代码

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package main

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

func main() {
	http.Handle("/dir", http.StripPrefix("/dir", http.FileServer(http.Dir("/usr/local/"))))
	err := http.ListenAndServe(":8080", nil)
	//err := http.ListenAndServe(":8080",http.FileServer(http.Dir("/usr/local/")))
	if err != nil {
		log.Fatal("...")
	}
}

参考

  1. FileServer文档