golang 上传，下载图片

 

package main;
import (
    "fmt"
    "io"
    "io/ioutil"
    "os"
    "path"
    "net/http"
    "errors"
    "strings"
)
 
func main() {
    http.HandleFunc("/upload/", uploadHandle) // 上传
    http.HandleFunc("/uploaded/", showPicHandle)  //显示图片
    err := http.ListenAndServe("0.0.0.0:4400", nil)
    fmt.Println(err)
}
 
// 上传图像接口
func uploadHandle (w http.ResponseWriter, req *http.Request) {
    w.Header().Set("Content-Type", "text/html")
 
    req.ParseForm()
    if req.Method != "POST" {
        w.Write([]byte(html))
    } else {
        // 接收图片
        uploadFile, handle, err := req.FormFile("image")
        errorHandle(err, w)
 
        // 检查图片后缀
        ext := strings.ToLower(path.Ext(handle.Filename))
        if ext != ".jpg" && ext != ".png" {
            errorHandle(errors.New("只支持jpg/png图片上传"), w);
            return
            //defer os.Exit(2)
        }
 
        // 保存图片
        os.Mkdir("./uploaded/", 0777)
        saveFile, err := os.OpenFile("./uploaded/" + handle.Filename, os.O_WRONLY|os.O_CREATE, 0666);
        errorHandle(err, w)
        io.Copy(saveFile, uploadFile);
 
        defer uploadFile.Close()
        defer saveFile.Close()
        // 上传图片成功
        w.Write([]byte("查看上传图片: " + handle.Filename + ""));
    }
}
 
// 显示图片接口
func showPicHandle( w http.ResponseWriter, req *http.Request ) {
    file, err := os.Open("." + req.URL.Path)
    errorHandle(err, w);
 
    defer file.Close()
    buff, err := ioutil.ReadAll(file)
    errorHandle(err, w);
    w.Write(buff)
}
 
// 统一错误输出接口
func errorHandle(err error, w http.ResponseWriter) {
    if  err != nil {
        w.Write([]byte(err.Error()))
    }
}
 
const html = `
    
    
        

            
            
        
    
`

本文转自：https://aiezu.com/article/go_image_upload_and_show.html

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