Question

我想下载包含图片数量的图片文件夹。我需要下载到我的本地目录。我下载了一张图像名称。但我无法理解我怎样才能为多个图像本身做到这一点。这是我的代码。

var http = require('http');
var fs = require('fs');

var file = fs.createWriteStream("./downloads");
var request = http.get("http://www.salonsce.com/extranet/uploadfiles" + image.png, function(response) {
  response.pipe(file);
});

提前致谢。

Answer 1

要在Node.js中使用curl下载文件，您需要使用Node的child_process模块。你必须使用child_process的spawn方法调用curl。为了方便起见，我使用spawn而不是exec - spawn返回一个带有数据事件的流，并且不像exec那样有缓冲区大小问题。这并不意味着exec不如产卵;实际上我们将使用exec使用wget下载文件。

// Function to download file using curl
var download_file_curl = function(file_url) {

    // extract the file name
    var file_name = url.parse(file_url).pathname.split('/').pop();
    // create an instance of writable stream
    var file = fs.createWriteStream(DOWNLOAD_DIR + file_name);
    // execute curl using child_process' spawn function
    var curl = spawn('curl', [file_url]);
    // add a 'data' event listener for the spawn instance
    curl.stdout.on('data', function(data) { file.write(data); });
    // add an 'end' event listener to close the writeable stream
    curl.stdout.on('end', function(data) {
        file.end();
        console.log(file_name + ' downloaded to ' + DOWNLOAD_DIR);
    });
    // when the spawn child process exits, check if there were any errors and close the writeable stream
    curl.on('exit', function(code) {
        if (code != 0) {
            console.log('Failed: ' + code);
        }
    });
};

Answer 2

更好的方法是并行使用另一个名为glob的工具。像，

首先用

安装

npm install glob

然后，

var glob = require("glob");
var http = require('http');
var fs = require('fs');

var file = fs.createWriteStream("./downloads");

// options is optional
//options = {};
glob('http://www.salonsce.com/extranet/uploadfiles/*', options, function (er, files) {
  //you will get list of files in the directory as an array.
  // now use your previus logic to fetch individual file
  // the name of which can be found by iterating over files array
  // loop over the files array. please implement you looping construct.
  var request = http.get(files[i], function(response) {
      response.pipe(file);
  });

});

如何使用nodejs将图像文件夹从网站下载到本地目录

2 个答案: