Golang Web路由动态匹配与参数解析技巧

router := mux.NewRouter()
router.HandleFunc("/users/{id}", getUserHandler).Methods("GET")
router.HandleFunc("/posts/{year:[0-9]{4}}/{month:[0-9]{2}}", listPostsHandler)

vars := mux.Vars(r)
id := vars["id"]

r := gin.Default()
r.GET("/users/:id", func(c *gin.Context) {
    id := c.Param("id")
    c.String(200, "User ID: %s", id)
})
r.GET("/files/*filepath", func(c *gin.Context) {
    path := c.Param("filepath")
    c.String(200, "File: %s", path)
})

name := c.Query("name") // 获取 query 中的 name，默认 ""
age := c.DefaultQuery("age", "18") // 带默认值

username := c.PostForm("username")
password := c.DefaultPostForm("password", "123456")

type LoginReq struct {
    User     string `form:"user" binding:"required"`
    Password string `form:"password" binding:"required"`
}
var req LoginReq
if err := c.ShouldBind(&req); err != nil {
    c.JSON(400, gin.H{"error": err.Error()})
    return
}

r.Use(func(c *gin.Context) {
    fmt.Printf("Path: %s, Params: %v\n", c.Request.URL.Path, c.Params)
    c.Next()
})