我在取消編組嵌套的 json 數組時遇到問題。示例如下：{ "Subnets": [ { "AvailabilityZone": "xx", "AvailabilityZoneId": "xx", "AvailableIpAddressCount": 173, "CidrBlock": "xx", "DefaultForAz": "xx", "MapPublicIpOnLaunch": "xx", "MapCustomerOwnedIpOnLaunch": "xx", "State": "xx", "SubnetId": "xx", "VpcId": "xx", "OwnerId": "xx", "AssignIpv6AddressOnCreation": "xx", "Ipv6CidrBlockAssociationSet": [], "Tags": [ { "Key": "Name", "Value": "xx" }, { "Key": "workload", "Value": "xx" }, { "Key": "xx", "Value": "xx" }, { "Key": "aws:cloudformation:stack-name", "Value": "xx" }, { "Key": "host_support_group", "Value": "xx" }, { "Key": "environment", "Value": "xx" }, { "Key": "client", "Value": "xx" }, { "Key": "aws:cloudformation:stack-id", "Value": "xx" }, { "Key": "application", "Value": "Subnet" }, { "Key": "xx", "Value": "xx" }, { "Key": "xx", "Value": "xx" }, { "Key": "xx", "Value": "xx" }, { "Key": "regions", "Value": "ca-central-1" } ], "SubnetArn": "xx" }] , "ResponseMetadata": { "RequestId": "xx", "HTTPStatusCode": 200, "HTTPHeaders": { "x-amzn-requestid": "xx", "cache-control": "no-cache, no-store", "strict-transport-security": "max-age=31536000; includeSubDomains", "content-type": "text/xml;charset=UTF-8", "content-length": "3176", "vary": "accept-encoding", "date": "xx", "server": "AmazonEC2" }, "RetryAttempts": 0 }}
2 回答
炎炎設計
TA貢獻1808條經驗 獲得超4個贊
您可以使用所需字段創建一個結構，并使用該結構取消封送 JSON 字節，該結構將填充結構中提到的字段。
type Something struct {
AvailableIpAddressCount int `json:"AvailableIpAddressCount"`
}
var data Something
if err := json.unmarshal(byt, &data); err != nil {
panic(err)
}
AvailableIpAddressCount = data.AvailableIpAddressCount
慕萊塢森
TA貢獻1810條經驗 獲得超4個贊
Go 使用靜態結構來解碼 json，因此您可能需要創建一個至少包含您要查找的內容的結構。如果您有您的結構，則可以像這樣訪問可用IP地址計數：
tmp.Subnets[0].AvailableIPAddressCount
這是游樂場 https://play.golang.org/p/FsjeOubov1Q。
要從示例 json 創建 json 結構，可以使用此類工具。
如果需要遍歷所有子網：
for _, subnet := range tmp.Subnets {
fmt.Println(subnet.AvailableIPAddressCount)
}如果要動態使用 json，也可以使用 https://github.com/spf13/viper。但它可能比靜態解碼慢。
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