Go Web --- 使用cookie

设置cookie

package main

import (
	"net/http"
)

func index(response http.ResponseWriter, request *http.Request) {
	c1 := http.Cookie{
		Name:     "first",
		Value:    "this is the first cookie",
		HttpOnly: true,
	}
	c2 := http.Cookie{
		Name:     "first",
		Value:    "this is the third cookie",
		HttpOnly: true,
	}
	//	方法一
	//func (h Header) Set(key, value string)
	//设置cookie，set方法会覆盖已有项
	//response.Header().Set("Set-Cookie", c1.String())

	//func (h Header) Add(key, value string)
	//追加，并不会覆盖，如果之前没有此项，则会添加
	//response.Header().Add("Set-Cookie", c2.String())

	//	方法二
	//func SetCookie(w ResponseWriter, cookie *Cookie)
	//虽然是set，但是不会覆盖，即使是Name相同，也不会覆盖，只是追加
	http.SetCookie(response, &c1)
	http.SetCookie(response, &c2)
}
func main() {
	server := http.Server{
		Addr: "127.0.0.1:8081",
	}
	http.HandleFunc("/index", index)
	server.ListenAndServe()
}

　　推荐使用第二种方法：http.SetCookie(request,&c)

　　注意，如果使用response.Header().Set或者Add设置cookie时，key必须是Set-Cookie，否则设置的就不是cookie，而是header头部字段而已。

 

获取请求中的cookie

　　　request.Header["Cookie"]

package main

import (
	"fmt"
	"net/http"
)

func index(response http.ResponseWriter, request *http.Request) {
	c1 := http.Cookie{
		Name:     "first",
		Value:    "this is the first cookie",
		HttpOnly: true,
	}
	c2 := http.Cookie{
		Name:     "second",
		Value:    "this is the third cookie",
		HttpOnly: true,
	}
	http.SetCookie(response, &c1)
	http.SetCookie(response, &c2)
}

//获取cookie
func getCookie(response http.ResponseWriter, request *http.Request) {
	cookie := request.Header["Cookie"]//注意键Cookie的首字母大写
	fmt.Fprintln(response, cookie)
	//[first="this is the first cookie"; second="this is the third cookie"]
}
func main() {
	server := http.Server{
		Addr: "127.0.0.1:8081",
	}
	http.HandleFunc("/index", index)
	http.HandleFunc("/test", getCookie)
	server.ListenAndServe()
}

　　

更简便的获取cookie

//获取cookie
func getCookie(response http.ResponseWriter, request *http.Request) {
	first, _ := request.Cookie("third")
	cookies := request.Cookies()
	fmt.Fprintln(response,
		first,       //first="this is the first cookie"
		first.Value, //this is the first cookie
		//first.Expires  、first.Name 、first.Domain ...
		cookies, //[first="this is the first cookie" second="this is the third cookie"]
	)
}