GO学习笔记7-构件WEB服务器-原创手记-慕课网

package main

import (
"crypto/md5"
"fmt"
"html/template"
"io"
"log"
"net/http"
"regexp"
"strconv"
"strings"
"time"
)

//登录方法
func login(w http.ResponseWriter, r *http.Request) {

r.ParseForm() //将表单提交的数据格式化，很重要
//得到页面
if r.Method == "GET" {

    crutime := time.Now().Unix()
    h := md5.New()
    io.WriteString(h, strconv.FormatInt(crutime, 10))
    token := fmt.Sprintf("%x", h.Sum(nil))
    t, _ := template.ParseFiles("test.html")
    t.Execute(w, token) //token作为参数，传递到前台的Name为token的对象
} else {
    //post方法，提交表单数据
    fmt.Println("参数:", r.Form)
    name := strings.Join(r.Form["username"], "")
    psd := strings.Join(r.Form["password"], "")
    //通过Token，验证唯一性
    token := r.Form.Get("token")
    if token != "" {
        if name == "AAA" && psd == "123456" {
            fmt.Println("1111")
        }
        //后台验证表单输入
        if len(name) > 4 { //len()==0//判断空值，必填项验证常使用
            fmt.Println("长度超过4")
        }
        //判断数字
        getint, err := strconv.Atoi(psd)
        if err != nil {
            fmt.Println("转化为数字失败！")
        }
        if getint > 123456 {
            fmt.Println("数字不正确！")
        }
        //使用正则表达式
        if m, _ := regexp.MatchString("^[0-9]+$", psd); !m {
            fmt.Println("不是数字！")
        }
        //下拉列表的验证
        slice := []string{"apple", "pear", "banane"}
        for _, v := range slice {
            if v == r.Form.Get("fruit") {
                fmt.Println(v)
            }
        }

        //单选按钮
        sex := r.Form.Get("gender")
        if sex == "1" {
            fmt.Println("男")
        } else if sex == "2" {
            fmt.Println("女")
        }

        //复选框
        a := r.FormValue("interest") //默认得到第一个值，即r.FormValue("interest")==r.Form["interest"][0]
        fmt.Println(a)

        b := strings.Join(r.Form["interest"], ",")
        fmt.Println(b)

        c := r.Form["interest"][0] //得到第一个值
        fmt.Println(c)

        //时间的处理
        d := r.FormValue("datetime")
        fmt.Println("时间1：", d)
        shijian := strings.Split(d, "-")
        fmt.Println("时间2：", shijian)
        fmt.Println("年:", shijian[0], ",月:", shijian[1], ",日:", shijian[2])
        /***********************
        #string到int
        int,err:=strconv.Atoi(string)
        #string到int64
        int64, err := strconv.ParseInt(string, 10, 64)
        #int到string
        string:=strconv.Itoa(int)
        #int64到string
        string:=strconv.FormatInt(int64,10)
        ***********************/
        nian := shijian[0]
        yue := shijian[1]
        tian := shijian[2]

        year1, err := strconv.Atoi(nian)
        if err != nil {
            fmt.Println("获取年失败！")
        } else {
            fmt.Println("年:", year1)
        }
        month1, err := strconv.Atoi(yue)
        if err != nil {
            fmt.Println("获取月失败！")
        } else {
            fmt.Println("月:", month1)
        }
        day1, err := strconv.Atoi(tian)
        if err != nil {
            fmt.Println("获取天失败！")
        } else {
            fmt.Println("日:", day1)
        }
        t := time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC)
        fmt.Println("时间格式3：", t)

        //测试函数，得到月份的英文
        yuefen := getMonth(month1)
        fmt.Println(month1, "月的英文是:", yuefen)

        //身份证验证
        if m, _ := regexp.MatchString(`^([1-8])(\d{16})([0-9]|X)$`, r.Form.Get("usercard")); !m {
            fmt.Println(r.Form.Get("usercard"), "错误!")
        } else {
            fmt.Println(r.Form.Get("usercard"), "正确!")
        }

        //转义，预防跨站脚本
        fmt.Println("menu1:", template.HTMLEscapeString(r.Form.Get("menu"))) //输出到服务器端
        fmt.Println("menu2:", template.HTMLEscapeString(r.Form.Get("menu")))
        template.HTMLEscape(w, []byte(r.Form.Get("menu"))) //输出到客户端
    }
}

}

//跳转到此页面
func gotoHome(w http.ResponseWriter, r *http.Request) {
//得到页面
if r.Method == "GET" {
t, _ := template.ParseFiles("goto.html")
t.Execute(w, nil)
} else {
testval := r.FormValue("val")
fmt.Println(testval)
}
}

//主函数
func main() {
http.HandleFunc("/", gotoHome) //设置访问的路由
http.HandleFunc("/login", login) //设置访问的路由
err := http.ListenAndServe(":9090", nil)
if err != nil {
log.Fatal("ListenAndServe:", err)
} else {
log.Fatal("登录成功！")
}
}

//根据值，得到月份

func getMonth(no int) string {
var yuefen string
switch no {
case 1:
yuefen = "January"
break
case 2:
yuefen = "February"
break
case 3:
yuefen = "March"
break
case 4:
yuefen = "April"
break
case 5:
yuefen = "May"
break
case 6:
yuefen = "June"
break
case 7:
yuefen = "July"
break
case 8:
yuefen = "August"
break
case 9:
yuefen = "September"
break
case 10:
yuefen = "October"
break
case 11:
yuefen = "November"
break
case 12:
yuefen = "December"
break
default:
/*****
获取当前时间的年月日
year:=time.Now().Year()
month:=time.Now().Month()//time.Now().Month().String()
day:=time.Now().Day()
**/
yuefen = time.Now().Month().String()
break
}

return yuefen

}
2-》前台页面（test.html和goto.html）
test.html页面主要做的是表单的验证，获取值等操作
<!Doctype html>
<html>
<head>
<title>测试调用后台程序</title>
</head>
<body>
<form action="http://127.0.0.1:9090/login" method="post">
<label>用户名:</label><input type="text" placeholder="请输入用户名" name="username"/>
<label>密码:</label><input type="password" name="password"/>
<label>下拉表：</label>
<select name="fruit">
<option value="apple">apple</option>
<option value="pear">pear</option>
<option value="banane">banane</option>
</select>
<label>单选:</label>
<input type="radio" name="gender" value="1" checked="checked">男
<input type="radio" name="gender" value="2">女
<label>复选框:</label>
<input type="checkbox" name="interest" value="football">足球
<input type="checkbox" name="interest" value="basketball">篮球
<input type="checkbox" name="interest" value="tennis">网球
<label>时间:</label>
<input type="text" name="datetime"/>
<br/>
<label>身份证:</label>
<input type="text" name="usercard"/>

Goto.html页面主要做为刚开始测试页面
<!DocType html>
<html>
<head>
<title>跳转页面</title>

</head>
<body>
<form action="http://127.0.0.1:9090/" method="post">
<input name="val" placeholder="请输入值:"/>
<button type="sumbit" value="返回">返回</button>
</form>
</body>
</html>