英文:
How do I iterate over a JSON array in Golang?
问题
我正在尝试解码一个JSON数组并将其放入一个结构体切片中。我已经了解了如何做到这一点，但前提是JSON数组包含键。而我的JSON数组没有包含键。
我已经将程序简化为仅处理JSON数据的部分。它可以编译，并且可以在下面找到。
package main
// 2014-04-19
import (
"fmt"
"encoding/json"
)
type itemdata struct {
data1 int // 我尝试将这些字段改为字符串类型
data2 int
data3 int
}
func main() {
datas := []itemdata{}
json.Unmarshal([]byte(`[["7293","1434","99646"],["4657","1051","23795"]]`), &datas)
// 我尝试过不在数字周围加引号的JSON字符串
fmt.Println(len(datas)) // 这将打印'2'
fmt.Println("This prints") // 这将打印
for i := range datas {
fmt.Println(datas[i].data1) // 这将打印'0'，两次
}
fmt.Println("And so does this") // 这将打印
}
我搜索了类似"Go语言无键JSON解码"的内容，并阅读了Go语言网站上的文章和包页面。我可以找到足够的关于如何处理Go和JSON的信息，但是我找到的文章都没有解释如何在JSON数组中没有键的情况下处理它。
如果我得到一个错误，我不会感到奇怪；JSON的值是字符串形式的数字（这是我输入的方式），但我试图将它们放入整数中。然而，我没有得到错误。我尝试将itemdata结构体中的值改为字符串，但效果不大。删除JSON值中的引号也没有帮助。
我想知道如何将我的JSON数组转换为itemdata的切片。前三个值将分别放入itemdata.data1、itemdata.data2和itemdata.data3中。
如果您认为我可以改进我的问题，请告诉我。
提前感谢，
Remi
英文:
I am trying to decode a JSON array and put it in a slice of a struct. I've read how to do this, but only if the JSON array contains keys. My JSON array does not contain keys.
I have stripped the program down to only the part where it handles the JSON data. It compiles and can be found below.
package main
// 2014-04-19
import (
"fmt"
"encoding/json"
)
type itemdata struct {
data1 int // I have tried making these strings
data2 int
data3 int
}
func main() {
datas := []itemdata{}
json.Unmarshal([]byte(`[["7293","1434","99646"],["4657","1051","23795"]]`), &datas)
// I have tried the JSON string without the qoutes around the numbers
fmt.Println(len(datas)) // This prints '2'
fmt.Println("This prints") // This does print
for i := range datas {
fmt.Println(datas[i].data1) // This prints '0', two times
}
fmt.Println("And so does this") // This does print
}
I've searched for things like 'Go Lang JSON decode without keys' and read articles (and 'package pages') on the Go Lang website. I can find enough information on how to work with Go and JSON, but none of my found articles explain how to do it without keys in the JSON array.
I wouldn't find it odd if I would get an error; The JSON values are stringy-numbers (that's how I get them as input), but I am trying to put them in integers. I am not getting an error though. I have tried making the values in the 'itemdata' struct strings, that didn't help much. Removing the quotes from the JSON values didn't help either.
I would like to know how I can make my JSON array in a slice of 'itemdata'. The first out of three values would go into 'itemdata.data1', the second in 'itemdata.data2' and the third in 'itemdata.data3'.
Please let me know if you think I can improve my question.
Thanks in advance,
Remi
答案1
得分: 9
你这里有一个二维字符串数组。你可以像这样解码它：
type itemdata [][]string
func main() {
var datas itemdata
json.Unmarshal([]byte(`[["7293","1434","99646"],["4657","1051","23795"]]`), &datas)
fmt.Println(len(datas))
fmt.Println("This prints")
for i := range datas {
fmt.Println(datas[i][1])
}
fmt.Println("And so does this")
}
英文:
What you have here is a bi-dimensional array of strings. You can decode it like this :
type itemdata [][]string
func main() {
var datas itemdata
json.Unmarshal([]byte(`[["7293","1434","99646"],["4657","1051","23795"]]`), &datas)
fmt.Println(len(datas))
fmt.Println("This prints")
for i := range datas {
fmt.Println(datas[i][1])
}
fmt.Println("And so does this")
}
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