文件上传如何获取http.Dir路径

package main

import (
    "log"
    "net/http"
)

func main() {
    // 指定文件上传目录
    uploadDir := http.Dir("/path/to/upload/directory")

    // 创建文件上传处理器
    http.HandleFunc("/upload", func(w http.ResponseWriter, r *http.Request) {
        if r.Method == "POST" {
            file, header, err := r.FormFile("file")
            if err != nil {
                http.Error(w, err.Error(), http.StatusInternalServerError)
                return
            }
            defer file.Close()

            // 创建目标文件
            dst, err := os.Create(uploadDir + "/" + header.Filename)
            if err != nil {
                http.Error(w, err.Error(), http.StatusInternalServerError)
                return
            }
            defer dst.Close()

            // 将上传的文件内容复制到目标文件
            if _, err := io.Copy(dst, file); err != nil {
                http.Error(w, err.Error(), http.StatusInternalServerError)
                return
            }

            w.Write([]byte("文件上传成功"))
        } else {
            w.WriteHeader(http.StatusMethodNotAllowed)
        }
    })

    log.Fatal(http.ListenAndServe(":8080", nil))
}