一、全局中间件
- 所有请求都经过此中间件 ```go package main
import ( “fmt” “time”
"github.com/gin-gonic/gin"
)
// 定义中间 func MiddleWare() gin.HandlerFunc { return func(c *gin.Context) { t := time.Now() fmt.Println(“中间件开始执行了”) // 设置变量到Context的key中,可以通过Get()取 c.Set(“request”, “中间件”) status := c.Writer.Status() fmt.Println(“中间件执行完毕”, status) t2 := time.Since(t) fmt.Println(“time:”, t2) } }
func main() { // 1.创建路由 // 默认使用了2个中间件Logger(), Recovery() r := gin.Default() // 注册中间件 r.Use(MiddleWare()) // {}为了代码规范 { r.GET(“/ce”, func(c *gin.Context) { // 取值 req, _ := c.Get(“request”) fmt.Println(“request:”, req) // 页面接收 c.JSON(200, gin.H{“request”: req}) })
}
r.Run()
}
![image.png](https://cdn.nlark.com/yuque/0/2022/png/21940000/1655194836878-b1591ef9-d5ff-4aaf-bea5-c3bee95fa66f.png#clientId=ud016ed0a-2570-4&crop=0&crop=0&crop=1&crop=1&from=paste&height=180&id=u9a28ad68&margin=%5Bobject%20Object%5D&name=image.png&originHeight=180&originWidth=725&originalType=binary&ratio=1&rotation=0&showTitle=false&size=15166&status=done&style=none&taskId=ucf9cf320-8f12-4a0b-a527-ea749af77f4&title=&width=725)<br />![image.png](https://cdn.nlark.com/yuque/0/2022/png/21940000/1655194892109-96276271-b936-4121-9fef-a3948c33a041.png#clientId=ud016ed0a-2570-4&crop=0&crop=0&crop=1&crop=1&from=paste&height=161&id=u94c37ad9&margin=%5Bobject%20Object%5D&name=image.png&originHeight=161&originWidth=333&originalType=binary&ratio=1&rotation=0&showTitle=false&size=6083&status=done&style=none&taskId=u14eed38d-b8e0-4a93-b1ef-5c442b6963b&title=&width=333)
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# 二、Next()方法
```go
package main
import (
"fmt"
"time"
"github.com/gin-gonic/gin"
)
// 定义中间
func MiddleWare() gin.HandlerFunc {
return func(c *gin.Context) {
t := time.Now()
fmt.Println("中间件开始执行了")
// 设置变量到Context的key中,可以通过Get()取
c.Set("request", "中间件")
// 执行函数
c.Next()
// 中间件执行完后续的一些事情
status := c.Writer.Status()
fmt.Println("中间件执行完毕", status)
t2 := time.Since(t)
fmt.Println("time:", t2)
}
}
func main() {
// 1.创建路由
// 默认使用了2个中间件Logger(), Recovery()
r := gin.Default()
// 注册中间件
r.Use(MiddleWare())
// {}为了代码规范
{
r.GET("/ce", func(c *gin.Context) {
// 取值
req, _ := c.Get("request")
fmt.Println("request:", req)
// 页面接收
c.JSON(200, gin.H{"request": req})
})
}
r.Run()
}