Python多线程结合队列下载百度音乐的方法

本文实例讲述了Python多线程结合队列下载百度音乐的方法。分享给大家供大家参考。具体如下：

一直想做个下载音乐的脚本，后来决定就拿百度音乐开刀，经过多次分析，终于制作了一个下载百度音乐的脚本，目前只默认下载第一页，童鞋们可以自由拓展。
适用Windows和Linux平台、依赖BeautifulSoup这个库，主要对HTML进行解析

#!/usr/bin/python
# -*- coding: utf-8 -*-
'''
 百度中批量下载某歌手的歌(目前只下载第一页，可以自行拓展)
 @author:admin
 @qq: 1243385033
'''
import threading, urllib2, os,re,sys
from bs4 import BeautifulSoup
from Queue import Queue
'''目标歌手'''
SINGER = u'亚东'
'''保存路径'''
SAVE_FOLDER = 'F:/music/'
# 查询url
search_url = "http://music.baidu.com/search/song?key=%s&s=1"
# 百度音乐播放盒url
song_url = "http://box.zhangmen.baidu.com/x?op=12&count=1&mtype=1&title="
class Downloader(threading.Thread):
  def __init__(self, task):
    threading.Thread.__init__(self)
    self.task = task
  def run(self):
    '''覆盖父类的run方法'''
    while True:
      url = self.task.get()
      self.download(url)
      self.task.task_done()
  def build_path(self, filename):
    join = os.path.join
    parentPath=join(SAVE_FOLDER,SINGER)
    filename = filename + '.mp3'
    myPath = join(parentPath, filename)
    return myPath
  def download(self, url):
    '''下载文件'''
    sub_url = url.items()
    f_name = sub_url[0][0]
    req_url = sub_url[0][1]
    handle = urllib2.urlopen(req_url)
    # 保存路径
    save_path = self.build_path(f_name)
    with open(save_path, "wb") as handler:
      while True:
        chunk = handle.read(1024)
        if not chunk:
          break
        handler.write(chunk)
        msg = u"已经从 %s下载完成" % req_url
      sys.stdout.write(msg)
      sys.stdout.flush()
class HttpRequest:
  def __init__(self):
    self.task = []
    self.reg_decode = re.compile('<decode>.*&#63;CDATA\[(.*&#63;)\]].*&#63;</decode>')
    self.reg_encode = re.compile('<encode>.*&#63;CDATA\[(.*&#63;)\]].*&#63;</encode>')
    self.init()
    self.target_url = search_url % urllib2.quote(self.encode2utf8(SINGER))
  def encode2utf8(self,source):
    if source and isinstance(source,(str,unicode)):
      source=source.encode("utf8")
      return source
    return source
  def mkDir(self, dir_name):
    if not os.path.exists(dir_name):
      os.mkdir(dir_name)
  def init(self):
    self.mkDir(SAVE_FOLDER)
    subPath = os.path.join(SAVE_FOLDER, SINGER)
    self.mkDir(subPath)
  def http_request(self):
    global song_url
    '''发起请求'''
    response=urllib2.urlopen(self.target_url)
    # 获取头信息
    content = response.read()
    response.close()
    # 使用BeautifulSoup
    html = BeautifulSoup(content, from_encoding="utf8")
    # 提取HTML标签
    span_tag = html.find_all('div', {"monkey":"song-list"})[0].find_all('span', class_='song-title')
      # 遍历List
    for a_tag in span_tag:
      song_name = unicode(a_tag.find_all("a")[0].get_text())
      song_url = song_url + urllib2.quote(self.encode2utf8(song_name))
      song_url = song_url + '$$' + urllib2.quote(self.encode2utf8(SINGER)) + '$$$$&url=&listenreelect=0&.r=0.1696378872729838'
      xmlfile = urllib2.urlopen(song_url)
      xml_content = xmlfile.read()
      xmlfile.close()
      url1 = re.findall(self.reg_encode, xml_content)
      url2 = re.findall(self.reg_decode, xml_content)
      if not url1 or not url2:
        continue
      url = url1[0][:url1[0].rindex('/') + 1] + url2[0]
      self.task.append({song_name:url})
    return self.task
def start_download(urls):
  #创建一个队列
  quene=Queue()
  #获取list的大小
  size=len(urls)
  #开启线程
  for _ in xrange(size):
    t=Downloader(quene)
    t.setDaemon(True)
    t.start()
  #入队列
  for url in urls:
    quene.put(url)
  quene.join()
if __name__=='__main__':
  http=HttpRequest()
  urls=http.http_request()
  start_download(urls)

希望本文所述对大家的Python程序设计有所帮助。