日志

1. 写日志文件

func main() {
	// 禁用控制台颜色
	gin.DisableConsoleColor()

	// 创建记录日志的文件
	// os包提供了操作系统函数的不依赖平台的接口
	f, _ := os.Create("gin.log")
	// io包 读，写
	gin.DefaultWriter = io.MultiWriter(f)

	// 如果需要将日志同时写入文件和控制台，请使用以下代码
	// gin.DefaultWriter = io.MultiWriter(f, os.Stdout)

	router := gin.Default()
	router.GET("/ping", func(c *gin.Context) {
		c.String(200, "pong")
	})

	router.Run(":8080")
}

[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 (3 handlers)
[GIN-debug] Listening and serving HTTP on :8080
[GIN] 2020/06/16 - 17:19:21 | 404 |            0s |       127.0.0.1 | GET      "/user/:123456"
[GIN] 2020/06/16 - 17:19:25 | 200 |            0s |       127.0.0.1 | GET      "/ping"

2. 自定义日志

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

	// LoggerWithFormatter 中间件会将日志写入 gin.DefaultWriter
	// By default gin.DefaultWriter = os.Stdout
	router.Use(gin.LoggerWithFormatter(func(param gin.LogFormatterParams) string {

		// 你的自定义格式
		return fmt.Sprintf("%s - [%s] "%s %s %s %d %s "%s" %s"
",
			param.ClientIP,
			param.TimeStamp.Format(time.RFC1123),
			param.Method,
			param.Path,
			param.Request.Proto,
			param.StatusCode,
			param.Latency,
			param.Request.UserAgent(),
			param.ErrorMessage,
		)
	}))
	router.Use(gin.Recovery())

	router.GET("/ping", func(c *gin.Context) {
		c.String(200, "pong")
	})

	router.Run(":8080")
}