用Golang函数简化文件上传处理

package main

import (
    "net/http"
    "io"
    "fmt"
)

func main() {
    http.HandleFunc("/upload", func(w http.ResponseWriter, r *http.Request) {
        // 检查请求方法是否为 POST
        if r.Method != "POST" {
            http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
            return
        }

        // 从请求中获取文件
        file, _, err := r.FormFile("file")
        if err != nil {
            http.Error(w, "Cannot get file", http.StatusBadRequest)
            return
        }

        // 打开文件进行保存
        dst, err := os.Create("./uploaded.txt")
        if err != nil {
            http.Error(w, "Cannot save file", http.StatusInternalServerError)
            return
        }

        // 复制文件内容到保存的文件中
        if _, err := io.Copy(dst, file); err != nil {
            http.Error(w, "Cannot copy file", http.StatusInternalServerError)
            return
        }

        fmt.Fprintf(w, "File saved successfully")
    })

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