Golang uses embed to introduce instance code for static files

Go language has introduced a new standard library since version 1.16.embed, static files can be introduced into binary files

instruction:/go:embed

A simple small example demonstrates the introduction of static files into golang's binary packaging product

Project structure

$ tree
.
├── 
└── static
    └── 

File content

Hello World!

1. Introduce the content of the static file to the variable

package main

import (
    "embed"
    "fmt"
)

// Introduce the content of the static file to the variable content//go:embed static/
var content string

// Note that this statement is needed. Although it is not used, you can introduce files in the entire directory.//go:embed static/*
var tmplFS 

func main() {
    (content)
}

Output

Hello World!

2. Introduce all files in the entire directory

package main

import (
    "embed"
    "fmt"
)

//go:embed static/*
var tmplFS 

func main() {
    // Read file content    content, _ := ("static/")

    (string(content))
    // Hello World!
}

Copy the packaged product to any other directory to run, and you can also read the contents of the static file.

#Compilation$ go build 

# Copy to any other directory to run./main
Hello World!

Need to note:

• To introduce a packageembed
• //go:embedIt is a whole, and there cannot be spaces behind the double oblique rods, for example:// go:embedIt's invalid

Extension: In projects separated by front-end and back-end, the front-end packaging products can be embedded into golang's binary packaging products and released together.

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