koa2文件的上传下载功能

const Router = require("koa-router");

const upload = new Router();

const bodyParser = require("koa-bodyparser");

const multer = require("@koa/multer");

const path = require("path");

const article = require(".../utils/sql");

const { getCurrentTime } = require(".../utils/times");

upload.use(bodyParser());

const storage = multer.diskStorage({

destination: function (req, file, cb) {

const uploadPath = path.join(__dirname, ".../uploads");

cb(null, uploadPath);

},

filename: function (req, file, cb) {

cb(null, file.originalname);

},

});

const uploadFile = multer({ storage: storage });

upload.post("/upload", uploadFile.single("file"), async (ctx) => {

const created_at = getCurrentTime();

const { userId, name, type, size, folderId } = ctx.request.body;

const user_id = userId;

const filename = name;

const folder_id = folderId;

const filePath = path.join(

__dirname,

".../uploads",

ctx.request.file.filename

);

const relativeFilePath = path.relative(

path.join(__dirname, ".../uploads"),

filePath

);

let data = await article.addFile(

user_id,

filename,

size,

folder_id,

type,

created_at,

relativeFilePath

);

ctx.body = {

code: 200,

msg: "创建成功",

data,

};

});

module.exports = upload;

下载功能

const Router = require("koa-router");

const download = new Router();

const bodyParser = require("koa-bodyparser");

download.use(bodyParser());

const article = require(".../utils/sql");

const path = require("path");

const send = require("koa-send"); // 引入 koa-send

const static = require("koa-static"); // 引入 koa-static

download.use(static(path.join(__dirname, ".../uploads")));

download.post("/download", async (ctx) => {

let data = ctx.request.body;

const { id } = data;

let res = await article.downloadFile(id);

if (res.data && res.data.length > 0) {

const file = res.data[0];

const filePath = file.relativeFilePath; // 确保这是文件在服务器上的完整路径

console.log(filePath)

await send(ctx, filePath, { root: path.join(__dirname, ".../uploads/") });

} else {

ctx.body = {

code: 404,

msg: "文件未找到",

};

}

});

module.exports = download;

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