下载糗事百科的内容_python版

代码如下:

#coding:utf-8

import urllib.request
import xml.dom.minidom
import sqlite3
import threading
import time

class logger(object):
def log(self,*msg):
for i in msg:
print(i)

Log = logger()
Log.log('测试下')

class downloader(object):

def __init__(self,url):
self.url = url

def download(self):
Log.log('开始下载',self.url)
try:
content = urllib.request.urlopen(self.url).read()
#req = urllib.request.Request(url)
#response = urllib.request.urlopen(req)
#content = response.read()
Log.log('下载完毕')
return(content)
except:
Log.log('下载出错')
return(None)


class parser(object):

def __init__(self,content):
#获得根节点
self.html = xml.dom.minidom.parseString(content)

def parse(self):
Log.log('开始提取数据')
contents = {'content':'','url':[]}
#获得div节点
divs = self.html.getElementsByTagName('div')
#获得content节点
for div in divs:
if div.hasAttribute('class') and \
div.getAttribute('class') == 'content':
#获得糗事百科的内容
textNode = div.childNodes[0]
qContent = textNode.data
#数据填充
contents['content'] = qContent

#获得上一糗事、下一糗事节点
spans = self.html.getElementsByTagName('span')
for span in spans:
pspan = span.parentNode
if pspan.tagName == 'a':
#pspan为对应的链接,此时需要将对应的地址加入数据库
url = pspan.getAttribute('href')
qid = url[10:][:-4]
#数据填充
contents['url'].append(qid)
Log.log('提取数据完毕')
return(contents)

def downloadPage(qid,db):
url = 'http://www.qiushibaike.com/articles/'+str(qid)+'.htm'
content = downloader(url).download()
if content:
contents = parser(content).parse()
if contents['content']:
db.updateContent(qid,contents['content'])
for i in contents['url']:
db.addQID(i)
if len(contents['url']) == 2:
db.updateStatus(qid,2)

#下载池，表示同时允许下载的链接个数
class downloaderPool(object):
def __init__(self,maxLength=15):
self.downloaders = [None]*maxLength
self.downloadList = []
self.db = None

def setDownloadList(self,downloadList):
self.downloadList = list(set(self.downloadList+downloadList))

def setdb(self,db):
self.db = db

def daemon(self):
#每隔一秒查询线程的状态，为非活动线程则设置为None
Log.log('设置守护进程')
for index,downloader in enumerate(self.downloaders):
if downloader:
if not downloader.isAlive():
Log.log('将下载器置空',index)
self.downloaders[index] = None

#检查线程池状态
for index,downloader in enumerate(self.downloaders):
if not downloader:
qid = self.getQID()
if qid:
#创建线程
t = threading.Thread(target=downloadPage,args=(qid,self.db))
self.downloaders[index] = t
t.start()
t.join()
Log.log('设置下载器',index)
#间隔一秒执行一次
time.sleep(1)

def getQID(self):
try:
tmp = self.downloadList[0]
del self.downloadList[0]
return(tmp)
except:
return(None)

def beginDownload(self):
#创建守护线程
daemon = threading.Thread(target=self.daemon)
daemon.setDaemon(True)
daemon.start()
daemon.join()

def getDownloader(self):
for index,downloader in enumerate(self.downloaders):
if not downloader:
return(index)
return(None)


ADD_Q_ID = 'insert into qiushibaike(id,success) values(?,?)'
UPDATE_Q_CONTENT = 'update qiushibaike set content=? where id=?'
UPDATE_Q_STATUS = 'update qiushibaike set success=? where id=?'
Q_LIST = 'select id from qiushibaike where success=?'
Q_LIST_BY_ID = 'select count(*) from qiushibaike where id=?'
class dbConnect(object):
"""
create table qiushibaike(
id,Integer
content,Varchar
success,Interger
)
#id表示糗事的ID
#content表示糗事的内容
#success表示是否下载成功，当该糗事内容下载完成，且获得ID时表示下载完成
1表示未完成
2表示完成
"""
def __init__(self,dbpath='db.sqlite'):
self.dbpath = dbpath

def addQID(self,qid):
Log.log('插入糗事百科',qid)
#获得连接
cn = sqlite3.connect(self.dbpath)
c = cn.cursor()

try:
#添加内容并提交
c.execute(ADD_Q_ID,(qid,1))
cn.commit()
except:
Log.log('添加ID出错',qid)

#关闭连接
c.close()

cn.close()
Log.log('插入成功')

def updateContent(self,qid,content):
Log.log('更新糗事百科',qid,content)
#获得连接
cn = sqlite3.connect(self.dbpath)
c = cn.cursor()
#添加内容并提交
c.execute(UPDATE_Q_CONTENT,(content,qid))
cn.commit()
#关闭连接
c.close()
cn.close()
Log.log('更新成功')

def updateStatus(self,qid,flag):
Log.log('更新状态',qid,flag)
#获得连接
cn = sqlite3.connect(self.dbpath)
c = cn.cursor()
#添加内容并提交
c.execute(UPDATE_Q_STATUS,(flag,qid))
cn.commit()
#关闭连接
c.close()
cn.close()
Log.log('更新状态成功')

def getList(self,unDonloaded=1):
Log.log('获得列表')
l = []
#获得连接
cn = sqlite3.connect(self.dbpath)
c = cn.cursor()
#获得数据
c.execute(Q_LIST,(unDonloaded,))
rows = c.fetchall()

for i in rows:
l.append(i[0])
#关闭连接
c.close()
cn.close()

Log.log('获得列表成功')
return(l)

class singleDownloader(object):
def __init__(self):
self.downloadList = []

def setdb(self,db):
self.db = db

def setDownloadList(self,downloadList):
self.downloadList = list(set(self.downloadList+downloadList))

def beginDownload(self):
for i in self.downloadList:
downloadPage(i,self.db)

def main():
db = dbConnect('db.sqlite')
#dp = downloaderPool()
#dp.setdb(db)
sp = singleDownloader()
sp.setdb(db)

dp=sp

unDownloadedList = db.getList()
#当还有未下载的糗事时就要继续下载
while(len(unDownloadedList)):
#使用该列表填充下载池
dp.setDownloadList(unDownloadedList)

dp.beginDownload()

time.sleep(1)
#重置参数
unDownloadedList = db.getList()

if __name__ == '__main__':
main()

代码是没问题的，可以正常运行，但是希望做到以下2方面：
1、多线程下载
2、代码分离度更高，跟面向对象