivedDTO.Data)    fmt.Println(receivedCustomer)}func getCustomerFromDTO(data interface{}) Customer {    m := data.(map[string]interface{})    customer := Customer{}    if name, ok := m["name"].(string); ok {        customer.Name = name    }    return customer}