如何在golang中使用Unmarshal从json docs获取结构中的json字符串

Question

示例代码

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我想要json字符串类型的Address变量（如package main import ( "encoding/json" "fmt" ) type ClassRoom struct { Student struct { Name string /* Address struct { City string Zip int } `json:"address"` */ Address []string `json:"address"` //here, Want to get json string Age int `json:"age"` } `json:"student"` ClassCode int `json:"code"` } func main() { jsonDocs := `[ {"student":{"name":"jss","address":{"City":"Seoul","Zip":54},"Age":28},"ClassCode":1234}]` var node []ClassRoom json.Unmarshal([]byte(jsonDocs), &node) fmt.Println(node) } ）。

Answer 1

您需要使用json.RawMessage代替[]string，例如：

type ClassRoom struct {
    Student struct {
        Name string
        Address json.RawMessage `json:"address"` //here, Want to get json string
        Age     int             `json:"age"`
    } `json:"student"`
    ClassCode int `json:"code"`
}

func main() {
    jsonDocs := `[{"student":{"name":"jss","address":{"City":"Seoul","Zip":54},"Age":28},"ClassCode":1234}]`
    var node []ClassRoom

    json.Unmarshal([]byte(jsonDocs), &node)
    fmt.Printf("%s\n", node[0].Student.Address)

    var addr struct {
        City string
        Zip  int
    }
    json.Unmarshal(node[0].Student.Address, &addr)
    fmt.Printf("%+v", addr)
}

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