gin使用中间件

原文：https://www.cnblogs.com/jachin/p/9966839.html

golang gin 中间件，返回结果

--------------

package main
 
import (
    "net/http"
    "github.com/gin-gonic/gin"
)
 
func response() gin.HandlerFunc {
    return func(c *gin.Context) {
        c.Next()
        if c.Writer.Written() {
            return
        }
 
        params := c.Keys
        if len(params) == 0 {
            return
        }
        c.JSON(http.StatusOK, params)
    }
}
 
func main() {
    r := gin.Default()
    r.Use(response())
 
    r.GET("/ping", func(c *gin.Context) {
        c.String(http.StatusOK, "PONG")
    })
 
    r.GET("/status", func(c *gin.Context) {
        c.Status(http.StatusOK)
    })
 
    r.GET("/hello", func(c *gin.Context) {
        c.Set("message", "hello, world")
    })
 
    r.Run()
}

　　

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➜  src  go run main.go [GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.   [GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.  - using env:   export GIN_MODE=release  - using code:  gin.SetMode(gin.ReleaseMode)   [GIN-debug] GET    /ping                     --> main.main.func1 (4 handlers) [GIN-debug] GET    /status                   --> main.main.func2 (4 handlers) [GIN-debug] GET    /hello                    --> main.main.func3 (4 handlers) [GIN-debug] Environment variable PORT is undefined. Using port :8080 by default [GIN-debug] Listening and serving HTTP on :8080 [GIN] 2018/11/15 - 23:23:23 | 200 |     128.732µs |       127.0.0.1 | GET      /ping [GIN] 2018/11/15 - 23:23:26 | 200 |       1.764µs |       127.0.0.1 | GET      /status [GIN] 2018/11/15 - 23:23:31 | 200 |      135.48µs |       127.0.0.1 | GET      /hello

　　

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➜  ~  http http://127.0.0.1:8080/ping HTTP/1.1 200 OK Content-Length: 4 Content-Type: text/plain; charset=utf-8 Date: Thu, 15 Nov 2018 15:23:23 GMT   PONG   ➜  ~  http http://127.0.0.1:8080/status HTTP/1.1 200 OK Content-Length: 0 Date: Thu, 15 Nov 2018 15:23:26 GMT       ➜  ~  http http://127.0.0.1:8080/hello HTTP/1.1 200 OK Content-Length: 26 Content-Type: application/json; charset=utf-8 Date: Thu, 15 Nov 2018 15:23:31 GMT   {     "message": "hello, world" }