go gin Next()方法

示例

gin Next()使用方法

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"net/http"
)

func main() {

	r := gin.Default()
	m1 := func(c *gin.Context) {
		fmt.Println("m1 start")
		//c.Next()会跳过当前中间件后续的逻辑，类似defer，最后再执行c.Next后面的逻辑
		//多个c.Next()谁在前面谁后执行，跟defer很像，类似先进后出的栈
		c.Next()
		fmt.Println("m1 end")
	}
	m2 := func(c *gin.Context) {
		fmt.Println("m2 start")
		//该方法会阻止业务逻辑以及该中间件后面中间件执行，但是不会阻止该中间件后面的逻辑执行包括c.Next()
		//c.Abort()
		c.Next()
		fmt.Println("m2 end")
	}
	m3 := func(c *gin.Context) {
		fmt.Println("m3 start")
		c.Next()
		fmt.Println("m3 end")
	}
	r.Use(m1, m2, m3)
	r.GET("/", func(context *gin.Context) {
		context.Next()
		context.JSON(http.StatusOK, gin.H{
			"message": "demo",
		})
		fmt.Println("hello world!!")
	})

	r.Run(":8081")
}

命令行输出

[GIN-debug] Listening and serving HTTP on :8081
m1 start
m2 start
m3 start
hello world!!
m3 end
m2 end
m1 end
[GIN] 2021/03/26 - 12:40:40 |?[97;42m 200 ?[0m|      1.5781ms |       127.0.0.1 |?[97;44m GET     ?[0m "/"