How to correctly import custom packages under Go Modules?

Go Modules is a dependency management tool for Go language. Correct import of custom packages is the key to efficient development. This article provides detailed solutions to the problem of importing custom packages under Go Modules.

Many developers encounter errors in importing custom packages when using Go Modules. For example, attempting to import a custom package named test01 failed. This is usually because the go.mod file is configured incorrectly or the Go Modules mode is not enabled correctly. Manually creating go.mod files is not a best practice, Go Modules recommends using go commands to automatically generate.

First, make sure Go Modules is enabled and set up a proxy:

 go env -w GO111MODULE=on
go env -w GOPROXY=https://goproxy.io,direct

Then, run the following command in the project root directory to initialize Go Modules:

 go mod init your-module-path // Replace your-module-path with your project module path, for example github.com/yourname/yourproject

This will automatically generate a correct go.mod file. After that, in your main.go file, import the custom package test01 using the correct import path:

 import "your-module-path/test01" // your-module-path needs to be replaced with your project module path

Make sure that the directory structure of test01 package is consistent with your-module-path/test01 path.

It is recommended to use IDEs such as GoLand for development. The code prompts and debugging functions provided by it can effectively improve development efficiency and reduce error rates. Avoid manually editing go.mod file. Use the go mod init command to ensure the correctness of go.mod file and avoid errors caused by manual operations.

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