How to create and import local package in golang

Table of contents

Create your own project directory

Create pack1 package directory and source files

Create pack2 directory and source files

Create main package and source code files

example validation

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This article is an example written by myself based on the narration of golang doc, read more doc without overturning https://go.dev/doc/

You can refer to How to Write Go Code - The Go Programming Language to understand the package module, path, directory related concepts in golang, and understand the Code organization of golang

The following is a simple example to illustrate how to create and import a local package. I have created two local packages here, pack1 and pack2 respectively. The example shows how to import it into your own project.

First look at the project structure, and then introduce it step by step

Create your own project directory

mkdir my_project && cd my_project

Create pack1 package directory and source files

Here I use two local packages pack1 and pack2 as an example

mkdir pack1 && cd pack1

vi pack1.go edit the source code file of pack1, and edit the following content

package pack1

import "fmt"

func HelloPack1() {
        fmt.Println("Hello This Pack1")
}

Create pack2 directory and source files

cd to the project directory

mkdir pack2 && cd pack2

vi pack2.go edit the source code file of pack2, and edit the following content

package pack2

import "fmt"

func HelloPack2() {
        fmt.Println("Hello This Pack2")
}

Create main package and source code files

cd to the project directory, vi main.go edit the source code file main.go of the main package, edit the following content

package main

import (
        "fmt"
        "my_project/pack1"
        "my_project/pack2"

)

func main() {
        fmt.Println("Hello This main")
        pack1.HelloPack1()
        pack2.HelloPack2()
}

Create a module my_project in the project directory

go mod init my_project

example validation

Run the project after creating the module

go run main.go