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go Gin安装及初始化操作示例_Golang_

2023-05-26 393人已围观

简介 go Gin安装及初始化操作示例_Golang_

第一步初始化

1.新建文件夹（项目名）

2.终端进入该项目，敲 go mod init gin-class 产生go.mode文件

3.golang打开，Go Modules设置GOPROXY=https://goproxy.io

4.新建mian.go，下面代码粘贴进去

5.运行

package main import "github.com/gin-gonic/gin" func main() { r := gin.Default() r.GET("/ping", func(c *gin.Context) { c.JSON(200, gin.H{ "message": "pong", }) }) r.Run() // listen and serve on 0.0.0.0:8080 }

修改启动端口

# 默认是8080端口 r.Run(":8888")

get请求url取参数

//get请求 "/get/123?user=jeff&pwd=admin" r.GET("/get/:id", func(c *gin.Context) { id := c.Param("id") user := c.DefaultQuery("user","jeff") pwd := c.Query("pwd") c.JSON(200, gin.H{ "message": "hell gyy", "id":id, "user":user, "pwd":pwd, }) })

Param：取“？”之前的参数

Query：取“？”之后的参数

DefaultQuery:优先取key值，没有就用默认值

Post请求获取form参数

r.POST("/post", func(c *gin.Context) { user := c.DefaultPostForm("user","jeff") pwd := c.PostForm("pwd") c.JSON(200, gin.H{ "message": "hell gyy", "user":user, "pwd":pwd, }) })

DefaultPostForm :优先取key值，没有就用默认值

PostForm:取key

模型绑定ShouldBind

ShouldBindJSON

package main import "github.com/gin-gonic/gin" type PostParams struct { Name string `json:"name"` Age int `json:"age"` Sex bool `json:"sex"` } func main() { r.POST("/testBind", func(c *gin.Context) { p := PostParams{} err := c.ShouldBindJSON(&p) if err != nil{ c.JSON(400,gin.H{ "msg":"出错！", "data":gin.H{}, }) }else{ c.JSON(200,gin.H{ "msg":"success", "data":p, }) } c.JSON(200, gin.H{ }) }) r.Run(":8888") // listen and serve on 0.0.0.0:8080 }

ShouldBinduri

package main import "github.com/gin-gonic/gin" func main() { r := gin.Default() //携带中间件启动路由 r.POST("/testBind/:name/:age/:sex", func(c *gin.Context) { p := PostParams{} err := c.ShouldBindUri(&p) if err != nil{ c.JSON(400,gin.H{ "msg":"出错！", "data":gin.H{}, }) }else{ c.JSON(200,gin.H{ "msg":"success", "data":p, }) } c.JSON(200, gin.H{ }) }) r.Run(":8888") // listen and serve on 0.0.0.0:8080 } type PostParams struct { Name string `json:"name" uri:"name"` Age int `json:"age" uri:"age"` Sex bool `json:"sex" uri:"ses"` }

ShouldBindQuery

package main import "github.com/gin-gonic/gin" func main() { r := gin.Default() //携带中间件启动路由 r.POST("/testBind", func(c *gin.Context) { p := PostParams{} err := c.ShouldBindQuery(&p) if err != nil{ c.JSON(400,gin.H{ "msg":"出错！", "data":gin.H{}, }) }else{ c.JSON(200,gin.H{ "msg":"success", "data":p, }) } c.JSON(200, gin.H{ }) }) r.Run(":8888") // listen and serve on 0.0.0.0:8080 } type PostParams struct { Name string `json:"name" uri:"name" form:"name"` Age int `json:"age" uri:"age" form:"age"` Sex bool `json:"sex" uri:"ses" form:"sex"` }

自定义验证器，表单验证

binding:"required,mustBig"

package main import ( "github.com/gin-gonic/gin" "github.com/gin-gonic/gin/binding" "github.com/go-playground/validator/v10" ) type PostParams struct { Name string `json:"name" uri:"name" form:"name"` Age int `json:"age" uri:"age" form:"age" binding:"required,mustBig"` Sex bool `json:"sex" uri:"ses" form:"sex"` } // 过滤年龄小于18 func mustBig(f1 validator.FieldLevel) bool { if f1.Field().Interface().(int) <=18{ return false } return true } func main() { r := gin.Default() //携带中间件启动路由 if v, ok := binding.Validator.Engine().(*validator.Validate); ok { v.RegisterValidation("mustBig", mustBig) } r.POST("/testBind", func(c *gin.Context) { p := PostParams{} err := c.ShouldBindJSON(&p) if err != nil{ c.JSON(400,gin.H{ "msg":"小于18岁了！", "data":gin.H{}, }) }else{ c.JSON(200,gin.H{ "msg":"success", "data":p, }) } c.JSON(200, gin.H{ }) }) r.Run(":8888") // listen and serve on 0.0.0.0:8080 }