javascript 无法使用 node.js 和请求保存远程图像
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Cannot save a remote image with node.js and request
提问by Alexander T.
I want to save an image with node.js and the request library. So far I have this simple code:
我想用 node.js 和请求库保存图像。到目前为止，我有这个简单的代码：
var request = require('request');
var fs = require('fs');
request('http://upload.wikimedia.org/wikipedia/commons/8/8c/JPEG_example_JPG_RIP_025.jpg', function(error, response, body)
{
// further logic that decides
// whether or not the image will be saved
fs.writeFile('downloaded.jpg', body, function(){});
});
But it doesn't work. The image always arrives corrupt. I assume it's an encoding error but I cannot figure out how to fix this.
但它不起作用。图像总是到达损坏。我认为这是一个编码错误，但我不知道如何解决这个问题。
回答by Alexander T.
var request = require('request'),
fs = require('fs'),
url = 'http://upload.wikimedia.org/wikipedia/commons/8/8c/JPEG_example_JPG_RIP_025.jpg';
request(url, {encoding: 'binary'}, function(error, response, body) {
fs.writeFile('downloaded.jpg', body, 'binary', function (err) {});
});
回答by kaxi1993
var fs = require('fs'),
request = require('request'),
url='http://upload.wikimedia.org/wikipedia/commons/8/8c/JPEG_example_JPG_RIP_025.jpg';
request(url).pipe(fs.createWriteStream('downloaded.jpg'));
回答by prayagupd
Here's how I did it using streamand pipe, (I was using expressbut you may not need that)
这是我使用streamand 的方法pipe，（我正在使用，express但您可能不需要）
var express = require('express');
var app = express();
var filesystem = require('fs');
var https = require('https');
var download = function(url, dest, cb) {
var file = filesystem.createWriteStream(dest);
var request = https.get(url, function(httpResponse) {
httpResponse.pipe(file);
file.on('finish', function() {
console.log("piping to file finished")
file.close(cb); // close() is async, call cb after close completes.
});
}).on('error', function(err) { // Handle errors
filesystem.unlink(dest); // Delete the file async. (But we don't check the result)
if (cb) cb(err.message);
});
};
app.get('/image', (req, res) => {
download('https://lastfm-img2.akamaized.net/i/u/64s/15cc734fb0e045e3baac02674d2092d6.png',
'porcupine.png',
() => {console.log("downloaded to porcupine.png")})
})
When I run using node server.jsand hit the url localhost:3000/image, it will download and save the file to porcupine.pngin the base directory.
当我运行 usingnode server.js并点击 url 时localhost:3000/image，它将下载文件并将其保存到porcupine.png基本目录中。
