在Go中可以在一个zipfile对象中创建一个目录吗？

package main

import (
    "archive/zip"
    "fmt"
    "io"
    "os"
)

func createZipWithDirectory(zipfile string, directory string) error {
    file, err := os.Create(zipfile)
    if err != nil {
        return err
    }
    defer file.Close()

    zipWriter := zip.NewWriter(file)
    defer zipWriter.Close()

    // 创建一个新目录条目
    dirHeader := &zip.FileHeader{
        Name:   directory + "/",
        Method: zip.Deflate,
    }
    _, err = zipWriter.CreateHeader(dirHeader)
    if err != nil {
        return err
    }

    // 添加一个文件到目录中
    fileHeader := &zip.FileHeader{
        Name:   directory + "/example.txt",
        Method: zip.Deflate,
    }
    fileWriter, err := zipWriter.CreateHeader(fileHeader)
    if err != nil {
        return err
    }

    // 写入文件内容
    _, err = io.WriteString(fileWriter, "This is an example file.")
    if err != nil {
        return err
    }

    return nil
}

func main() {
    err := createZipWithDirectory("example.zip", "mydirectory")
    if err != nil {
        fmt.Println("Error:", err)
    } else {
        fmt.Println("Zip file created successfully.")
    }
}