beego3---gohttp底层实现

package main

//gohttp底层实现,通过gohttp不是通过beego实现的输出
//

import (
    "io"
    "log"
    "net/http"
)

func main() {
    //设置路由
    http.HandleFunc("/", sayHello)
    err := http.ListenAndServe(":8080", nil)
    if err != nil {
        log.Fatal(err)
    }
}

func sayHello(w http.ResponseWriter, r *http.Request) {
    io.WriteString(w, "hello vwesion1")
}

package main

//gohttp第二个版本：通过mux,handler实现路由

import (
    "io"
    "log"
    "net/http"
)

func main() {
    mux := http.NewServeMux()      //ServeMux//实现handler注册到ServeMux然后在进行路由的注册
    mux.Handle("/", &myHandler{})  //注册路由和handler
    mux.Handle("/hello", sayHello) //通过函数注册路由

    err := http.ListenAndServe(":8080", mux)
    if err != nil {
        log.Fatal(err)
    }
}

type myHandler struct { //这个handle要实现ServerHTTP方法

}

func (this *myHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    io.WriteString(w, "hello vwesion2，"+r.URL.String())
}

func sayHello(w http.ResponseWriter, r *http.Request) {
    io.WriteString(w, "hello vwesion2，"+r.URL.String())
}

package main

//模拟gohttp底层，第三个版本

import (
    "fmt"
    "io"
    "log"
    "net/http"
    "os" //获取静态文件
    "time"
)

func main() {
    server := http.Server{
        Addr:        ":8080",
        Handler:     &myHandler{}, //自定义handler
        ReadTimeout: 5 * time.Second,
    }

    myMux = make(map[string]func(http.ResponseWriter, *http.Request)) //初始化map
    myMux["/"] = sayHello                                             //访问根目录调用sayHellp方法
    myMux["/bye"] = sayBye                                            //访问/bye调用sayBye方法

    err := server.ListenAndServe()
    if err != nil {
        log.Fatal(err)
    }
}

type myHandler struct{}

func (this *myHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { //handler来解析url，调用不同的方法，
    if h, ok := myMux[r.URL.String()]; ok { //if ok 对map的断言，ok是判断存不存在，h是获取的map的value,
        fmt.Println(h, ok)
        h(w, r)
        return
    }
    io.WriteString(w, "uuuu，"+r.URL.String())
}

var myMux map[string]func(http.ResponseWriter, *http.Request) //自定义mux,根据不同的string调用不同的方法

func sayHello(w http.ResponseWriter, r *http.Request) {
    io.WriteString(w, "hello "+r.URL.String())
}

func sayBye(w http.ResponseWriter, r *http.Request) {
    io.WriteString(w, "sayBye "+r.URL.String())
}

package main

//获取静态文件

import (
    "io"
    "log"
    "net/http"
    "os" //获取路径，静态文件服务器要获取绝对路径，根据当前路径定位到绝对路径，
)

func main() {
    mux := http.NewServeMux()      //ServeMux//实现handler注册到ServeMux然后在进行路由的注册
    mux.Handle("/", &myHandler{})  //注册路由和handler
    mux.Handle("/hello", sayHello) //通过函数注册路由

    wd, err := os.Getwd() //wd是当前路径
    if err != nil {
        log.Fatal(err)
    }

    mux.Handle("/static/",
        http.StripPrefix("/static/", http.FileServer(http.Dir(wd)))) //StripPrefix去除static前缀

    err = http.ListenAndServe(":8080", mux)
    if err != nil {
        log.Fatal(err)
    }
}

type myHandler struct { //这个handle要实现ServerHTTP方法

}

func (this *myHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    io.WriteString(w, "hello vwesion2，"+r.URL.String())
}

func sayHello(w http.ResponseWriter, r *http.Request) {
    io.WriteString(w, "hello vwesion2，"+r.URL.String())
}