【One by one系列】一步步学习Golang web框架Gin

一步步学习Golang web框架Gin

建立项目

go mod 管理依赖

cd $gopathsrcgithub.comcarfieldWebapi

go mod init
如果不是在gopath下，其实也是提倡不在gopath下做开发，

go mod init后需要跟具体路径

go mod init github.comcarfieldWebapi
go get -u github.com/gin-gonic/gin

就可以看到在srcgithub.comcarfieldWebapi 生成了go.mod文件

module github.com/carfield

go 1.13

下载gin包

go get -u github.com/gin-gonic/gin

ps:由于众所周知的原因，大概率是下不动，所以请修改代理

修改代理

go env -w GOPROXY=https://goproxy.cn,direct

再次执行

go get -u github.com/gin-gonic/gin

再次打开go.mod文件

module github.com/carfield

go 1.13

require (
	github.com/gin-gonic/gin v1.5.0 // indirect
	github.com/go-playground/universal-translator v0.17.0 // indirect
	github.com/go-sql-driver/mysql v1.5.0 // indirect
	github.com/json-iterator/go v1.1.9 // indirect
	github.com/leodido/go-urn v1.2.0 // indirect
	github.com/mattn/go-isatty v0.0.11 // indirect
	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
	github.com/modern-go/reflect2 v1.0.1 // indirect
	golang.org/x/sys v0.0.0-20200117145432-59e60aa80a0c // indirect
	gopkg.in/go-playground/validator.v9 v9.31.0 // indirect
	gopkg.in/yaml.v2 v2.2.7 // indirect
)

• module定义包名
• require用来定义依赖包及版本
• indirect表示间接引用

快速开始

import "github.com/gin-gonic/gin"

package main

import (
	"net/http"

	"github.com/gin-gonic/gin"	
)

func main() {
	r := gin.Default()
	r.GET("/", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{
			"message": "hello,go-gin wholeheartedly at your service",
		})
	})

	
	r.Run() // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
}