英文:
String Interpolation / Templating Variables in Go lang
问题
假设我有以下字节字符串，表示一些 JSON 数据包：
data := []byte(`{"Id" : 1,"Name": "John Doe","Occupation": "gardener"}`)
我想知道，是否有一种动态创建这个 JSON 数据包的方法，例如：
var NAME = "John Doe"var OCCUPATION = "gardener"data := []byte(`{"Id" : 1,"Name": {{ NAME }},"Occupation": {{ OCCUPATION }}}`)
英文:
Let's say I have the following byte string which represents some JSON packet:
data := []byte(`{"Id" : 1,"Name": "John Doe","Occupation": "gardener"}`)
I'm wondering, is there a way to create this JSON packet dynamically, e.g.,
var NAME = "John Doe"var OCCUPATION = "gardener"data := []byte(`{"Id" : 1,"Name": {{ NAME }},"Occupation": {{ OCCUPATION }}}`)
答案1
得分: 3
你可以创建一个结构体并进行编组：
type Data struct {ID int `json:"Id"`Name string `json:"Name"`Occupation string `json:"Occupation"`}data := Data{ID: 1, Name: "name", Occupation: "Occupation"}byteData, err := json.Marshal(data)
这样做也会在必要时处理数据中的转义字符。
另一种方法：
data := map[string]interface{}{"Id": id,"Name": name,"Occupation": Occupation,}byteData, err := json.Marshal(data)
你也可以使用模板来实现，但是如果输入字符串包含需要转义的字符，有可能生成无效的 JSON 数据。
英文:
You can create a struct and marshal it:
type Data struct {ID int `json:"Id"`Name string `json:"Name"`Occupation string `json:"Occupation"`}data:=Data{ ID:1, Name: "name", Occupation: "Occupation" }byteData, err:=json.Marshal(data)
This will also take care of escaping characters in data when necessary.
Another way:
data:=map[string]interface{} {"Id": id,"Name": name,"Occupation": Occupation,}byteData, err:=json.Marshal(data)
You can also use templates for this, but then there is a chance you may generate invalid JSON data if the input strings contain characters that need to be escaped.
答案2
得分: 0
Go by Example网站上有一个关于使用encoding/json包的很好的页面：https://gobyexample.com/json
在你的特定情况下：
package mainimport ("encoding/json""log")type Person struct {ID int `json:"Id"`Name string `json:"Name"`Occupation string `json:"Occupation"`}func main() {p := Person{ID: 1, Name: "John Doe", Occupation: "gardener"}log.Printf("Person data: %+v\n", p)d, err := json.Marshal(p)if err != nil {log.Fatalf("failed to marshal json: %v", err)}log.Printf("Encoded JSON: %s\n", d)}
2022/09/05 16:02:54 Person data: {ID:1 Name:John Doe Occupation:gardener}2022/09/05 16:02:54 Encoded JSON: {"Id":1,"Name":"John Doe","Occupation":"gardener"}
英文:
Go by Example has a great page on using the encoding/json package: https://gobyexample.com/json
In your specific case:
package mainimport ("encoding/json""log")type Person struct {ID int `json:"Id"`Name string `json:"Name"`Occupation string `json:"Occupation"`}func main() {p := Person{ID: 1, Name: "John Doe", Occupation: "gardener"}log.Printf("Person data: %+v\n", p)d, err := json.Marshal(p)if err != nil {log.Fatalf("failed to marshal json: %v", err)}log.Printf("Encoded JSON: %s\n", d)}
2022/09/05 16:02:54 Person data: {ID:1 Name:John Doe Occupation:gardener}2022/09/05 16:02:54 Encoded JSON: {"Id":1,"Name":"John Doe","Occupation":"gardener"}
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