Question

我试图在我的项目中链接处理程序。

package main

import (
    "database/sql"
    "fmt"
    "net/http"
)

func loggingHandler(next http.Handler) http.Handler {
    fn := func(w http.ResponseWriter, r *http.Request) {
        next.ServeHTTP(w, r)
    }
    return http.HandlerFunc(fn)
}

func loginHandler(res http.ResponseWriter, req *http.Request) {
    if req.Method != "POST" {
        http.ServeFile(res, req, "login.html")
        return
    }
    // some code
}

func MainPageHandler(res http.ResponseWriter, req *http.Request) {
    // some code
}

func main() {
    db, err = sql.Open("", "password@()/db name")
    if err != nil {
        fmt.Println(err)
    }
    defer db.Close()
    commonHandlers := alice.New(loggingHandler)
    http.Handle("/Login", commonHandlers.ThenFunc(loginHandler))
    http.Handle("/", commonHandlers.ThenFunc(MainPageHandler))
    http.ListenAndServe(":8080", nil)
}

我该怎么做才能获得输出？提前谢谢。

Answer 1

请求处理程序可以通过传递http.ResponseWriter作为第一个参数，使用任何fmt Fprint* methods来编写响应。

例如：

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "URL.Path = %q\n", r.URL.Path)
}

golang的中间件

1 个答案: