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
var requestModule=require("request");
requestModule(filePath).pipe(fs.createWriteStream('abc.zip'));
其他回答
Vince Yuan的代码很棒，但似乎有问题。
function download(url, dest, callback) {
var file = fs.createWriteStream(dest);
var request = http.get(url, function (response) {
response.pipe(file);
file.on('finish', function () {
file.close(callback); // close() is async, call callback after close completes.
});
file.on('error', function (err) {
fs.unlink(dest); // Delete the file async. (But we don't check the result)
if (callback)
callback(err.message);
});
});
}
您可以创建一个HTTP GET请求，并将其响应管道到可写文件流:
const http = require('http'); // or 'https' for https:// URLs
const fs = require('fs');
const file = fs.createWriteStream("file.jpg");
const request = http.get("http://i3.ytimg.com/vi/J---aiyznGQ/mqdefault.jpg", function(response) {
response.pipe(file);
// after download completed close filestream
file.on("finish", () => {
file.close();
console.log("Download Completed");
});
});
如果您希望支持在命令行上收集信息(比如指定目标文件或目录或URL)，可以使用类似Commander的工具。
更详细的解释在https://sebhastian.com/nodejs-download-file/
你可以使用https://github.com/douzi8/ajax-request#download
request.download('http://res.m.ctrip.com/html5/Content/images/57.png',
function(err, res, body) {}
);
使用promise下载，它解析可读流。添加额外的逻辑来处理重定向。
var http = require('http');
var promise = require('bluebird');
var url = require('url');
var fs = require('fs');
var assert = require('assert');
function download(option) {
assert(option);
if (typeof option == 'string') {
option = url.parse(option);
}
return new promise(function(resolve, reject) {
var req = http.request(option, function(res) {
if (res.statusCode == 200) {
resolve(res);
} else {
if (res.statusCode === 301 && res.headers.location) {
resolve(download(res.headers.location));
} else {
reject(res.statusCode);
}
}
})
.on('error', function(e) {
reject(e);
})
.end();
});
}
download('http://localhost:8080/redirect')
.then(function(stream) {
try {
var writeStream = fs.createWriteStream('holyhigh.jpg');
stream.pipe(writeStream);
} catch(e) {
console.error(e);
}
});
✅So if you use pipeline, it would close all other streams and make sure that there are no memory leaks. Working example: const http = require('http'); const { pipeline } = require('stream'); const fs = require('fs'); const file = fs.createWriteStream('./file.jpg'); http.get('http://via.placeholder.com/150/92c952', response => { pipeline( response, file, err => { if (err) console.error('Pipeline failed.', err); else console.log('Pipeline succeeded.'); } ); });
从我的回答“在流上。pipe和。pipeline之间有什么区别”。
