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。
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
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) {}
);
其他回答
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);
}
});
var requestModule=require("request");
requestModule(filePath).pipe(fs.createWriteStream('abc.zip'));
var fs = require('fs'),
request = require('request');
var download = function(uri, filename, callback){
request.head(uri, function(err, res, body){
console.log('content-type:', res.headers['content-type']);
console.log('content-length:', res.headers['content-length']);
request(uri).pipe(fs.createWriteStream(filename)).on('close', callback);
});
};
download('https://www.cryptocompare.com/media/19684/doge.png', 'icons/taskks12.png', function(){
console.log('done');
});
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/
编写自己的解决方案,因为现有的不符合我的要求。
包括:
HTTPS下载(http下载时切换包到http) 基于承诺的函数 处理转发路径(状态302) 浏览器头-需要在一些cdn 来自URL的文件名(以及硬编码) 错误处理
打印出来的,更安全。如果你使用的是纯JS(没有Flow,没有TS),可以随意删除类型,或者转换为.d。ts文件
index.js
import httpsDownload from httpsDownload;
httpsDownload('https://example.com/file.zip', './');
httpsDownload.[js|ts]
import https from "https";
import fs from "fs";
import path from "path";
function download(
url: string,
folder?: string,
filename?: string
): Promise<void> {
return new Promise((resolve, reject) => {
const req = https
.request(url, { headers: { "User-Agent": "javascript" } }, (response) => {
if (response.statusCode === 302 && response.headers.location != null) {
download(
buildNextUrl(url, response.headers.location),
folder,
filename
)
.then(resolve)
.catch(reject);
return;
}
const file = fs.createWriteStream(
buildDestinationPath(url, folder, filename)
);
response.pipe(file);
file.on("finish", () => {
file.close();
resolve();
});
})
.on("error", reject);
req.end();
});
}
function buildNextUrl(current: string, next: string) {
const isNextUrlAbsolute = RegExp("^(?:[a-z]+:)?//").test(next);
if (isNextUrlAbsolute) {
return next;
} else {
const currentURL = new URL(current);
const fullHost = `${currentURL.protocol}//${currentURL.hostname}${
currentURL.port ? ":" + currentURL.port : ""
}`;
return `${fullHost}${next}`;
}
}
function buildDestinationPath(url: string, folder?: string, filename?: string) {
return path.join(folder ?? "./", filename ?? generateFilenameFromPath(url));
}
function generateFilenameFromPath(url: string): string {
const urlParts = url.split("/");
return urlParts[urlParts.length - 1] ?? "";
}
export default download;