json - 如何从JSON解析值。我正在尝试列出单个值，例如python中的字典

Question

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    resp, err := http.Get("https://s3.us-west-2.amazonaws.com/cloudformation-templates-us-west-2/AutoScalingMultiAZWithNotifications.template")

    if err !=nil {
        fmt.Println(err)

    }

    body, err := ioutil.ReadAll(resp.Body)

    if err != nil {
        fmt.Println(err)
    }

    v := make(map[string] interface{})

    json.Unmarshal(body, &v)

    fmt.Println(v)
}

Answer 1

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    resp, err := http.Get("https://s3.us-west-2.amazonaws.com/cloudformation-templates-us-west-2/AutoScalingMultiAZWithNotifications.template")
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    v := make(map[string]interface{})
    if err := json.NewDecoder(resp.Body).Decode(&v); err != nil {
        panic(err)
    }

    // index into map v and type-assert the value
    if Parameters, ok := v["Parameters"].(map[string]interface{}); ok {
        // index into Parameters and if found, print
        if VpcId, ok := Parameters["VpcId"]; ok {
            fmt.Println(VpcId)
        }
    }

}