将 JSON 结构附加到 JSON 文件 Golang

Question

我有一个用户的 JSON 文档，其中有 ID#、电话#和电子邮件。在输入另一个 ID、电话和电子邮件时，我想获取新用户的信息并将其附加到文件中。我有一个只包含 {ID: #, Phone: #, Email: #} 的结构，并且工作正常。但是我的 JSON 文件变成了这样：

[{"ID":"ABCD","Phone":1234567890,"Email":"johndoe@test.com"}]
[{"ID":"EFGH","Phone":1234567890,"Email":"johndoe@test.com"}]
[{"ID":"IJKL","Phone":1234567890,"Email":"johndoe@test.com"}]
[{"ID":"MNOP","Phone":1234567890,"Email":"johndoe@test.com"}]
[{"ID":"QRST","Phone":1234567890,"Email":"johndoe@test.com"}]
[{"ID":"UVWX","Phone":1234567890,"Email":"johndoe@test.com"}]

所以我可以附加到文档中，但它是一个用方括号 [] 括起来的新 JSON 结构。下面是我的代码。我省略了实际的散列 ID。

func ToIds(e string, p int64) {
    hashed := GenId()
    var jsonText = []byte(`[
        {"ID": "", "Phone": 0, "Email": ""}
    ]`)
    var I Identification
    err := json.Unmarshal([]byte(jsonText), &I)
    if err != nil {
        fmt.Println(err)
    }
    I[0].ID = hashed
    I[0].Phone = p
    I[0].Email = e

    result, error := json.Marshal(I)
    if error != nil {
        fmt.Println(error)
    }

    f, erro := os.OpenFile("FILE_PATH", os.O_APPEND|os.O_WRONLY, 0666)
    if erro != nil {
        fmt.Println(erro)
    }

    n, err := io.WriteString(f, string(result))
    if err != nil {
        fmt.Println(n, err)
    }

}

这可能有用，这是我的识别结构。

type Identification []struct { ID string Phone int64
Email string }

本质上，我想要外面的括号，在这些括号内我想附加多个用户。像这样的东西：

    [
    {"id":"A", "phone":17145555555, "email":"tom@gmail.com"},
    {"id":"B","phone":15555555555,"email":"p@gmail.com"},
    {"id":"C","phone":14155555555,"email":"bradley@gmail.com"},
    {"id":"D","phone":17135555555,"email":"g@gmail.com"},
    {"id":"E","phone":17125555555,"email":"ann@gmail.com"},
    {"id":"F","phone":17125555555,"email":"sam@gmail.com"},
    {"id":"G","phone":14055555555,"email":"john@gmail.com"},
    {"id":"H","phone":13105555555,"email":"lisa@gmail.com"}
    ]

Answer 1

要实现您的输出，请按如下方式定义 struct-

type Identification struct {
   ID    string
   Phone int64
   Email string
}

并执行如下操作-

// define slice of Identification
var idents []Identification

// Unmarshall it
err := json.Unmarshal([]byte(jsonText), &idents)

// add further value into it
idents = append(idents, Identification{ID: "ID", Phone: 15555555555, Email: "Email"})

// now Marshal it
result, error := json.Marshal(idents)

// now result has your targeted JSON structure

以上解释的示例程序https://play.golang.org/p/67dqOaCWHI