gin 入门

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

在现有mod项目中，impot gin即可

package main

import (
	"net/http"

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

func main() {
	r := gin.Default()
	// This handler will match /user/john but will not match /user/ or /user
	r.GET("/user/:name", func(c *gin.Context) {
		name := c.Param("name")
		c.String(http.StatusOK, "hello %s", name)
	})

	// However, this one will match /user/john/ and also /user/john/send
	// If no other routers match /user/john, it will redirect to /user/john/
	r.GET("/user/:name/:action", func(c *gin.Context) {
		name := c.Param("name")
		action := c.Param("action")
		message := name + " is " + action
		c.String(http.StatusOK, message)
	})

	// For each matched request Context will hold the route definition
	r.POST("/user/:name/*action", func(c *gin.Context) {
		b := c.FullPath() == "/user/:name/*action"
		c.String(http.StatusOK, "%t", b)
	})

	// This handler will add a new router for /user/groups.
	// Exact routes are resolved before param routes, regardless of the order they were defined.
	// Routes starting with /user/groups are never interpreted as /user/:name/... routes
	r.GET("/user/groups", func(c *gin.Context) {
		c.String(http.StatusOK, "The available groups are [...]")
	})

	// Query string parameters are parsed using the existing underlying request object.
	// The request responds to a url matching:  /welcome?firstname=Jane&lastname=Doe
	r.GET("/welcome", func(c *gin.Context) {
		firstname := c.DefaultQuery("firstname", "Guest")
		lastname := c.Query("lastname") // shortcut for c.Request.URL.Query().Get("lastname")

		c.String(http.StatusOK, "Hello %s %s", firstname, lastname)
	})

	//r.Run()
	r.Run(":3000")
}