英文:
How to extract specific JSON data
问题
我不知道如何选择特定的JSON数据。
您可以如何更改此代码，以便仅获取id，并且没有其他响应数据？
我在网上阅读了一些资料，显然我需要使用一个结构体？我不确定如何解决这个问题。
package main
import(
"fmt"
"io"
"log"
"net/http"
)
type Product struct {
ID string `json:"id"`
}
func get_single_product() {
res, err := http.Get("https://api.pro.coinbase.com/products/UNI-USD")
if err != nil {
log.Fatal(err)
}
data, err := io.ReadAll(res.Body)
res.Body.Close()
if err != nil {
log.Fatal(err)
}
product := Product{}
err = json.Unmarshal(data, &product)
if err != nil {
log.Fatal(err)
}
fmt.Printf("%s", product.ID)
}
func main() {
// 调用获取产品函数
get_single_product()
}
这将返回...
{
"id": "UNIUSD"
}
英文:
I do not know how to select specific JSON data.
How can I change this code so that I have just the id, and none of the other response data?
I read online, and apparently I need to use a struct? I am unsure of how to approach this problem.
package main
import(
"fmt"
"io"
"log"
"net/http"
)
func get_single_product() {
res, err := http.Get("https://api.pro.coinbase.com/products/UNI-USD")
if err != nil {
log.Fatal(err)
}
data, err := io.ReadAll(res.Body)
res.Body.Close()
if err != nil {
log.Fatal(err)
}
fmt.Printf("%s", data)
}
func main() {
// CALL GET PRODUCTS FUNCTION
get_single_product()
}
This Returns...
{
"id":"UNIUSD",
"base_currency":"UNI",
"quote_currency":"USD",
"base_min_size":"0.1",
"base_max_size":"200000",
"quote_increment":"0.0001",
"base_increment":"0.000001",
"display_name":"UNI/USD",
"min_market_funds":"1.0",
"max_market_funds":"100000",
"margin_enabled":false,
"post_only":false,
"limit_only":false,
"cancel_only":false,
"trading_disabled":false,
"status":"online",
"status_message":""
}
答案1
得分: 1
你可以使用encoding/json包将你的JSON数据解码为一个对象。只需在对象中定义你感兴趣的字段，它将只读取这些字段。然后使用json.NewDecoder()创建一个解码器。
package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
)
type Response struct {
ID string `json:"id"`
}
func main() {
res, err := http.Get("https://api.pro.coinbase.com/products/UNI-USD")
if err != nil {
log.Fatal(err)
}
var response Response
json.NewDecoder(res.Body).Decode(&response)
fmt.Println(response.ID)
}
// 输出
UNI-USD
参考这个问题：https://stackoverflow.com/questions/17156371/how-to-get-json-response-from-http-get
英文:
You can use the encoding/json package to decode your json data to an object. Just define the fields you are interested in the object and it will only read out those. Then create a decoder with json.NewDecoder().
package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
)
type Response struct {
ID string `json:"id"`
}
func main() {
res, err := http.Get("https://api.pro.coinbase.com/products/UNI-USD")
if err != nil {
log.Fatal(err)
}
var response Response
json.NewDecoder(res.Body).Decode(&response)
fmt.Println(response.ID)
}
// Output
UNI-USD
See also this question: https://stackoverflow.com/questions/17156371/how-to-get-json-response-from-http-get
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