Ubuntu 安裝最新版 (1.12) Golang 並使用 go mod

 

wget https://dl.google.com/go/go1.12.4.linux-amd64.tar.gz

sudo tar -zxvf go1.12.4.linux-amd64.tar.gz -C /opt

檢查安裝是否成功

cd /opt/go/bin ./go version go version go1.12.4 linux/amd64 

設置環境變量

vi /etc/profile

export GOROOT=/opt/go export GOPATH=/home/ubuntu/go export GOPROXY=https://goproxy.io export GOARCH=amd64 export GOOS=linux export GOTOOLS=$GOROOT/pkg/tool export PATH=$PATH:$GOROOT/bin:$GOPATH/bin source /etc/profile

其中，GOPROXY 可以解決 golang.org/x/... 系列包無法下載的問題。

編寫 HelloWorld 文件，測試運行環境。

package main import "fmt" func main(){ fmt.Println("hello,world!") }

go run hello.go
go build hello.go 

創建 go.mod 文件

go mod init hello

用 Gin 實現一個簡單的 http 服務

import ( "gopkg.in/gin-gonic/gin.v1" "net/http" ) func main(){ router := gin.Default() router.GET("/", func(c *gin.Context) { c.String(http.StatusOK, "Hello World") }) router.Run(":8000") }

直接編譯執行 

go run hello

可以看到引用的包都被自動下載了

go: finding github.com/gin-contrib/sse latest
go: finding github.com/gin-gonic/gin/render latest
go: finding github.com/gin-gonic/gin/binding latest
go: finding github.com/gin-gonic/gin/json latest
go: finding golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223
go: downloading golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223
go: finding gopkg.in/go-playground/validator.v8 v8.18.2
go: finding github.com/ugorji/go/codec latest
go: finding github.com/golang/protobuf/proto latest
go: finding gopkg.in/yaml.v2 v2.2.2
go: downloading gopkg.in/go-playground/validator.v8 v8.18.2
go: downloading gopkg.in/yaml.v2 v2.2.2
go: finding github.com/ugorji/go v1.1.4
go: finding github.com/golang/protobuf v1.3.1
go: downloading github.com/ugorji/go v1.1.4
go: downloading github.com/golang/protobuf v1.3.1
go: extracting gopkg.in/go-playground/validator.v8 v8.18.2
go: extracting gopkg.in/yaml.v2 v2.2.2
go: extracting github.com/golang/protobuf v1.3.1
go: extracting github.com/ugorji/go v1.1.4
go: extracting golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223
go: finding gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405

HTTP 服務啟動正常，可以通過瀏覽器訪問了。

[GIN-debug] [WARNING] Now Gin requires Go 1.6 or later and Go 1.7 will be required soon.

[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production. - using env: export GIN_MODE=release - using code: gin.SetMode(gin.ReleaseMode) [GIN-debug] GET / --> main.main.func1 (3 handlers) [GIN-debug] Listening and serving HTTP on :8000