In the era of the Internet, data has become a very important resource. Therefore, how to store and manage data has become particularly important. For most web applications, file uploading and downloading, management and storage are indispensable functions. This article will introduce how to use the Go language and the Gin framework to implement a set of simple and easy-to-use file management and storage functions.
1. Pre-requisite technology and basic knowledge
Before we start, we need to master some basic technologies and knowledge. First, we need to be familiar with the basic syntax and web development model of Go language. If you are not familiar with the Go language yet, you can refer to the tutorials on the Golang official website to learn. At the same time, we also need to master the basic usage of the Gin framework. Gin is a high-performance web framework that is easy to learn and use, fast and has clear routing. If you are not familiar with the Gin framework yet, you can first read its official documentation to learn.
2. Implementation Ideas
The goal of this article is to implement a set of simple and easy-to-use file management and storage functions, including the following basic functions:
For these functions, we You can consider using Go language and Gin framework for implementation. The specific implementation ideas are as follows:
File upload and download are commonly used functions in Web development. For file upload, we can use standard HTML forms and input elements; for file download, we can use the GET method in the HTTP protocol. The specific implementation steps are as follows:
(1) Add a file upload form to the front-end page so that users can select local files and upload the files to the server.
(2) In the back-end code, use the Bind method provided by the Gin framework to obtain the uploaded file and save it to the local file system. Also, to prevent file name conflicts, a unique file name can be generated for each uploaded file.
(3) For file downloads, we can display the uploaded file list on the front-end page and provide a download link for each file.
(4) In the back-end code, use the StaticServe method provided by the Gin framework to map the file download link to the corresponding file in the local file system.
After the file is uploaded, we need to save the uploaded file to the local file system and add it to the file list. For users to view and operate. The specific implementation steps are as follows:
(1) Display the uploaded file list on the front-end page, and provide viewing and editing links for each file.
(2) In the back-end code, use the routing function provided by the Gin framework to map the file list to an HTTP request processor.
(3) In the HTTP request processor, we need to read all files from the local file system and add them to a file list. Return the file list to the front-end page in JSON format. At the same time, we also need to add viewing and editing links to each file.
After the user has uploaded the file, the file may need to be deleted or modified. File deletion and modification is a relatively easy function to implement. The specific implementation steps are as follows:
(1) Add delete and edit buttons for each file in the front-end page. Users can click these buttons to delete and modify files. Modify the file.
(2) In the back-end code, use the routing function provided by the Gin framework to map file deletion and modification requests to different HTTP request processors. In the processor, we need to implement deletion and modification operations on files. For deletion operations, we need to delete the corresponding files from the local file system; for modification operations, we need to save the modified files to the local file system and update the corresponding information in the file list.
In actual applications, files may need to be organized into different folders. The creation and deletion of folders can be achieved in a manner similar to the file deletion and modification methods. The specific implementation steps are as follows:
(1) Provide users with buttons and forms for creating and deleting folders on the front-end page.
(2) In the back-end code, use the routing function provided by the Gin framework to map requests to create and delete folders to different HTTP request processors. In the processor, we need to implement the creation and deletion of folders. For creation operations, we need to create a new directory in the local file system and update the corresponding information in the file list; for deletion operations, we need to delete the corresponding directory and all files in it in the local file system and update the files Corresponding information in the list.
3. Implementation code
Finally, let’s take a look at the specific code on how to use the Go language and the Gin framework to implement file management and storage functions.
package main
import (
"github.com/gin-gonic/gin"
"io/ioutil"
"net/http"
"os"
"strconv"
)
type File struct {
Name string `json:"name"`
Size int64 `json:"size"`
}
type Folder struct {
Name string `json:"name"`
Files []File `json:"files"`
Folders []Folder `json:"folders"`
}
func main() {
router := gin.Default()
// 文件上传
router.POST("/upload", func(c *gin.Context) {
file,_ := c.FormFile("file") // 获取上传文件
// 生成唯一文件名
ext := filepath.Ext(file.Filename)
filename := strconv.Itoa(int(time.Now().UnixNano())) + ext
// 将上传的文件保存到本地文件系统中
if err := c.SaveUploadedFile(file, "files/" + filename); err != nil {
c.AbortWithStatus(http.StatusBadRequest)
return
}
c.String(http.StatusOK, filename + " uploaded")
})
// 文件下载
router.Static("/files", "./files")
// 文件列表
router.GET("/files", func(c *gin.Context) {
// 从本地文件系统中读取所有文件
files, err := ioutil.ReadDir("files")
if err != nil {
c.AbortWithStatus(http.StatusBadRequest)
return
}
var fileList []File
for _, file := range files {
fileList = append(fileList, File{Name: file.Name(), Size: file.Size()})
}
c.JSON(http.StatusOK, gin.H{"files": fileList})
})
// 文件删除
router.DELETE("/files/:filename", func(c *gin.Context) {
filename := c.Param("filename")
// 从本地文件系统中删除相应的文件
if err := os.Remove("files/" + filename); err != nil {
c.AbortWithStatus(http.StatusBadRequest)
return
}
c.String(http.StatusOK, filename + " deleted")
})
// 文件夹创建
router.POST("/folders", func(c *gin.Context) {
foldername := c.PostForm("foldername")
// 在本地文件系统中创建一个新的目录
if err := os.Mkdir("files/" + foldername, 0755); err != nil {
c.AbortWithStatus(http.StatusBadRequest)
return
}
c.String(http.StatusOK, foldername + " created")
})
// 文件夹删除
router.DELETE("/folders/:foldername", func(c *gin.Context) {
foldername := c.Param("foldername")
// 在本地文件系统中删除相应的目录和其中的所有文件
if err := os.RemoveAll("files/" + foldername); err != nil {
c.AbortWithStatus(http.StatusBadRequest)
return
}
c.String(http.StatusOK, foldername + " deleted")
})
router.Run(":8080")
}The above code implements functions such as file upload and download, file list display and viewing, file deletion and modification, folder creation and deletion, etc. We can view the effect in the browser by visiting http://localhost:8080.
4. Summary
This article introduces how to use Go language and Gin framework to implement file management and storage functions, including file upload and download, file list display and viewing, file deletion and modification, folder creation and deletion and other common functions. The code in this article is only for demonstration, and more security checks and error handling need to be added in actual applications. We believe that after learning and using the techniques and methods introduced in this article, you can more easily implement a reliable file management and storage system.
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