Go——gin 框架基本入门
概述
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为何不选择 beego，理由很简单，其设计风格已经不符合现在开发潮流，现实往往就是这样，看似完美实则鸡肋
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gin 最大的特点，也是我最为看重的就是中间件功能，说真的，当我在 gin 框架中看到 next 这个关键字，心里真的有点小激动
中间件
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全局中间件
import ( "log" "net/http" "github.com/gin-gonic/gin" ) func logger() gin.HandlerFunc { return func(c *gin.Context) { log.Println("before is next") c.Next() log.Println("after is next ") } } func main() { r := gin.New() r.Use(logger()) r.GET("/user/:name", func(c *gin.Context) { name := c.Param("name") c.String(http.StatusOK, "Hello %s", name) }) r.GET("/topic/:id", func(c *gin.Context) { id := c.Param("id") c.String(http.StatusOK, "you search is %s", id) }) r.Run(":8080") } -
路由中间件
func m1() gin.HandlerFunc { return func(c *gin.Context) { log.Println("before is m1") c.Next() log.Println("after is m1 ") } } func m2() gin.HandlerFunc { return func(c *gin.Context) { log.Println("before is m2") c.Next() log.Println("after is m2 ") } } func main() { r := gin.New() r.GET("/user/:name", m1(), func(c *gin.Context) { name := c.Param("name") c.String(http.StatusOK, "Hello %s", name) }) r.GET("/topic/:id", m2(), func(c *gin.Context) { id := c.Param("id") c.String(http.StatusOK, "you search is %s", id) }) r.Run(":8080") } -
路由组中间件
func main() { r := gin.New() v1 := r.Group("v1", m1()) v1.GET("/user/:name", func(c *gin.Context) { name := c.Param("name") c.String(http.StatusOK, "Hello %s", name) }) v1.GET("/topic/:id", func(c *gin.Context) { id := c.Param("id") c.String(http.StatusOK, "you search is %s", id) }) v2 := r.Group("v2", m2()) v2.GET("/user/:name", func(c *gin.Context) { name := c.Param("name") c.String(http.StatusOK, "Hello %s", name) }) v2.GET("/topic/:id", func(c *gin.Context) { id := c.Param("id") c.String(http.StatusOK, "you search is %s", id) }) r.Run(":8080") } -
在中间件或处理程序中启动新的 Goroutines 时，您不应该使用其中的原始上下文，您必须使用只读副本
func main() { r := gin.Default() r.GET("/long_async", func(c *gin.Context) { // create copy to be used inside the goroutine cCp := c.Copy() go func() { // simulate a long task with time.Sleep(). 5 seconds time.Sleep(5 * time.Second) // note that you are using the copied context "cCp", IMPORTANT log.Println("Done! in path " + cCp.Request.URL.Path) }() }) r.GET("/long_sync", func(c *gin.Context) { // simulate a long task with time.Sleep(). 5 seconds time.Sleep(5 * time.Second) // since we are NOT using a goroutine, we do not have to copy the context log.Println("Done! in path " + c.Request.URL.Path) }) // Listen and serve on 0.0.0.0:8080 r.Run(":8080") }
