如何在不使用第三方库的情况下使用Node.js下载文件?
我不需要什么特别的东西。我只想从给定的URL下载文件，然后将其保存到给定的目录。
当前回答
2022年底编辑:
Node v18及以上版本自带自带的Fetch API支持。使用它。
最初的回答:
对于支持承诺的节点，与其他答案相比，一个简单的(部分)Fetch API的Node shim只需要少量额外的代码:
const fs = require(`fs`);
const http = require(`http`);
const https = require(`https`);
module.exports = function fetch(url) {
return new Promise((resolve, reject) => {
const data = [];
const client = url.startsWith("https") ? https : http;
client
.request(url, (res) => {
res.on(`data`, (chunk) => data.push(chunk));
res.on(`end`, () => {
const asBytes = Buffer.concat(data);
const asString = asBytes.toString(`utf8`);
resolve({
arrayBuffer: async () => asBytes,
json: async () => JSON.parse(asString),
text: async () => asString,
});
});
res.on(`error`, (e) => reject(e));
})
.end();
});
};
你可以用它来做任何你需要的事情，使用普通的fetch语法:
const fetch = require(`./tiny-fetch.js`);
fetch(`https://placekitten.com/200/300`)
.then(res => res.arrayBuffer())
.then(bytes => fs.writeFileSync(`kitten.jpg`, bytes))
.catch(e => console.error(e));
fetch(`https://jsonplaceholder.typicode.com/todos/1`)
.then(res => res.json())
.then(obj => console.log(obj))
.catch(e => console.error(e));
// etc.
其他回答
我建议你使用res.download，如下:
app.get('/download', function(req, res){
const file = `${__dirname}/folder/abc.csv`;
res.download(file); // Set disposition and send it.
});
2022年底编辑:
Node v18及以上版本自带自带的Fetch API支持。使用它。
最初的回答:
对于支持承诺的节点，与其他答案相比，一个简单的(部分)Fetch API的Node shim只需要少量额外的代码:
const fs = require(`fs`);
const http = require(`http`);
const https = require(`https`);
module.exports = function fetch(url) {
return new Promise((resolve, reject) => {
const data = [];
const client = url.startsWith("https") ? https : http;
client
.request(url, (res) => {
res.on(`data`, (chunk) => data.push(chunk));
res.on(`end`, () => {
const asBytes = Buffer.concat(data);
const asString = asBytes.toString(`utf8`);
resolve({
arrayBuffer: async () => asBytes,
json: async () => JSON.parse(asString),
text: async () => asString,
});
});
res.on(`error`, (e) => reject(e));
})
.end();
});
};
你可以用它来做任何你需要的事情，使用普通的fetch语法:
const fetch = require(`./tiny-fetch.js`);
fetch(`https://placekitten.com/200/300`)
.then(res => res.arrayBuffer())
.then(bytes => fs.writeFileSync(`kitten.jpg`, bytes))
.catch(e => console.error(e));
fetch(`https://jsonplaceholder.typicode.com/todos/1`)
.then(res => res.json())
.then(obj => console.log(obj))
.catch(e => console.error(e));
// etc.
function download(url, dest, cb) {
var request = http.get(url, function (response) {
const settings = {
flags: 'w',
encoding: 'utf8',
fd: null,
mode: 0o666,
autoClose: true
};
// response.pipe(fs.createWriteStream(dest, settings));
var file = fs.createWriteStream(dest, settings);
response.pipe(file);
file.on('finish', function () {
let okMsg = {
text: `File downloaded successfully`
}
cb(okMsg);
file.end();
});
}).on('error', function (err) { // Handle errors
fs.unlink(dest); // Delete the file async. (But we don't check the result)
let errorMsg = {
text: `Error in file downloadin: ${err.message}`
}
if (cb) cb(errorMsg);
});
};
如果您正在使用express，请使用res.download()方法。否则使用fs模块。
app.get('/read-android', function(req, res) {
var file = "/home/sony/Documents/docs/Android.apk";
res.download(file)
});
(or)
function readApp(req,res) {
var file = req.fileName,
filePath = "/home/sony/Documents/docs/";
fs.exists(filePath, function(exists){
if (exists) {
res.writeHead(200, {
"Content-Type": "application/octet-stream",
"Content-Disposition" : "attachment; filename=" + file});
fs.createReadStream(filePath + file).pipe(res);
} else {
res.writeHead(400, {"Content-Type": "text/plain"});
res.end("ERROR File does NOT Exists.ipa");
}
});
}
您可以尝试使用res.redirect到https文件下载url，然后它将下载文件。
如:res.redirect(“https / / static.file.com/file.txt”);
