Golang之http编程 

Go原生支持http。import("net/http")
Go的http服务性能和nginx比较接近
几行代码就可以实现一个web服务

服务端http

package main

import (
    "fmt"
    "net/http"
)

func Hello(w http.ResponseWriter, r *http.Request) {
    fmt.Println("handle hello")
    fmt.Fprintf(w, "hello")
}
func Login(w http.ResponseWriter, r *http.Request) {
    fmt.Println("handle login")
    fmt.Fprintf(w, "login....")
}


func main() {
    http.HandleFunc("/", Hello)
    http.HandleFunc("/user/login", Login)
    err := http.ListenAndServe("127.0.0.1:8800", nil)
    if err != nil {
        fmt.Println("htpp listen failed")
    }
}

http客户端

package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    res, err := http.Get("https://www.baidu.com/")
    if err != nil {
        fmt.Println("get err:", err)
        return
    }
    data, err := ioutil.ReadAll(res.Body)
    if err != nil {
        fmt.Println("get data err:", err)
        return
    }
    fmt.Println(string(data))
}

http_head

package main

import (
    "fmt"
    "net/http"
)

var url = []string{
    "http://www.baidu.com",
    "http://google.com",
    "http://taobao.com",
}

func main() {
    for _, v := range url {
        res, err := http.Head(v)
        if err != nil {
            fmt.Printf("head %s failed,err:%v\n", v, err)
            continue
        }
        fmt.Printf("head succ,status:%v\n", res.Status)
    }
}

http_head自定义超时写法

package main

import (
    "fmt"
    "net"
    "net/http"
    "time"
)

var url = []string{
    "http://www.baidu.com",
    "http://google.com",
    "http://taobao.com",
}

func main() {
    for _, v := range url {
        //超时写法
        c := http.Client{
            Transport: &http.Transport{
                Dial: func(network, addr string) (net.Conn, error) {
                    timeout := time.Second * 2
                    return net.DialTimeout(network, addr, timeout)
                },
            },
        }
        resp, err := c.Head(v)
        if err != nil {
            fmt.Printf("head %s failed,err:%v\n", v, err)
            continue
        }
        fmt.Printf("head succ,status:%v\n", resp.Status)
    }
}

 http_form写法



package main

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

const form = `<html><body><form action="#" method="post" name="bar">
               <input type="text" name="in"/>
               <input type="text" name="in"/>
               <input type="submit" value="Submit"/>
         </form></body></html>`

func SimpleServer(w http.ResponseWriter, request *http.Request) {
   io.WriteString(w, "hello,world")
   panic("test test")
}
func FormServer(w http.ResponseWriter, request *http.Request) {
   w.Header().Set("Content-Type", "text/html")
   switch request.Method {
   case "GET":
      io.WriteString(w, form)
   case "POST":
      request.ParseForm()
      io.WriteString(w, request.Form["in"][1])
      io.WriteString(w, "\n")
      io.WriteString(w, request.FormValue("in"))
   }
}

func main() {
   //用函数封装了一下
   http.HandleFunc("/test1", logPanics(SimpleServer))
   http.HandleFunc("/test2", logPanics(FormServer))
   if err := http.ListenAndServe(":8088", nil); err != nil {
   }
}
//捕获，错误处理
func logPanics(handle http.HandlerFunc) http.HandlerFunc {
   return func(write http.ResponseWriter, request *http.Request) {
      defer func() {
         if x := recover(); x != nil {
            log.Printf("[%v]caught panic:%v", request.RemoteAddr, x)
         }
      }()
      handle(write, request) //这里才是
   }
}


 




http_template，模板写法




package main

import (
    "fmt"
    "os"
    "text/template"
)

type Person struct {
    Name  string
    age   string
    Title string
}

func main() {
    t, err := template.ParseFiles("d:/project/src/go_dev/day10/http_form/index.html")
    if err != nil {
        fmt.Println("parse file err:", err)
        return
    }
    p := Person{Name: "Mary", age: "31", Title: "我的个人网站"}
    if err := t.Execute(os.Stdout, p); err != nil {
        fmt.Println("There was an error:", err.Error())
    }
}




index.html




<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>{{.Title}}</title>
</head>
<body>
<p>hello,{{.Name}}</p>
<p>{{.}}</p>   
</body>
</html>




用例2：






package main

import (
    "fmt"
    "html/template"
    "io"
    "net/http"
)

var myTemplate *template.Template

type Result struct {
    output string
}

func (p *Result) Write(b []byte) (n int, err error) {
    fmt.Println("called by template")
    p.output += string(b)
    return len(b), nil
}

type Person struct {
    Name  string
    Title string
    Age   int
}

func userInfo(w http.ResponseWriter, r *http.Request) {
    fmt.Println("handle hello")
    //fmt.Fprintf(w,"hello")
    var arr []Person
    p := Person{Name: "Mary001", Age: 10, Title: "我的网站"}
    p1 := Person{Name: "Mary002", Age: 10, Title: "我的个人网站"}
    p2 := Person{Name: "Mary003", Age: 10, Title: "我的网站2"}
    arr = append(arr, p)
    arr = append(arr, p1)
    arr = append(arr, p2)

    resultWriter := &Result{}
    io.WriteString(resultWriter, "hello world")
    err := myTemplate.Execute(w, arr)
    if err != nil {
        fmt.Println(err)
    }
    fmt.Println("template render data:", resultWriter.output)
    //myTemplate.Execute(w, p)
    //myTemplate.Execute(os.Stdout, p)
    //file, err := os.OpenFile("C:/test.log", os.O_CREATE|os.O_WRONLY, 0755)
    //if err != nil {
    //    fmt.Println("open failed err:", err)
    //    return
    //}
}
func initTemplate(filename string) (err error) {
    myTemplate, err = template.ParseFiles(filename)
    if err != nil {
        fmt.Println("parse file err:", err)
        return
    }
    return
}
func main() {
    initTemplate("d:/project/src/go_dev/day10/template_http/index.html")
    http.HandleFunc("/user/info", userInfo)
    err := http.ListenAndServe("127.0.0.1:8880", nil)
    if err != nil {
        fmt.Println("http listen failed")
    }
}



template.go






<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
</head>
<body>
<p>hello world</p>
<table border="1">
{{range .}}
    <tr>
        <td>{{.Name}}</td> <td>{{.Age}}</td><td>{{.Title}}</td>
    </tr>
{{end}}
</table>
</body>
</html>



index.html


 







            

            
posted @ 
2018-01-24 23:48 
py鱼 
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