英文:
Convert a nested struct to nested json dynamically golang
问题
你可以使用encoding/json包来将嵌套的结构体转换为嵌套的JSON。首先，你需要为每个结构体定义JSON字段的标签，然后使用json.Marshal()函数将结构体转换为JSON字符串。
以下是你提供的示例结构体的修改版本，添加了JSON字段标签：
type Details struct {
Name string `json:"name"`
Age int `json:"age"`
Address *Address `json:"address"`
DateOfBirth *Date `json:"dateOfBirth"`
}
type Address struct {
Street string `json:"street"`
City string `json:"city"`
State string `json:"state"`
Country string `json:"country"`
}
type Date struct {
Day int `json:"day"`
Month string `json:"month"`
Year int `json:"year"`
}
type StudentDetails struct {
Details *Details `json:"details"`
}
然后，你可以使用json.Marshal()函数将结构体转换为JSON字符串：
details := &Details{
Name: "aaa",
Age: 20,
Address: &Address{
Street: "",
City: "",
State: "",
Country: "",
},
DateOfBirth: &Date{
Day: 1,
Month: "Jan",
Year: 2000,
},
}
jsonData, err := json.Marshal(details)
if err != nil {
// 错误处理
}
fmt.Println(string(jsonData))
输出将是以下JSON字符串：
{
"name": "aaa",
"age": 20,
"address": {
"street": "",
"city": "",
"state": "",
"country": ""
},
"dateOfBirth": {
"day": 1,
"month": "Jan",
"year": 2000
}
}
你可以根据需要动态地构建结构体，并使用json.Marshal()将其转换为JSON字符串。
英文:
how do i convert the following nested struct
type Details struct {
name string
age int
address *address
dateOfBirth *date
}
type address struct {
street string
city string
state string
country string
}
type date struct {
day int
month string
year int
}
type StudentDetails struct {
details *PersonalDetails
}
to a nested json of any level in golang, something like this
{
"Student_1":{
"name":"aaa",
"age":20,
"address":[{
"street":"",
"city":"",
"state":"",
"country":""
},{
"street":"",
"city":"",
"state":"",
"country":""
}],
"date":{
"day":1,
"month":"Jan",
"year":2000
}
},
"Student_2":{
"name":"bbb",
"age":22,
"address":[{
"street":"",
"city":"",
"state":"",
"country":""
},{
"street":"",
"city":"",
"state":"",
"country":""
}],
"date":{
"day":1,
"month":"Feb",
"year":2002
}
}
}
i want to build a json dynamically based on what is in this struct. The struct is build from protocol buffer. The pointer points to the struct it needs to fetch the details from. I used to reflect package to access the struct, i'm able to read through the data but not able to build the same. Any help is appreciated
答案1
得分: 1
你应该构建对象，然后使用json.Marshal(obj)。
解决方案可能如下所示：
package main
import (
"encoding/json"
"fmt"
)
type User struct {
Name string
Age int
Active bool
lastLoginAt string
Address *address
}
type address struct {
City string
Street string
}
func main() {
u, err := json.Marshal(User{Name: "Bob", Age: 10, Active: true, lastLoginAt: "today", Address: &address{City: "London", Street: "some str."}})
if err != nil {
panic(err)
}
fmt.Println(string(u))
}
输出结果为：
{"Name":"Bob","Age":10,"Active":true,"Address":{"City":"London","Street":"some str."}}
英文:
You should construct the object and then use json.Marshal(obj)
The solution may be something like:
package main
import (
"encoding/json"
"fmt"
)
type User struct {
Name string
Age int
Active bool
lastLoginAt string
Address *address
}
type address struct {
City string
Street string
}
func main() {
u, err := json.Marshal(User{Name: "Bob", Age: 10, Active: true, lastLoginAt: "today", Address: &address{City: "London", Street: "some str."}})
if err != nil {
panic(err)
}
fmt.Println(string(u))
}
The output is:
{"Name":"Bob","Age":10,"Active":true,"Address":{"City":"London","Street":"some str."}}
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