英文:
Use <img> tag in Go to display local image
问题
我该如何使用<img>标签在Go中显示本地图片？
我尝试了以下代码：
fmt.Fprintf(w, "</br><img src='" + path.Join(rootdir, fileName) + "' ></img>")
其中rootdir = os.Getwd()，fileName是文件名。
如果我使用相同的路径尝试http.ServeFile，我可以下载图片，但是我想将其嵌入到网页中。
英文:
How can I use the <img> tag to display a local image in Go?
I've tried the following:
fmt.Fprintf(w, "</br><img src='" + path.Join(rootdir, fileName) + "' ></img>")
where rootdir = os.Getwd() and fileName is the name of the file.
If I try http.ServeFile with the same path then I can download the image, however I would like to embed it in the webpage itself.
答案1
得分: 8
我将在这里陈述一下，我对Go的了解非常糟糕，但我做过一些实验，其中涉及到了这一点，所以也许这至少能指导你朝正确的方向前进。基本上，下面的代码使用一个处理器来处理/images/下的任何内容，该处理器从根目录中的images文件夹中提供文件（在我的情况下是/home/username/go）。然后，你可以在<img>标签中硬编码/images/，或者像之前一样使用path.Join()，将images作为第一个参数。
package main
import (
"fmt"
"net/http"
"os"
"path"
)
func handler(w http.ResponseWriter, r *http.Request) {
fileName := "testfile.jpg"
fmt.Fprintf(w, "<html></br><img src='/images/" + fileName + "' ></html>")
}
func main() {
rootdir, err := os.Getwd()
if err != nil {
rootdir = "No dice"
}
// 处理指向 /images/ 的任何内容
http.Handle("/images/", http.StripPrefix("/images",
http.FileServer(http.Dir(path.Join(rootdir, "images/"))))))
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)
}
英文:
I'll preface this by saying my Go knowledge is atrocious at best, but the few experiments I've done have involved this a bit, so maybe this will at least point you in the right direction. Basically, the below code uses a Handle for anything under /images/ that serves files from the images folder in your root directory (in my case it was /home/username/go). You can then either hardcode /images/ in your <img> tag, or use path.Join() as you did before, making images the first argument.
package main
import (
"fmt"
"net/http"
"os"
"path"
)
func handler(w http.ResponseWriter, r *http.Request) {
fileName := "testfile.jpg"
fmt.Fprintf(w, "<html></br><img src='/images/" + fileName + "' ></html>")
}
func main() {
rootdir, err := os.Getwd()
if err != nil {
rootdir = "No dice"
}
// Handler for anything pointing to /images/
http.Handle("/images/", http.StripPrefix("/images",
http.FileServer(http.Dir(path.Join(rootdir, "images/")))))
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)
}
答案2
得分: 2
也许你可以使用data URI。
英文:
Maybe you could use a data URI.
答案3
得分: 0
这对我有用：
package main
import (
"io"
"net/http"
"os"
)
func index(w http.ResponseWriter, r *http.Request) {
f, e := os.Open(r.URL.Path[1:])
if e != nil {
panic(e)
}
defer f.Close()
io.Copy(w, f)
}
func main() {
http.HandleFunc("/", index)
new(http.Server).ListenAndServe()
}
英文:
This worked for me:
package main
import (
"io"
"net/http"
"os"
)
func index(w http.ResponseWriter, r *http.Request) {
f, e := os.Open(r.URL.Path[1:])
if e != nil {
panic(e)
}
defer f.Close()
io.Copy(w, f)
}
func main() {
http.HandleFunc("/", index)
new(http.Server).ListenAndServe()
}
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