使用 node.js (http.get) 读取远程文件
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Read remote file with node.js (http.get)
提问by 7zark7
Whats the best way to read a remote file? I want to get the whole file (not chunks).
读取远程文件的最佳方法是什么？我想获取整个文件（不是块）。
I started with the following example
我从下面的例子开始
var get = http.get(options).on('response', function (response) {
response.on('data', function (chunk) {
console.log('BODY: ' + chunk);
});
});
I want to parse the file as csv, however for this I need the whole file rather than chunked data.
我想将文件解析为 csv，但是为此我需要整个文件而不是分块数据。
回答by 7zark7
I'd use requestfor this:
我会为此使用请求：
request('http://google.com/doodle.png').pipe(fs.createWriteStream('doodle.png'))
Or if you don't need to save to a file first, and you just need to read the CSV into memory, you can do the following:
或者，如果您不需要先保存到文件，而只需要将 CSV 读入内存，则可以执行以下操作：
var request = require('request');
request.get('http://www.whatever.com/my.csv', function (error, response, body) {
if (!error && response.statusCode == 200) {
var csv = body;
// Continue with your processing here.
}
});
etc.
等等。
回答by 7zark7
http.get(options).on('response', function (response) {
var body = '';
var i = 0;
response.on('data', function (chunk) {
i++;
body += chunk;
console.log('BODY Part: ' + i);
});
response.on('end', function () {
console.log(body);
console.log('Finished');
});
});
Changes to this, which works. Any comments?
对此进行更改，这很有效。任何意见？
回答by Freddy
You can do something like this, without using any external libraries.
您可以执行此类操作，而无需使用任何外部库。
const fs = require("fs");
const https = require("https");
const file = fs.createWriteStream("data.txt");
https.get("https://www.w3.org/TR/PNG/iso_8859-1.txt", response => {
var stream = response.pipe(file);
stream.on("finish", function() {
console.log("done");
});
});
回答by Sarath Kumar Rajendran
function(url,callback){
request(url).on('data',(data) => {
try{
var json = JSON.parse(data);
}
catch(error){
callback("");
}
callback(json);
})
}
You can also use this. This is to async flow. The error comes when the response is not a JSON. Also in 404 status code .
你也可以使用这个。这是异步流程。当响应不是 JSON 时会出现错误。同样在 404 状态代码中。
