golang快速入门（五）初尝web服务

提示：本系列文章适合对Go有持续冲动的读者

初探golang web服务

golang web开发是其一项重要且有竞争力的应用，本小结来看看再golang中怎么创建一个简单的web服务。

net/http

net/http

package main

import (

	//"log"

	"fmt"

	"net/http"

)

func main() {

	http.HandleFunc("/", handler)

	http.ListenAndServe("localhost:6677", nil)

}

func handler(w http.ResponseWriter, r *http.Request) {

	fmt.Fprintf(w, "url.path=%q\n", r.URL.Path)  //输出到文件流

}

http.HandleFunc

http.ListenAndServe

handlerhttp.ResponseWriterhttp.Request

[root@VM-0-5-centos ~]# curl localhost:6677/123

url.path="/123"

我们通过handler函数来对访问url做访问数计算。

sync

package main

import (

	//"log"

	"fmt"

	"net/http"

	"sync"

)

var count int

var mutex sync.Mutex //使用互斥锁

func main() {

	http.HandleFunc("/", handler)

	http.ListenAndServe("localhost:6677", nil)

}

func handler(w http.ResponseWriter, r *http.Request) {

	mutex.Lock()

	count++

	mutex.Unlock()

	fmt.Fprintf(w, "request url.path:%q has %d times\n", r.URL.Path, count)

}

我们来看看请求结果如下：

[root@VM-0-5-centos ~]# curl localhost:6677/golang

request url.path:"/golang" has 1 times

[root@VM-0-5-centos ~]# curl localhost:6677/golang

request url.path:"/golang" has 2 times

[root@VM-0-5-centos ~]# curl localhost:6677/golang

request url.path:"/golang" has 3 times

http.RequestURL.PathMethodProtohandler

package main

import (

	//"log"

	"fmt"

	"net/http"

	"sync"

)

var count int

var mutex sync.Mutex //使用互斥锁

func main() {

	http.HandleFunc("/", handler)

	http.ListenAndServe("localhost:6677", nil)

}

func handler(w http.ResponseWriter, r *http.Request) {

	fmt.Fprintf(w, "%s,%s,%s,\n", r.Method, r.URL, r.Proto)

	fmt.Fprintf(w, "host:%q\nremoteaddr:%q\n", r.Host, r.RemoteAddr)

	for k, v := range r.Header {

		fmt.Fprintf(w, "Header[%q]:%q\n", k, v)

	}

	for k, v := range r.Form {

		fmt.Fprintf(w, "Form[%q]:%q\n", k, v)

	}

}

创建表单接受后输出如下：

//output

GET,/helloweb,HTTP/1.1,

host:"localhost:6677"

remoteaddr:"127.0.0.1:58088"

Header["User-Agent"]:["curl/7.29.0"]

Header["Accept"]:["*/*"]

Form[parm1]:hello

Form[parm2]:web

本次简单的了解了一下golang web服务，也是初尝章节结束。接下来会比较深入的学习golang的精彩细节与精华。

文章有不足的地方欢迎在评论区指出。

欢迎收藏、点赞、提问。关注顶级饮水机管理员，除了管烧热水，有时还做点别的。