golang GIN

GIN是golang的一个web 框架，它拥有很高的性能。

安装

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

 代码中引入

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

 快速使用

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
}

运行： go run main.go

使用API

func main() {

    // Creates a gin router with default middleware:
    // logger and recovery (crash-free) middleware
    router := gin.Default()

    router.GET("/someGet", nil)
    router.POST("/somePost", nil)
    router.PUT("/somePut", nil)
    router.DELETE("/someDelete", nil)
    router.PATCH("/somePatch", nil)
    router.HEAD("/someHead", nil)
    router.OPTIONS("/someOptions", nil)

    router.Run()
}

可以很容易的提供GET,POST,PUT,DELETE等API

GET的query paramter

func main() {
    router := gin.Default()

    // Query string parameters are parsed using the existing underlying request object.
    // The request responds to a url matching:  /welcome?firstname=Jane&lastname=Doe
    router.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)
    })
    router.Run(":8080")
}

DefaultQuery 和 Query可以用来获取query paramter

DefaultQuery，如果没有这个参数，则返回一个默认值，

Query 如果没有这个值，则返回""

POST的post form

func main() {
    router := gin.Default()

    router.POST("/form_post", func(c *gin.Context) {
        message := c.PostForm("message")
        nick := c.DefaultPostForm("nick", "anonymous")

        c.JSON(200, gin.H{
            "status":  "posted",
            "message": message,
            "nick":    nick,
        })
    })
    router.Run(":8080")
}

使用postman 发起psot 请求

POST /form_post HTTP/1.1
Host: localhost:8080
token: mtoken
Content-Type: application/x-www-form-urlencoded
cache-control: no-cache
Postman-Token: e53e47cb-5a79-4907-9d77-82942236b203
message=hellonick=lisiundefined=undefined

结果

{
    "message": "hello",
    "nick": "lisi",
    "status": "posted"
}

使用Map作为get或者get的参数

使用postman发起请求

POST /post?ids[a]=12& ids[b]=34 HTTP/1.1
Host: localhost:8080
token: mtoken
Content-Type: application/x-www-form-urlencoded
cache-control: no-cache
Postman-Token: cbda56d4-2d9c-41d1-8f98-b43c00dd75a0
names%5Ba%5D=firstnames%5Bb%5D=lastundefined=undefined

最后打印结果

ids: map[a:12 b:34]; names: map[a:first b:last]

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