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

GITHUB网址:

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

内容

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)
}

  

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

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