文件上传

文件上传
- 上传单个文件
  - 服务端
  - 客户端
- 上传多个文件
  - 服务端
  - 客户端

title: File Upload url: /cookbook/file-upload menu: side: name: 文件上传 parent: cookbook

weight: 12

上传单个文件

服务端

server.go

package main
import (
    "fmt"
    "io"
    "os"
    "net/http"
    "github.com/labstack/echo"
    "github.com/labstack/echo/middleware"
)
func upload(c echo.Context) error {
    // Read form fields
    name := c.FormValue("name")
    email := c.FormValue("email")
    //-----------
    // Read file
    //-----------
    // Source
    file, err := c.FormFile("file")
    if err != nil {
        return err
    }
    src, err := file.Open()
    if err != nil {
        return err
    }
    defer src.Close()
    // Destination
    dst, err := os.Create(file.Filename)
    if err != nil {
        return err
    }
    defer dst.Close()
    // Copy
    if _, err = io.Copy(dst, src); err != nil {
        return err
    }
    return c.HTML(http.StatusOK, fmt.Sprintf("<p>File %s uploaded successfully with fields name=%s and email=%s.</p>", file.Filename, name, email))
}
func main() {
    e := echo.New()
    e.Use(middleware.Logger())
    e.Use(middleware.Recover())
    e.Static("/", "public")
    e.POST("/upload", upload)
    e.Logger.Fatal(e.Start(":1323"))
}

客户端

index.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Single file upload</title>
</head>
<body>
<h1>Upload single file with fields</h1>
<form action="/upload" method="post" enctype="multipart/form-data">
    Name: <input type="text" name="name"><br>
    Email: <input type="email" name="email"><br>
    Files: <input type="file" name="file"><br><br>
    <input type="submit" value="Submit">
</form>
</body>
</html>

上传多个文件

服务端

server.go

package main
import (
    "fmt"
    "io"
    "os"
    "net/http"
    "github.com/labstack/echo"
    "github.com/labstack/echo/middleware"
)
func upload(c echo.Context) error {
    // Read form fields
    name := c.FormValue("name")
    email := c.FormValue("email")
    //------------
    // Read files
    //------------
    // Multipart form
    form, err := c.MultipartForm()
    if err != nil {
        return err
    }
    files := form.File["files"]
    for _, file := range files {
        // Source
        src, err := file.Open()
        if err != nil {
            return err
        }
        defer src.Close()
        // Destination
        dst, err := os.Create(file.Filename)
        if err != nil {
            return err
        }
        defer dst.Close()
        // Copy
        if _, err = io.Copy(dst, src); err != nil {
            return err
        }
    }
    return c.HTML(http.StatusOK, fmt.Sprintf("<p>Uploaded successfully %d files with fields name=%s and email=%s.</p>", len(files), name, email))
}
func main() {
    e := echo.New()
    e.Use(middleware.Logger())
    e.Use(middleware.Recover())
    e.Static("/", "public")
    e.POST("/upload", upload)
    e.Logger.Fatal(e.Start(":1323"))
}

客户端

index.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Multiple file upload</title>
</head>
<body>
<h1>Upload multiple files with fields</h1>
<form action="/upload" method="post" enctype="multipart/form-data">
    Name: <input type="text" name="name"><br>
    Email: <input type="email" name="email"><br>
    Files: <input type="file" name="files" multiple><br><br>
    <input type="submit" value="Submit">
</form>
</body>
</html>