go语言怎么修改文件

w := bufio.NewWriter(fw)

w.WriteString(result)

if err != nil {

    panic(err)

}

w.Flush()

func replace(w http.ResponseWriter, r *http.Request) {

    r.ParseForm()

    var arg1 string = r.FormValue("p1")//参数key

    ReadLine("index.html", arg1)

    fmt.Fprintf(w, "success") //返回结果

}

func main() {

    http.HandleFunc("/replace", replace)     //设置访问的路由

    err := http.ListenAndServe(":9090", nil) //设置监听的端口

    if err != nil {

        log.Fatal("ListenAndServe: ", err)

    }

}

go build