Go中的部分JSON解组成地图 [英] Partly JSON unmarshal into a map in Go
问题描述
每个json对象可能包含多个键/值对。
示例JSON:
{
sendMsg :{user:ANISUS,msg:尝试发送消息},
说:你好
}
使用encoding / json
包是否有任何简单的方法? p>
package main
import(
encoding / json
fmt
)
//sendMsg-command
的值的结构类型sendMsg struct {
用户字符串
msg string
}
//say-command
类型的值的类型表示字符串
func main(){
data:= [] byte (`{sendMsg:{user:ANISUS,msg:尝试发送消息},说:你好}`)
//这个将不会工作,因为json.MapObject([]字节)不存在
o bjmap,err:= json.MapObject(data)
//这是我希望objmap包含
// var objmap = map [string] [] byte {
//sendMsg:[] byte(`{user:ANISUS,msg:尝试发送消息}`),
//say:[] byte `你好`),
//}
fmt.Printf(%v,objmap)
}
感谢任何建议/帮助!
这可以是通过解组成一个 map [string] json.RawMessage
完成。
var objmap map [string] * json.RawMessage
err:= json.Unmarshal(data,& objmap)
要进一步解析 sendMsg
,您可以执行以下操作:
code> var s sendMsg
err = json.Unmarshal(* objmap [sendMsg],& s)
对于说
,你可以对字符串做同样的事情和解散:
var str string
err = json.Unmarshal(* objmap [say],& str)
My websocket server will receive and unmarshal JSON data. This data will always be wrapped in an object with key/value pairs. The key-string will act as value identifier, telling the Go server what kind of value it is. By knowing what type of value, I can then proceed to JSON unmarshal the value into the correct type of struct.
Each json-object might contain multiple key/value pairs.
Example JSON:
{
"sendMsg":{"user":"ANisus","msg":"Trying to send a message"},
"say":"Hello"
}
Is there any easy way using the "encoding/json"
package to do this?
package main
import (
"encoding/json"
"fmt"
)
// the struct for the value of a "sendMsg"-command
type sendMsg struct {
user string
msg string
}
// The type for the value of a "say"-command
type say string
func main(){
data := []byte(`{"sendMsg":{"user":"ANisus","msg":"Trying to send a message"},"say":"Hello"}`)
// This won't work because json.MapObject([]byte) doesn't exist
objmap, err := json.MapObject(data)
// This is what I wish the objmap to contain
//var objmap = map[string][]byte {
// "sendMsg": []byte(`{"user":"ANisus","msg":"Trying to send a message"}`),
// "say": []byte(`"hello"`),
//}
fmt.Printf("%v", objmap)
}
Thanks for any kind of suggestion/help!
This can be accomplished by Unmarshalling into a map[string]json.RawMessage
.
var objmap map[string]*json.RawMessage
err := json.Unmarshal(data, &objmap)
To further parse sendMsg
, you could then do something like:
var s sendMsg
err = json.Unmarshal(*objmap["sendMsg"], &s)
For say
, you can do the same thing and unmarshal into a string:
var str string
err = json.Unmarshal(*objmap["say"], &str)
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