我正在开发 debian stable linux，它运行得很好。我有一个简单的 web 应用程序的以下目录结构，该应用程序从用户处获取 2 个数字并返回这 2 个数字的乘积：
.
├── ./main
├── ./main.go
└── ./static
├── ./static/favicon.ico
├── ./static/index.html
└── ./static/style.css
我有以下 go 代码：
package main
import (
"fmt"
"html/template"
"log"
"net/http"
"strconv"
)
type viewdata struct {
product int
}
func multiplyhandler(w http.responsewriter, r *http.request) {
err := r.parseform()
if err != nil {
http.error(w, "error parsing form", http.statusbadrequest)
return
}
num1, err := strconv.atoi(r.form.get("num1"))
if err != nil {
http.error(w, "invalid input for num1", http.statusbadrequest)
return
}
num2, err := strconv.atoi(r.form.get("num2"))
if err != nil {
http.error(w, "invalid input for num2", http.statusbadrequest)
return
}
product := num1 * num2
data := viewdata{
product: product,
}
tmpl, err := template.parsefiles("index.html")
if err != nil {
http.error(w, "error parsing template", http.statusinternalservererror)
return
}
err = tmpl.execute(w, data)
if err != nil {
http.error(w, "error rendering template", http.statusinternalservererror)
return
}
}
func main() {
http.handle("/static/", http.stripprefix("/static/", http.fileserver(http.dir("./static"))))
http.handlefunc("/multiply", multiplyhandler)
fmt.println("server listening on port 8080")
log.fatal(http.listenandserve(":8080", nil))
}
以下是index.html文件：
<!doctype html>
<html>
<head>
<title>multiplication result</title>
<link rel="stylesheet" type="text/css" href="/static/style.css">
</head>
<body>
<h1>multiplication result</h1>
<p>product: {{.product}}</p>
</body>
</html>
以下是 style.css 文件：
body {
font-family: arial, sans-serif;
background-color: #f5f5f5;
margin: 0;
padding: 20px;
}
h1 {
color: #333;
}
p {
color: #666;
font-size: 18px;
margin-bottom: 10px;
}
go 源代码文件 main.go 构建时没有任何警告或错误消息。
然后我使用命令运行它：./main。以下是消息内容：
server listening on port 8080
然后我打开 firefox 浏览器并输入 url: http://localhost:8080 。然而，网页只显示：
404 page not found
问题出在哪里，如何解决？
以下是对代码的更改（第二个更改不是必需的，但它简化了代码）：
（注意：更改以 diff 格式显示。但不幸的是，这不是 stackoverflow 突出显示的语法）
package main
import (
"fmt"
"html/template"
"log"
"net/http"
"strconv"
)
type viewdata struct {
product int
}
func multiplyhandler(w http.responsewriter, r *http.request) {
err := r.parseform()
if err != nil {
http.error(w, "error parsing form", http.statusbadrequest)
return
}
num1, err := strconv.atoi(r.form.get("num1"))
if err != nil {
http.error(w, "invalid input for num1", http.statusbadrequest)
return
}
num2, err := strconv.atoi(r.form.get("num2"))
if err != nil {
http.error(w, "invalid input for num2", http.statusbadrequest)
return
}
product := num1 * num2
data := viewdata{
product: product,
}
- tmpl, err := template.parsefiles("index.html")
+ tmpl, err := template.parsefiles("static/index.html")
if err != nil {
http.error(w, "error parsing template", http.statusinternalservererror)
return
}
err = tmpl.execute(w, data)
if err != nil {
http.error(w, "error rendering template", http.statusinternalservererror)
return
}
}
func main() {
- http.handle("/static/", http.stripprefix("/static/", http.fileserver(http.dir("./static"))))
+ http.handle("/static/", http.fileserver(http.dir(".")))
http.handlefunc("/multiply", multiplyhandler)
fmt.println("server listening on port 8080")
log.fatal(http.listenandserve(":8080", nil))
}
然后在浏览器中打开此网址（提供所需参数num1和num2）：
http://localhost:8080/multiply?num1=5&num2=10
