您的位置：首页 > 移动开发

学习build-web-application-with-golang第四章内容

2017-09-07 15:24 274 查看

GITHUB网址：
https://github.com/astaxie/build-web-application-with-golang
内容

4.表单

4.1 处理表单的输入

4.2 验证表单的输入

4.3 预防跨站脚本

4.4 防止多次递交表单

4.5 处理文件上传

4.6 小结

login.gtpl

<html>
<head>
<title>
hello, go form
</title>
</head>
<body>
<form action="/login" method="post">
<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
username:<input type="text" name="username">
age:<input type="text" name="age">
password:<input type="password" name="password">
<input type="hidden" name="token" value="{{.}}">
<input type="submit" value="login">
</form>
</body>
</html>

　　upload.gtpl

<html>
<head>
<title>
hello, go upload
</title>
</head>
<body>
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="file" name="uploadfile" />

<input type="hidden" name="token" value="{{.}}">
<input type="submit" value="upload">
</form>
</body>
</html>

　　go.main

package main

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

func sayHelloName(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
fmt.Println(r.Form)
fmt.Println("path", r.URL.Path)
fmt.Println("scheme", r.URL.Scheme)
fmt.Println(r.Form["url_long"])
for k, v := range r.Form {
fmt.Println("key: ", k)
fmt.Println("val: ", strings.Join(v, ""))
}
fmt.Fprintf(w, "Hello astaxie!")
}

func login(w http.ResponseWriter, r *http.Request) {
fmt.Println("method: ", r.Method)
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("login.gtpl")
t.Execute(w, token)
log.Println(t.Execute(w, nil))
} else {
r.ParseForm()
token := r.Form.Get("token")
if token != "" {
log.Printf("token is ok")
} else {
log.Fatal("no token")
}
fmt.Println("username: ", template.HTMLEscapeString(r.Form.Get("username")))
fmt.Println("password:", r.Form["password"])
fmt.Println("token:", r.Form["token"])
age, err := strconv.Atoi(r.Form.Get("age"))
if err != nil {
log.Print(err)
}
if age > 100 {
log.Print("too long")
} else {
fmt.Println("age:", r.Form["age"])
}

template.HTMLEscape(w, []byte(r.Form.Get("username")))

}
}

func upload(w http.ResponseWriter, r *http.Request) {
fmt.Println("method:", r.Method)
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("upload.gtpl")
t.Execute(w, token)
} else {
r.ParseMultipartForm(32 << 20)
file, handler, err := r.FormFile("uploadfile")
if err != nil {
fmt.Println(err)
return
}

defer file.Close()
fmt.Fprintf(w, "%v", handler.Header)
f, err := os.OpenFile("./"+handler.Filename, os.O_WRONLY|os.O_CREATE, 0666)
if err != nil {
fmt.Println(err)
return
}
defer f.Close()
io.Copy(f, file)
}

}

func main() {
http.HandleFunc("/", sayHelloName)
http.HandleFunc("/login", login)
http.HandleFunc("/upload", upload)
err := http.ListenAndServe(":9090", nil)
if err != nil {
log.Fatal(err)
}
}

　　clientupload/main.go

package main

import (
"bytes"
"fmt"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"os"
)

func postFile(filename string, targetUrl string) error {
bodyBuf := &bytes.Buffer{}
bodyWriter := multipart.NewWriter(bodyBuf)

fileWriter, err := bodyWriter.CreateFormFile("uploadfile", filename)
if err != nil {
fmt.Println("error writing to buff")
return err
}
fh, err := os.Open(filename)
if err != nil {
fmt.Println("error opening to buff")
return err
}
defer fh.Close()

_, err = io.Copy(fileWriter, fh)
if err != nil {
fmt.Println("error Copy")
return err
}

contentType := bodyWriter.FormDataContentType()
bodyWriter.Close()

resp, err := http.Post(targetUrl, contentType, bodyBuf)
if err != nil {
fmt.Println("error Post")
return err
}
defer resp.Body.Close()

resp_body, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Println("error ReadAll")
return err
}
fmt.Println(resp.Status)
fmt.Println(string(resp_body))
return nil
}

func main() {
target_url := "http://localhost:9090/upload"
filename := "./bee-1.8.3.tar.gz"
postFile(filename, target_url)
}

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航