英文:
Is there a simpler way to implement a JSON REST service with net/http?
问题
我正在尝试使用net/http开发一个REST服务。
该服务接收一个包含所有输入参数的JSON结构。我想知道是否有一种更简单、更短的方法来实现以下代码：
func call(w http.ResponseWriter, r *http.Request) {
if err := r.ParseForm(); err != nil {
fmt.Printf("Error parsing request %s\n", err)
}
var buf []byte
buf = make([]byte, 256)
var n, err = r.Body.Read(buf)
var decoded map[string]interface{}
err = json.Unmarshal(buf[:n], &decoded)
if err != nil {
fmt.Printf("Error decoding json: %s\n", err)
}
var uid = decoded["uid"]
...
}
如你所见，为了提取第一个参数，需要相当多的代码行。有什么想法吗？
英文:
I am trying to develop a REST service with net/http.
The service receives a JSON structure containing all the input parameters. I wonder if there is an easier and shorter way to implement the following:
func call(w http.ResponseWriter, r *http.Request) {
if err := r.ParseForm(); err != nil {
fmt.Printf("Error parsing request %s\n", err)
}
var buf []byte
buf = make([]byte, 256)
var n, err = r.Body.Read(buf)
var decoded map[string]interface{}
err = json.Unmarshal(buf[:n], &decoded)
if err != nil {
fmt.Printf("Error decoding json: %s\n", err)
}
var uid = decoded["uid"]
...
}
As you can see it requires quite a number of lines just to get to the extraction of the first parameter. Any ideas?
答案1
得分: 6
你不需要调用r.ParseForm，如果请求的主体包含一个JSON结构，并且你不需要任何URL参数。
你也不需要缓冲区，可以使用：
decoder := json.NewDecoder(r.Body)
然后：
error := decoder.Decode(decoded)
将它们整合在一起：
func call(w http.ResponseWriter, r *http.Request) {
values := make(map[string]interface{})
if error := json.NewDecoder(r.Body).Decode(&values); error != nil {
panic(error)
}
uid := values["uid"].(int)
}
不过，如果你能正式定义你期望的输入结构的结构类型，会更好：
type UpdateUserInformationRequest struct {
UserId int `json:"uid"`
// 其他字段...
}
并且使用该结构的实例，而不是更通用的map。
英文:
You don't need to call r.ParseForm if the body of the request will contain a JSON structure and you don't need any URL parameters.
You don't need the buffer either; you can use:
decoder := json.NewDecoder(r.Body)
And then:
error := decoder.Decode(decoded)
Putting it all together:
func call(w http.ResponseWriter, r *http.Request) {
values := make(map[string]interface{})
if error := json.NewDecoder(r.Body).Decode(&values); error != nil {
panic(error)
}
uid := values["uid"].(int)
}
It would be much nicer, though, if you could formally define the structure of the input that you're expecting in a struct type:
type UpdateUserInformationRequest struct {
UserId int `json:"uid"`
// other fields...
}
And use an instance of this struct instead of a more general map.
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