Golang中http.HandleFunc内部的异步文件写入

package main

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

func main() {
    http.HandleFunc("/write", writeFileHandler)
    http.ListenAndServe(":8080", nil)
}

func writeFileHandler(w http.ResponseWriter, r *http.Request) {
    // 异步执行文件写入操作
    go func() {
        // 创建或打开文件
        file, err := os.OpenFile("data.txt", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
        if err != nil {
            fmt.Println("Failed to open file:", err)
            return
        }
        defer file.Close()

        // 要写入的数据
        data := "Hello, World!"

        // 写入文件
        _, err = file.WriteString(data)
        if err != nil {
            fmt.Println("Failed to write to file:", err)
            return
        }

        fmt.Println("Data written to file:", data)
    }()

    fmt.Fprint(w, "File write request received")
}