gin框架路由-文件上传（单个和多个）

★单个文件上传

multipart/form-data格式用于文件上传
gin文件上传与原生的net/http方法类似，不同在于gin把原生的request封装到c.Request中

html前端代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <form action="http://localhost:8080/upload" method="post" enctype="multipart/form-data">
          上传文件:<input type="file" name="file" >
          <input type="submit" value="提交">
    </form>
</body>
</html>

go后端代码：

package main

import (
    "net/http"

    "github.com/gin-gonic/gin"
)

func main() {
    r := gin.Default()
    //限制上传最大尺寸
    r.MaxMultipartMemory = 8 << 20
    r.POST("/upload", func(c *gin.Context) {
        file, err := c.FormFile("file")
        if err != nil {
            c.String(500, "上传图片出错")
        }
        // c.JSON(200, gin.H{"message": file.Header.Context})
        c.SaveUploadedFile(file, file.Filename)
        c.String(http.StatusOK, file.Filename)
    })
    r.Run()
}

★多个文件上传

html前端代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <form action="http://localhost:8000/upload" method="post" enctype="multipart/form-data">
          上传文件:<input type="file" name="files" multiple>
          <input type="submit" value="提交">
    </form>
</body>
</html>

go后台代码：

package main

import (
    "fmt"
    "net/http"

    "github.com/gin-gonic/gin"
)

// gin的helloWorld

func main() {
    // 1.创建路由
    // 默认使用了2个中间件Logger(), Recovery()
    r := gin.Default()
    // 限制表单上传大小 8MB，默认为32MB
    r.MaxMultipartMemory = 8 << 20
    r.POST("/upload", func(c *gin.Context) {
        form, err := c.MultipartForm()
        if err != nil {
            c.String(http.StatusBadRequest, fmt.Sprintf("get err %s", err.Error()))
        }
        // 获取所有图片
        files := form.File["files"]
        // 遍历所有图片
        for _, file := range files {
            // 逐个存
            if err := c.SaveUploadedFile(file, file.Filename); err != nil {
                c.String(http.StatusBadRequest, fmt.Sprintf("upload err %s", err.Error()))
                return
            }
        }
        c.String(200, fmt.Sprintf("upload ok %d files", len(files)))
    })
    //默认端口号是8080
    r.Run(":8000")
}