英文:
Trouble unmarshaling text into struct
问题
尝试将一个 JSON 文本解组为自定义的结构体。我的结构体定义似乎是正确的，但 json.Unmarshal 没有返回任何内容。
package main
import (
"encoding/json"
"fmt"
)
type CmdUnit struct {
Command string
Description string
}
type CmdList struct {
ListOfCommands []CmdUnit
}
type OneCmdList struct {
Area string
CmdList CmdList
}
type AllCommands struct {
AllAreas []OneCmdList
}
func main() {
jsonTxt := `
{
"Area1": [{
"Command": "cmd1",
"Desc": "cmd1 desc"
}, {
"Command": "cmd2",
"Desc": "cmd2 desc"
}],
"Area2": [{
"Command": "cmd1",
"Desc": "cmd1 desc"
}]
}
`
cmds := AllCommands{}
if err := json.Unmarshal([]byte(jsonTxt), &cmds); err != nil {
fmt.Println("Failed to unmarshal:", err)
} else {
fmt.Printf("%+v\n", cmds)
}
}
$ go run j.go
{AllAreas:[]}
以上是你要翻译的内容。
英文:
Trying to unmarshal a json text into my own struct. My struct definitions seem correct but json.Unmarshal doesn't return anything.
package main
import (
"encoding/json"
"fmt"
)
type CmdUnit struct {
Command string
Description string
}
type CmdList struct {
ListOfCommands []CmdUnit
}
type OneCmdList struct {
Area string
CmdList CmdList
}
type AllCommands struct {
AllAreas []OneCmdList
}
func main() {
jsonTxt := `
{
"Area1": [{
"Command": "cmd1",
"Desc": "cmd1 desc"
}, {
"Command": "cmd2",
"Desc": "cmd2 desc"
}],
"Area2": [{
"Command": "cmd1",
"Desc": "cmd1 desc"
}]
}
`
cmds := AllCommands{}
if err := json.Unmarshal([]byte(jsonTxt), &cmds); err != nil {
fmt.Println("Failed to unmarshal:", err)
} else {
fmt.Printf("%+v\n", cmds)
}
}
$ go run j.go
{AllAreas:[]}
答案1
得分: 3
你的结构体与你提供的 JSON 有不同的结构。在你的示例中，将结构体编组将导致以下 JSON 结构：
{
"AllAreas": [
{
"Area": "Area1",
"CmdList": {
"ListOfCommands": [
{
"Command": "cmd1",
"Description": "cmd1 desc"
},
{
"Command": "cmd2",
"Description": "cmd2 desc"
}
]
}
}
]
}
在你的示例中，可以直接将 JSON 反编组为 map[string][]CmdUnit{}，只需将 CmdUnit.Description 更改为 CmdUnit.Desc。
cmds := map[string][]CmdUnit{}
if err := json.Unmarshal(jsonTxt, &cmds); err != nil {
log.Fatal("Failed to unmarshal:", err)
}
fmt.Printf("%+v\n", cmds)
链接：https://play.golang.org/p/DFLYAfNLES
英文:
Your structs have a different structure from the json you're providing. Marshalling the structs in your example would result in json that looks like:
{
"AllAreas": [
{
"Area": "Area1",
"CmdList": {
"ListOfCommands": [
{
"Command": "cmd1",
"Description": "cmd1 desc"
},
{
"Command": "cmd2",
"Description": "cmd2 desc"
}
]
}
}
]
}
The json in your example can be unmarshaled directly into a map[string][]CmdUnit{} with the minor change of CmdUnit.Description to CmdUnit.Desc.
cmds := map[string][]CmdUnit{}
if err := json.Unmarshal(jsonTxt, &cmds); err != nil {
log.Fatal("Failed to unmarshal:", err)
}
fmt.Printf("%+v\n", cmds)
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论