nodejs实现文件下载
遇到个问题，由于和后端对接一个下载功能，第一次做不大会，所以使用了隐藏的form表单进行使用，成功下载，后来越想越不对。自己琢磨下，有了这篇博客????
<!doctype html>
<html >
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#download {
cursor: pointer;
}
</style>
<script src="./axios2.js"></script>
</head>
<body>
<a >点我下载</a>
</body>
<script>
const btn = document.querySelector('#download');
btn.addEventListener('click', function (e) {
axios({
url: 'http://localhost:8086/getFile?filename=test.txt',
responseType: 'blob',
method: 'get',
}).then(function (response) {
// handle success
console.log(response);
})
.catch(function (error) {
// handle error
console.log(error);
})
.finally(function () {
// always executed
});
});
</script>
</html>
//download.js
const http = require('http');
const url = require('url');
const fs = require('fs');
const path = require('path');
const server = http.createServer((req, res) => {
const {pathname, query} = url.parse(req.url);
const urlStr = url.parse(req.url);
if (pathname === '/getFile') {
const queryObj = {};
if (query.length) {
const queryArr = query.split('&');
queryArr.forEach((e, i) => {
let oneQuery = e.split('=');
let key = oneQuery[0];
let value = oneQuery[1];
queryObj[key] = value;
});
}
const keys = Object.keys(queryObj);
let data;
keys.forEach(function (key) {
if (key === 'filename') {
let filepath = path.resolve(__dirname, queryObj[key]);
console.log(filepath);
fs.readFile(filepath, (err, data) => {
console.log('data....');
if (err) {
res.end(err);
return;
}
res.writeHead(200, {
'Content-Disposition': 'attachment; filename=' + queryObj[key],
'content-type': 'application/octet-stream',
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Headers': 'X-Requested-With',
'Access-Control-Allow-Methods': 'PUT,POST,GET,DELETE,OPTIONS',
});
fs.createReadStream(filepath).pipe(res);
});
}
});
}
});
server.listen(8086);
未完待续.
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