Nodejs 爬虫批量下载百度图片

漂亮蓝影

var fs = require('fs'),
path = require('path'),
util = require('util'), // 以上为Nodejs自带依赖包
request = require('request'); // 需要npm install的包
// main函数，使用 node main执行即可
patchPreImg();
// 批量处理图片
function patchPreImg() {
var tag1 = '摄影', tag2 = '国家地理',
url = 'http://image.baidu.com/data/imgs?pn=%s&rn=60&p=channel&from=1&col=%s&tag=%s&sort=1&tag3=',
url = util.format(url, 0, tag1, tag2),
url = encodeURI(url),
dir = 'D:/downloads/images/',
dir = path.join(dir, tag1, tag2),
dir = mkdirSync(dir);
request(url, function(error, response, html) {
var data = JSON.parse(html);
if (data && Array.isArray(data.imgs)) {
var imgs = data.imgs;
imgs.forEach(function(img) {
if (Object.getOwnPropertyNames(img).length > 0) {
var desc = img.desc || ((img.owner && img.owner.userName) + img.column);
desc += '(' + img.id + ')';
var downloadUrl = img.downloadUrl || img.objUrl;
downloadImg(downloadUrl, dir, desc);
}
});
}
});
}
// 循环创建目录
function mkdirSync(dir) {
var parts = dir.split(path.sep);
for (var i = 1; i <= parts.length; i++) {
dir = path.join.apply(null, parts.slice(0, i));
fs.existsSync(dir) || fs.mkdirSync(dir);
}
return dir;
}
var index = 1;
// 开始下载图片，并log统计日志
function downloadImg(url, dir, desc) {
var fileType = 'jpg';
if (url.match(/\.(\w+)$/)) fileType = RegExp.$1;
desc += '.' + fileType;
var options = {
url: url,
headers: {
Host: 'f.hiphotos.baidu.com',
Cookie: 'BAIDUID=810ACF57B5C38556045DFFA02C61A9F8:FG=1;'
}
};
var startTime = new Date().getTime();
request(options)
.on('response', function() {
var endTime = new Date().getTime();
console.log('Downloading...%s.. %s, 耗时: %ss', index++, desc, (endTime - startTime) / 1000);
})
.pipe(fs.createWriteStream(path.join(dir, desc)));
}

 

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