gin-安装，修改启动端口，get/post 请求参数，模型绑定shouldbind,自定义验证器/表单验证

目录

• 第一步初始化
• 修改启动端口
• get请求url取参数
• Post请求获取form参数
• 模型绑定ShouldBind
  • ShouldBindJSON
  • ShouldBinduri
  • ShouldBindQuery
• 自定义验证器，表单验证

 

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 } 

选择了IT，必定终身学习