安装

go get -u github.com/gobuffalo/packr/packr
go get -u github.com/gobuffalo/packr

当前目录：

[root@localhost d0116]# tree
.
├── go.mod
├── go.sum
├── static
│   ├── index2.html
│   ├── index.html
│   └── js
│       └── example.js
└── x.go

执行packr

[root@localhost d0116]# packr
[root@localhost d0116]# tree
.
├── a_main-packr.go
├── go.mod
├── go.sum
├── static
│   ├── index2.html
│   ├── index.html
│   └── js
│       └── example.js
└── x.go

2 directories, 7 files

build构建

[root@localhost d0116]# go build x.go a_main-packr.go 
[root@localhost d0116]# tree
.
├── a_main-packr.go
├── go.mod
├── go.sum
├── static
│   ├── index2.html
│   ├── index.html
│   └── js
│       └── example.js
├── x
└── x.go

2 directories, 8 files

之后可执行文件x在任何位置都可以执行，不依赖于静态资源。
测试如下：

[root@localhost ~]# curl http://192.168.150.53:8080/js/example.js
var word = "Hello, itbsl";
alert(word);[root@localhost ~]# 
[root@localhost ~]# curl http://192.168.150.53:8080/
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>title</title>

    <script type="text/javascript" src="js/example.js"></script>

</head>
<body>
helloworld
</body>
</html>[root@localhost ~]#

源码：

[root@localhost d0116]# cat x.go 
package main

import (
	"net/http"

	"github.com/gobuffalo/packr"
)

func main() {
	// dist 目录下拥有前端用vue打包好的一系列静态资源
	box := packr.NewBox("./static")
	http.Handle("/", http.FileServer(box))
	http.ListenAndServe(":8080", nil)
}

/*
1.packr
2.go build x.go a_main-packr.go

*/


[root@localhost d0116]# cat a_main-packr.go 
// Code generated by github.com/gobuffalo/packr. DO NOT EDIT.

package main

import "github.com/gobuffalo/packr"

// You can use the "packr clean" command to clean up this,
// and any other packr generated files.
func init() {
	packr.PackJSONBytes("./static", "index.html", "\"PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KPGhlYWQ+CiAgICA8bWV0YSBjaGFyc2V0PSJVVEYtOCI+CiAgICA8dGl0bGU+dGl0bGU8L3RpdGxlPgoKICAgIDxzY3JpcHQgdHlwZT0idGV4dC9qYXZhc2NyaXB0IiBzcmM9ImpzL2V4YW1wbGUuanMiPjwvc2NyaXB0PgoKPC9oZWFkPgo8Ym9keT4KaGVsbG93b3JsZAo8L2JvZHk+CjwvaHRtbD4=\"")
	packr.PackJSONBytes("./static", "index2.html", "\"PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KPGhlYWQ+CiAgICA8bWV0YSBjaGFyc2V0PSJVVEYtOCI+CiAgICA8dGl0bGU+dGl0bGU8L3RpdGxlPgo8L2hlYWQ+Cjxib2R5PgpoZWxsb3dvcmxkMgo8L2JvZHk+CjwvaHRtbD4=\"")
	packr.PackJSONBytes("./static", "js/example.js", "\"dmFyIHdvcmQgPSAiSGVsbG8sIGl0YnNsIjsKYWxlcnQod29yZCk7\"")
}


[root@localhost d0116]# cd static/
[root@localhost static]# ll
total 12
-rw-r--r--. 1 root root  134 Jan 16 20:41 index2.html
-rw-r--r--. 1 root root  200 Jan 16 20:36 index.html
drwxr-xr-x. 2 root root 4096 Jan 16 20:37 js
[root@localhost static]# cat js/example.js 
var word = "Hello, itbsl";
alert(word);[root@localhost static]# 
[root@localhost static]# 
[root@localhost static]# cat index.html 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>title</title>

    <script type="text/javascript" src="js/example.js"></script>

</head>
<body>
helloworld
</body>

参考
https://www.xhyonline.com/?p=1161