[英]How to Unmarshal the json array?
There is something wrong when I unmarshal the json array. 当我解组json数组时出了点问题。
How do I correct it ? 我该如何纠正? the code is: http://play.golang.org/p/AtU9q8Hlye 该代码是: http : //play.golang.org/p/AtU9q8Hlye
package main
import (
"encoding/json"
"fmt"
)
type Server struct {
ServerName string
ServerIP string
}
type Serverslice struct {
Name string
Servers []Server
}
func main() {
var s []Serverslice
str := `{"name":"dxh","servers":[{"serverName":"VPN0","serverIP":"127.0.0.1"},{"serverName":"Beijing_VPN","serverIP":"127.0.0.2"}],
"name":"dxh1,"servers":[{"serverName":"VPN1","serverIP":"127.0.0.1"},{"serverName":"Beijing_VPN","serverIP":"127.0.0.2"}]}`
json.Unmarshal([]byte(str), &s) //the wrong line.....................
fmt.Println(len(s))
}
First of all, you're ignoring the error return value from json.Unmarshal
. 首先,您将忽略json.Unmarshal
的错误返回值。 You probably want something like: 您可能想要类似:
if err := json.Unmarshal([]byte(str), &s); err != nil {
log.Fatalln(err)
}
With that change, we can see that your JSON data isn't valid: invalid character 's' after object key:value pair
. 进行此更改后,我们可以看到您的JSON数据无效: invalid character 's' after object key:value pair
。 There is a missing quote at the end of "dxh1
on the second line. 在第二行"dxh1
的末尾缺少引号。
Fixing that error and rerunning the program you'll get a different error: json: cannot unmarshal object into Go value of type []main.Serverslice
. 修复该错误并重新运行程序,您将收到另一个错误: json: cannot unmarshal object into Go value of type []main.Serverslice
。 There are two possible problems here: 这里有两个可能的问题:
You meant to decode into an object. 您打算解码成一个对象。 In this case, just declare s
as a Serverslice
. 在这种情况下,只需将s
声明为Serverslice
。 Here is a version of your program that makes that change: http://play.golang.org/p/zgyr_vnn-_ 这是可以进行更改的程序版本: http : //play.golang.org/p/zgyr_vnn-_
Your JSON is supposed to be an array (possible, since it seems to have duplicate keys). 您的JSON应该是一个数组(可能,因为它似乎有重复的键)。 Here's an updated version with the JSON changed to provide an array: http://play.golang.org/p/Wl6kUaivEm 这是JSON更改为提供数组的更新版本: http : //play.golang.org/p/Wl6kUaivEm
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