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Echo

文件上传

Echo 通过请求上下文读取 multipart 表单数据。文本字段使用 c.FormValue，单个文件使用 c.FormFile，要访问同一字段名下的多个文件则使用 c.MultipartForm。

上传带字段的单个文件

Section titled “上传带字段的单个文件”

服务器

Section titled “服务器”
package main


import (
  "context"
  "fmt"
  "io"
  "net/http"
  "os"


  "github.com/labstack/echo/v5"
  "github.com/labstack/echo/v5/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.RequestLogger())
  e.Use(middleware.Recover())


  e.Static("/", "public")
  e.POST("/upload", upload)


  sc := echo.StartConfig{Address: ":1323"}
  if err := sc.Start(context.Background(), e); err != nil {
    e.Logger.Error("failed to start server", "error", err)
  }
}

客户端

Section titled “客户端”
<!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>

上传带字段的多个文件

Section titled “上传带字段的多个文件”

服务器

Section titled “服务器”
package main


import (
  "context"
  "fmt"
  "io"
  "net/http"
  "os"


  "github.com/labstack/echo/v5"
  "github.com/labstack/echo/v5/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.RequestLogger())
  e.Use(middleware.Recover())


  e.Static("/", "public")
  e.POST("/upload", upload)


  sc := echo.StartConfig{Address: ":1323"}
  if err := sc.Start(context.Background(), e); err != nil {
    e.Logger.Error("failed to start server", "error", err)
  }
}

客户端

Section titled “客户端”
<!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>