复制代码 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，且获得上一页、下一页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