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
对于那些寻找es6风格的基于承诺的方式的人来说,我猜它会是这样的:
var http = require('http');
var fs = require('fs');
function pDownload(url, dest){
var file = fs.createWriteStream(dest);
return new Promise((resolve, reject) => {
var responseSent = false; // flag to make sure that response is sent only once.
http.get(url, response => {
response.pipe(file);
file.on('finish', () =>{
file.close(() => {
if(responseSent) return;
responseSent = true;
resolve();
});
});
}).on('error', err => {
if(responseSent) return;
responseSent = true;
reject(err);
});
});
}
//example
pDownload(url, fileLocation)
.then( ()=> console.log('downloaded file no issues...'))
.catch( e => console.error('error while downloading', e));
其他回答
Gfxmonk的答案在回调和file.close()完成之间有一个非常紧张的数据竞赛。File.close()实际上接受一个回调函数,该函数在close完成时被调用。否则,立即使用文件可能会失败(非常罕见!)。
一个完整的解决方案是:
var http = require('http');
var fs = require('fs');
var download = function(url, dest, cb) {
var file = fs.createWriteStream(dest);
var request = http.get(url, function(response) {
response.pipe(file);
file.on('finish', function() {
file.close(cb); // close() is async, call cb after close completes.
});
});
}
如果不等待finish事件,幼稚的脚本可能最终得到一个不完整的文件。如果不通过close调度cb回调,您可能会在访问文件和文件实际准备就绪之间出现竞争。
我发现这种方法是最有帮助的,特别是当涉及到pdf和其他随机文件时。
import fs from "fs";
fs.appendFile("output_file_name.ext", fileDataInBytes, (err) => {
if (err) throw err;
console.log("File saved!");
});
也许node.js已经改变了,但似乎其他解决方案(使用node v8.1.2)有一些问题:
You don't need to call file.close() in the finish event. Per default the fs.createWriteStream is set to autoClose: https://nodejs.org/api/fs.html#fs_fs_createwritestream_path_options file.close() should be called on error. Maybe this is not needed when the file is deleted (unlink()), but normally it is: https://nodejs.org/api/stream.html#stream_readable_pipe_destination_options Temp file is not deleted on statusCode !== 200 fs.unlink() without a callback is deprecated (outputs warning) If dest file exists; it is overridden
下面是一个修改后的解决方案(使用ES6和promises),它可以处理这些问题。
const http = require("http");
const fs = require("fs");
function download(url, dest) {
return new Promise((resolve, reject) => {
const file = fs.createWriteStream(dest, { flags: "wx" });
const request = http.get(url, response => {
if (response.statusCode === 200) {
response.pipe(file);
} else {
file.close();
fs.unlink(dest, () => {}); // Delete temp file
reject(`Server responded with ${response.statusCode}: ${response.statusMessage}`);
}
});
request.on("error", err => {
file.close();
fs.unlink(dest, () => {}); // Delete temp file
reject(err.message);
});
file.on("finish", () => {
resolve();
});
file.on("error", err => {
file.close();
if (err.code === "EEXIST") {
reject("File already exists");
} else {
fs.unlink(dest, () => {}); // Delete temp file
reject(err.message);
}
});
});
}
这里还有另一种方法来处理它没有第三方依赖,也搜索重定向:
var download = function(url, dest, cb) {
var file = fs.createWriteStream(dest);
https.get(url, function(response) {
if ([301,302].indexOf(response.statusCode) !== -1) {
body = [];
download(response.headers.location, dest, cb);
}
response.pipe(file);
file.on('finish', function() {
file.close(cb); // close() is async, call cb after close completes.
});
});
}
你好,我认为你可以使用child_process模块和curl命令。
const cp = require('child_process');
let download = async function(uri, filename){
let command = `curl -o ${filename} '${uri}'`;
let result = cp.execSync(command);
};
async function test() {
await download('http://zhangwenning.top/20181221001417.png', './20181221001417.png')
}
test()
另外,当你想下载较大、多个文件时,你可以使用集群模块来使用更多的cpu内核。