golang 上传，下载图片

package main;
import (
    "fmt"
    "io"
    "io/ioutil"
    "os"
    "path"
    "net/http"
    "errors"
    "strings"
)
 
func main() {
    ("/upload/", uploadHandle) // 上传
    ("/uploaded/", showPicHandle)  //显示图片
    err := ("0.0.0.0:4400", nil)
    (err)
}
 
// 上传图像接口
func uploadHandle (w , req *) {
    ().Set("Content-Type", "text/html")
 
    ()
    if  != "POST" {
        ([]byte(html))
    } else {
        // 接收图片
        uploadFile, handle, err := ("image")
        errorHandle(err, w)
 
        // 检查图片后缀
        ext := (())
        if ext != ".jpg" && ext != ".png" {
            errorHandle(("只支持jpg/png图片上传"), w);
            return
            //defer (2)
        }
 
        // 保存图片
        ("./uploaded/", 0777)
        saveFile, err := ("./uploaded/" + , os.O_WRONLY|os.O_CREATE, 0666);
        errorHandle(err, w)
        (saveFile, uploadFile);
 
        defer ()
        defer ()
        // 上传图片成功
        ([]byte("查看上传图片: <a target='_blank' href='/uploaded/" +  + "'>" +  + "</a>"));
    }
}
 
// 显示图片接口
func showPicHandle( w , req * ) {
    file, err := ("." + )
    errorHandle(err, w);
 
    defer ()
    buff, err := (file)
    errorHandle(err, w);
    (buff)
}
 
// 统一错误输出接口
func errorHandle(err error, w ) {
    if  err != nil {
        ([]byte(()))
    }
}
 
const html = `<html>
    <head></head>
    <body>
        <form method="post" enctype="multipart/form-data">
            <input type="file" name="image" />
            <input type="submit" />
        </form>
    </body>
</html>`
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golang 上传，下载图片

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