Golang图片上传与展示实现教程

<form action="/upload" method="post" enctype="multipart/form-data">
  &lt;input type=&quot;file&quot; name=&quot;image&quot; accept=&quot;image/*&quot; required&gt;
  <button type="submit">上传图片</button>
</form>

func uploadHandler(w http.ResponseWriter, r *http.Request) {
    if r.Method != "POST" {
        http.Error(w, "只支持 POST 请求", http.StatusMethodNotAllowed)
        return
    }

    // 解析 multipart 表单，最大内存 10MB
    r.ParseMultipartForm(10 

os.MkdirAll("uploads", os.ModePerm)

// 将 /images/ 路由指向 uploads 目录
http.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir("uploads/"))))

// 示例访问：http://localhost:8080/images/filename.jpg

func listImages(w http.ResponseWriter, r *http.Request) {
    files, _ := filepath.Glob("uploads/*")
    var imageLinks string
    for _, f := range files {
        filename := filepath.Base(f)
        imageLinks += fmt.Sprintf("<img src='/images/%s' width='200' style='margin:10px;'>", filename)
    }
    fmt.Fprintf(w, "<h3>已上传图片</h3>%s", imageLinks)
}

package main

import (
    "fmt"
    "io"
    "net/http"
    "os"
    "path/filepath"
)

func main() {
    os.MkdirAll("uploads", os.ModePerm)

    http.HandleFunc("/upload", uploadHandler)
    http.HandleFunc("/images", listImages)
    http.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir("uploads/"))))

    fmt.Println("服务器启动在 :8080")
    http.ListenAndServe(":8080", nil)
}