golang快速入门[7.1]-项目与依赖管理-gopath

前文

前言

gopath

gopath是什么

gopathgorootgo envgo env gopath

C:\Windows\system32> go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\jackson\AppData\Local\go-build
set GOENV=C:\Users\jackson\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\jackson\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=c:\go
...

$HOME/go%USERPROFILE%\ggopathsrcbinpkg

go/
├── bin
├── pkg
└── src

$GOPATH/bingo install$GOPATH/pkgdarwin_amd64go module$GOPATH/src

go/
├── bin
     └── main.exe
├── pkg
     ├── darwin_amd64
     └── mod
└── src
    ├── github.com
    │   ├── tylfin
    │   │   ├── dynatomic
    │   │   └── geospy
    │   └── uudashr
    │       └── gopkgs
    └── golang.org
        └── x
            └── tools

go get$GOPATH/srcgo get github.com/dreamerjackson/theWayToGolang

go/
├── bin
├── pkg
└── src
    └── github.com
           └── dreamerjackson
                     └── theWayToGolang

go get-u$GOPATH/srcfmt

import "blue/red"

$GOPATH/src/blue/red

同理,如果导入为

import "github.com/gobuffalo/buffalo"

$GOPATH/src/github.com/gobuffalo/buffalo

下面我们用一个例子来说明导入第三方包

$GOPATH/srcmymathadd.go

» mkdir mymath
» cd mymath
» touch add.go

add.go的内容如下，要注意导出的函数必须是首字母大写的，这是go语言的规则。

package mymath

func Add(a int, b int) int {
    return a + b
}

$GOPATH/srcmymathadd

package main

import (
    "fmt"
    "mymath"
)

func main() {
    result := mymath.Add(1, 2)
    fmt.Println("result:", result)
}

go run main.go1+23

gopath的优劣

gopath

总结

go modulego modulego module

参考资料

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