DesktopNexus 是我最喜爱的一个壁纸下载网站，上面有许多高质量的壁纸，几乎每天必上， 每月也必会坚持分享我这个月来收集的壁纸

但是 DesktopNexus 壁纸的下载很麻烦，而且因为壁纸会通过浏览器检测你当前分辨率来展示 合适你当前分辨率的壁纸，再加上是国外的网站，速度上很不乐观。

于是我写了个脚本，检测输入的页面中壁纸页面的链接，然后批量下载到指定文件夹中。

脚本使用 python 写的，所以需要机器上安装有 python 。

用法：

$ python desktop_nexus.py -p http://www.desktopnexus.com/tag/cat/ -s 1280x800 -o wallpapers

-p 包含 DesktopNexus 壁纸链接的页面，比如我的壁纸分享

-s 壁纸尺寸，可选，缺省为 1440x900

-o 壁纸输出的文件夹，可选，缺省为当前目录下的 wallpapers， 如果不存在会自动创建

代码：

#-*- coding: utf-8 -*- from argparse import ArgumentParser import os, re, sys import urllib2, cookielib, urlparse RE_WALLPAPER = r'http://[^/.]+.desktopnexus.com/wallpaper/d+/' CHUNK_SIZE = 1024 * 3 class DesktopNexus: def __init__(self, page=None, size=None, output_dir=None): self.page = page self.size = size self.output_dir = output_dir def start(self): print 'Making output directory:', self.output_dir if not os.path.exists(self.output_dir): os.makedirs(self.output_dir) # Setup cookie cookie = cookielib.CookieJar() processer = urllib2.HTTPCookieProcessor(cookie) opener = urllib2.build_opener(processer) urllib2.install_opener(opener) self._read_page() def _get_pic_info(self, url): pic_id = url.split('/')[-2] html = urllib2.urlopen(url).read() pattern = r'<a href="/get/%s/?t=(?P<token>.*"' % pic_id match = re.search(pattern, html, flags=re.I|re.M|re.S) if match: return {'id': pic_id, 'token': match.group('token'), 'size': self.size} else: raise Exception('Cound not find wallpaper') def _get_pic_file(self, pic_info): redirect_url = 'http://www.desktopnexus.com/dl/inline/%(id)s/%(size)s/%(token)s' % pic_info request = urllib2.urlopen(redirect_url) return request.geturl() def _download_pic(self, url): pic_info = self._get_pic_info(url) pic_file = self._get_pic_file(pic_info) filename = os.path.split(urlparse.urlparse(pic_file).path)[-1] filename = os.path.join(self.output_dir, filename) with open(filename, 'wb') as output: resp = urllib2.urlopen(pic_file) total_size = int(resp.info().get('Content-Length')) saved_size = 0.0 while saved_size != total_size: chunk = resp.read(CHUNK_SIZE) saved_size += len(chunk) output.write(chunk) self._print_progress('Saving file: %s' % filename, saved_size / total_size * 100) def _print_progress(self, msg, progress): sys.stdout.write('%-71s%3d%%r' % (len(msg) <= 70 and msg or msg[:67] + '...', progress)) sys.stdout.flush() if progress >= 100: sys.stdout.write('n') def _read_page(self): try: print 'Fetching content:', self.page html = urllib2.urlopen(self.page).read() links = set(re.findall(RE_WALLPAPER, html, re.M|re.I)) count = len(links) print 'Downloading wallpapers:' for i, link in enumerate(links): print '[%d/%d]: %s' % (i + 1, count, link) try: self._download_pic(link) except Exception as e: print 'Error downloading wallpaper.', e.message except Exception as e: print 'Error fetching content.', e if __name__ == '__main__': # Setup argparser parser = ArgumentParser('python desktop_nexus.py') parser.add_argument('-p', '--page', dest='page', required=True, help='specific a page that includes wallpaper list') parser.add_argument('-s', '--size', dest='size', default='1440x900', help='specific the wallpaper size, default to 1440x900') parser.add_argument('-o', '--output', dest='output_dir', default='wallpapers', help='specific the output directory, default to "wallpapers"') args = parser.parse_args() dn = DesktopNexus(**args.__dict__) dn.start()