利用爬虫获取网上医院药品价格信息 （下）
程序员文章站
2022-03-31 13:26:44
因为之前的爬虫存在着各种不足，在此我们进行一些必要的扩展和改进。 一、加入代理服务器 首先，编写另外一个爬虫搜集网上的免费代理服务器 编写代理服务器数据爬虫程序”getproxy2.py”，代码如下： 1 from bs4 import BeautifulSoup 2 import urllib2 ......
因为之前的爬虫存在着各种不足，在此我们进行一些必要的扩展和改进。
一、加入代理服务器
首先，编写另外一个爬虫搜集网上的免费代理服务器
编写代理服务器数据爬虫程序”getproxy2.py”，代码如下：
1 from bs4 import BeautifulSoup
2 import urllib2
3 from myLog import MyLog
4 import csv
5 import time
6 import re
7
8 class Item(object):
9 IP = None #IP地址
10 port = None #端口
11 type = None #类型
12 address = None #地址
13
14 class Get_proxy(object):
15 def __init__(self):
16 self.log = MyLog()
17 self.log.info(u'Get_proxy 开始运行！')
18 self.urls = self.get_urls()
19 self.log.info(u'获取需要访问的url，共 %d 个' % len(self.urls))
20 self.proxy_list = self.spider(self.urls)
21 self.log.info(u'获取到代理服务器地址，共 %d 个' % len(self.proxy_list))
22 self.alivelist = self.testproxy(self.proxy_list)
23 self.pipelines(self.alivelist)
24 self.log.info(u'Get_proxy 运行结束！')
25
26 def get_urls(self):
27 urls = []
28 num_max = 20
29 for n in range(1,num_max+1):
30 url = 'http://www.xicidaili.com/wn/'+str(n)
31 urls.append(url)
32 return urls
33
34 def getresponsecontent(self,url):
35 try:
36 Headers = {"User-Agent":"Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; en) Presto/2.8.131 Version/11.11"}
37 request = urllib2.Request(url.encode('utf8'),headers = Headers)
38 response = urllib2.urlopen(request)
39 except:
40 self.log.error(u'返回 URL: %s 数据失败' % url)
41 return ''
42 else:
43 self.log.info(u'返回URL: %s 数据成功' % url)
44 return response
45
46 def spider(self,urls):
47 items = []
48 for url in urls:
49 time.sleep(10)
50 htmlcontent = self.getresponsecontent(url)
51 if htmlcontent == '':
52 continue
53 soup = BeautifulSoup(htmlcontent,'lxml')
54 proxys = soup.find_all('tr',attrs={'class':'odd'})
55 for proxy in proxys:
56 item = Item()
57 elements = proxy.find_all('td')
58 item.IP = elements[1].get_text().strip()
59 item.port = elements[2].get_text().strip()
60 item.address = elements[3].get_text().strip()
61 item.type = elements[5].get_text().strip()
62 items.append(item)
63
64 return items
65
66 def testproxy(self,proxylist):
67 self.log.info(u'开始对获取到的代理服务器进行测试 ...')
68 aliveList = []
69 ip_list = []
70 URL = r'http://www.china-yao.com/'
71 regex = re.compile(r'china-yao.com')
72 for proxy in proxylist:
73 if proxy.IP in ip_list:
74 continue #去除列表中重复的代理服务器
75 server = proxy.type.lower() + r'://' + proxy.IP + ':' + proxy.port
76 self.log.info(u'开始测试 %s' % server)
77 opener = urllib2.build_opener(urllib2.ProxyHandler({proxy.type.lower():server}))
78 urllib2.install_opener(opener)
79 try:
80 response = urllib2.urlopen(URL,timeout=3)
81 except:
82 self.log.info(u'%s 连接失败' % server)
83 continue
84 else:
85 try:
86 string = response.read()
87 except:
88 self.log.info(u'%s 连接失败' % server)
89 continue
90 if regex.search(string):
91 self.log.info(u'%s 连接成功 .......' % server)
92 ip_list.append(proxy.IP)
93 aliveList.append(proxy)
94 return aliveList
95
96
97 def pipelines(self,alivelist):
98 filename = 'proxylist.csv'
99 self.log.info(u'准备将获取到的代理服务器地址保存数据到csv文件中...')
100 writer = csv.writer(file(filename,'wb'))
101 #writer.writerow([u'IP地址'.encode('utf8'),u'端口'.encode('utf8'),u'类型'.encode('utf8'),u'地址'.encode('utf8')])
102 for aliveproxy in alivelist:
103 writer.writerow([aliveproxy.IP.encode('utf8'),aliveproxy.port.encode('utf8'),aliveproxy.type.encode('utf8'),aliveproxy.address.encode('utf8')])
104 self.log.info(u'数据保存完毕！')
105
106 if __name__ == '__main__':
107 Get_proxy()
108
代码过长，进行了折叠
从网站http://www.xicidaili.com/wn/中抓取https格式的免费代理服务器。没必要太多，这里只抓取了前20页的信息，之后利用函数testproxy对这些代理服务器进行简单的测试，把那些没有响应的代理服务器删除，将能够正常使用的全部保存到输出文件'proxylist.csv'中，以便随后在主程序中读取调用。
在原先的主程序“main.py”开头处添加代码导入
1 from getproxy2 import Get_proxy
在类GetInfor中的__init__中增加Get_proxy的调用
如下:
1 Get_proxy()
2 self.proxylist = self.getproxylist('proxylist.csv')
编写GetInfor的方法 getproxylist
1 def getproxylist(self,filename): 2 proxylist = [] 3 reader = csv.reader(open(filename,'rb')) 4 for proxy in reader: 5 proxylist.append(proxy) 6 return proxylist
在原有的方法getresponsecontent的基础上，增加一个类似的方法，其中使用代理服务器。代码如下：
1 def getresponsecontent_by_proxy(self,url):
2 Headers = {"User-Agent":"Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; en) Presto/2.8.131 Version/11.11"}
3 request = urllib2.Request(url.encode('utf8'),headers = Headers)
4 proxy = random.choice(self.proxylist)
5 server = proxy[2].lower() + r'://' + proxy[0] + ':' + proxy[1]
6 self.log.info(u'使用代理服务器 %s 访问 %s' % (server,url))
7 opener = urllib2.build_opener(urllib2.ProxyHandler({proxy[2].lower():server}))
8 urllib2.install_opener(opener)
9 try:
10 response = urllib2.urlopen(request,timeout=3)
11 except:
12 self.log.error(u'返回 URL: %s 数据失败' % url)
13 return ''
14 else:
15 self.log.info(u'返回URL: %s 数据成功' % url)
16 return response.read()
17
每次访问都将利用random.choice(self.proxylist)在获取的所有代理服务器中随机挑选一个作为当前的代理服务器，这样每次对指定的URL的访问都是不同的代理服务器。
二、使用多线程同步运行spider
因为考虑到需要使用多线程同步抓取数据，所以这里需要修改原先的spider方法，而且还需要把之前的部分功能分到其他函数里。
这里先将编写一个方法get_urls，来根据药品名称获取所有需要抓取的url，代码如下：
1 def geturls(self,names):
2 urls = []
3 for name in names:
4 if name != '':
5 self.log.info(u'尝试爬取%s 信息' % name.decode('GBK'))
6 url = 'http://www.china-yao.com/?act=search&typeid=1&keyword='+name.decode('GBK')
7 try:
8 htmlcontent = self.getresponsecontent(url)
9 except:
10 self.log.info(u'药品 %s 信息获取失败！' % name.decode('GBK'))
11 with open('namelist_error.txt','a') as namelist_error:
12 namelist_error.write(name+'\n')
13 continue
14 if htmlcontent == '':
15 self.log.info(u'药品 %s 信息获取失败！' % name.decode('GBK'))
16 with open('namelist_error.txt','a') as namelist_error:
17 namelist_error.write(name+'\n')
18 continue
19 soup = BeautifulSoup(htmlcontent,'lxml')
20 tagul = soup.find('ul',attrs={'class':'pagination'})
21 tagpage = tagul.find_all('a')
22 self.log.info(u'此药品信息共%d 页' % len(tagpage))
23 time.sleep(4)
24 if len(tagpage) == 0:
25 page = 0
26 else:
27 try:
28 page = int(tagpage[-1].get_text().strip())
29 except:
30 page = int(tagpage[-2].get_text().strip())
31 for i in range(1,page+1):
32 newurl = url+'&page='+str(i)
33 urls.append(newurl)
34 return urls
简单修改原本的spider 方法如下，访问url时使用刚刚创建的方法getresponsecontent_by_proxy。
1 def spider(self,urls,thread_num):
2 filename_error = u'N%dthread_errorlist.txt' % thread_num
3 for url in urls:
4 try:
5 htmlcontent = self.getresponsecontent_by_proxy(url)
6 if htmlcontent == '':
7 self.log.info(u'%s 页面读取失败！' % url)
8 with open(filename_error,'a') as f_error:
9 f_error.write(url.encode('utf8')+'\n')
10 continue
11 soup = BeautifulSoup(htmlcontent,'lxml')
12 tagtbody = soup.find('tbody')
13 tagtr = tagtbody.find_all('tr')
14 self.log.info(u'该页面共有记录 %d 条，开始爬取' % len(tagtr))
15 for tr in tagtr:
16 tagtd = tr.find_all('td')
17 item = Item()
18 item.mc = tagtd[0].get_text().strip()
19 item.jx = tagtd[1].get_text().strip()
20 item.gg = tagtd[2].get_text().strip()
21 item.ghj = tagtd[3].get_text().strip()
22 item.lsj = tagtd[4].get_text().strip()
23 item.scqy = tagtd[5].get_text().strip()
24 self.items.append(item)
25 self.log.info(u'页面%s 数据已保存' % url)
26 sleeptime = random.randint(2,5)
27 time.sleep(sleeptime)
28 except:
29 with open(filename_error,'a') as f_error:
30 f_error.write(url.encode('utf8')+'\n')
31 continue
利用模块threading开启多线程，首先调用模块
1 import threading
编写方法run，利用threading中的类Thread开启多线程调用前面编写的方法run，代码如下：
1 def run(self,urls,thread): 2 urls_list = [] 3 if len(urls)%thread==0: 4 length = len(urls)//thread 5 else: 6 length = len(urls)//thread+1 7 for i in range(thread): 8 urls_list.append(urls[length*i:length*i+length]) 9 self.log.info(u'开始多线程模式，线程数： %d' % thread) 10 for j in range(1,thread+1): 11 time.sleep(1) 12 t = threading.Thread(target=self.spider,args=(urls_list[j-1],j,)) 13 t.start() 14 t.join() 15 self.log.info(u'多线程模式结束')
这里先把需要访问的url列表urls_list按照分配的线程数平均分割给各线程，之后再分别调用方法run来抓取分配到的url上的信息。
三、运行程序
代码修改结束后，运行程序。
从生成的结果来看，效果还算满意。
其中，“namelist_error.txt”，“N1thread_errorlist.txt”····“N5thread_errorlist.txt”为因服务器或网络原因而抓取失败的药品名称和url列表，数量不多，单独设计spider进行抓取就可。如果抓取的数据量过大，将__init__中的self.pipelines_xls(self.items)替换成self.pipelines_csv(self.items)，将获取到的数据保存到csv文件中。
1 from bs4 import BeautifulSoup
2 import urllib2
3 from myLog import MyLog
4 import time
5 import xlwt
6 import csv
7 import random
8 from getproxy2 import Get_proxy
9 import threading
10
11 class Item(object):
12 mc = None #名称
13 jx = None #剂型
14 gg = None #规格
15 ghj = None #供货价
16 lsj = None #零售价
17 scqy = None #生成企业
18
19 class GetInfor(object):
20 def __init__(self):
21 Get_proxy()
22 self.log = MyLog()
23 self.items = []
24 self.thread = 5
25 self.starttime = time.time()
26 self.log.info(u'爬虫程序开始运行，时间： %s' % time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(self.starttime)))
27 self.medicallist = self.getmedicallist('name.txt')
28 self.proxylist = self.getproxylist('proxylist.csv')
29 self.urls = self.geturls(self.medicallist)
30 self.run(self.urls,self.thread)
31 self.log.info(u'共获取信息 %d 条' % len(self.items))
32 self.pipelines_xls(self.items)
33 self.endtime = time.time()
34 self.log.info(u'爬虫程序运行结束，时间： %s' % time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(self.endtime)))
35 self.usetime = self.endtime - self.starttime
36 self.log.info(u'用时 %d时 %d分%d秒' % (self.usetime//3600,(self.usetime%3600)//60,(self.usetime%3600)%60))
37
38 def getmedicallist(self,filename):
39 medicallist = []
40 with open(filename,'r') as fp:
41 s = fp.read()
42 for name in s.split():
43 medicallist.append(name)
44 self.log.info(u'从文件%s 中读取药品名称成功！获取药品名称 %d 个' % (filename,len(medicallist)))
45 return medicallist
46
47 def getproxylist(self,filename):
48 proxylist = []
49 reader = csv.reader(open(filename,'rb'))
50 for proxy in reader:
51 proxylist.append(proxy)
52 return proxylist
53
54 def geturls(self,names):
55 urls = []
56 for name in names:
57 if name != '':
58 self.log.info(u'尝试爬取%s 信息' % name.decode('GBK'))
59 url = 'http://www.china-yao.com/?act=search&typeid=1&keyword='+name.decode('GBK')
60 try:
61 htmlcontent = self.getresponsecontent(url)
62 except:
63 self.log.info(u'药品 %s 信息获取失败！' % name.decode('GBK'))
64 with open('namelist_error.txt','a') as namelist_error:
65 namelist_error.write(name+'\n')
66 continue
67 if htmlcontent == '':
68 self.log.info(u'药品 %s 信息获取失败！' % name.decode('GBK'))
69 with open('namelist_error.txt','a') as namelist_error:
70 namelist_error.write(name+'\n')
71 continue
72 soup = BeautifulSoup(htmlcontent,'lxml')
73 tagul = soup.find('ul',attrs={'class':'pagination'})
74 tagpage = tagul.find_all('a')
75 self.log.info(u'此药品信息共%d 页' % len(tagpage))
76 time.sleep(4)
77 if len(tagpage) == 0:
78 page = 0
79 else:
80 try:
81 page = int(tagpage[-1].get_text().strip())
82 except:
83 page = int(tagpage[-2].get_text().strip())
84 for i in range(1,page+1):
85 newurl = url+'&page='+str(i)
86 urls.append(newurl)
87 ## print urls
88 return urls
89
90 def spider(self,urls,thread_num):
91 filename_error = u'N%dthread_errorlist.txt' % thread_num
92 ## n = 0
93 for url in urls:
94 try:
95 htmlcontent = self.getresponsecontent_by_proxy(url)
96 if htmlcontent == '':
97 self.log.info(u'%s 页面读取失败！' % url)
98 with open(filename_error,'a') as f_error:
99 f_error.write(url.encode('utf8')+'\n')
100 continue
101 soup = BeautifulSoup(htmlcontent,'lxml')
102 tagtbody = soup.find('tbody')
103 tagtr = tagtbody.find_all('tr')
104 self.log.info(u'该页面共有记录 %d 条，开始爬取' % len(tagtr))
105 for tr in tagtr:
106 tagtd = tr.find_all('td')
107 item = Item()
108 item.mc = tagtd[0].get_text().strip()
109 item.jx = tagtd[1].get_text().strip()
110 item.gg = tagtd[2].get_text().strip()
111 item.ghj = tagtd[3].get_text().strip()
112 item.lsj = tagtd[4].get_text().strip()
113 item.scqy = tagtd[5].get_text().strip()
114 self.items.append(item)
115 self.log.info(u'页面%s 数据已保存' % url)
116 sleeptime = random.randint(2,5)
117 time.sleep(sleeptime)
118 except:
119 with open(filename_error,'a') as f_error:
120 f_error.write(url.encode('utf8')+'\n')
121 continue
122 ## n += 1
123 ## if n >= 5:
124 ## break
125 ## self.log.info(u'数据爬取结束，共获取 %d条数据。' % len(items))
126
127 def run(self,urls,thread):
128 urls_list = []
129 if len(urls)%thread==0:
130 length = len(urls)//thread
131 else:
132 length = len(urls)//thread+1
133 for i in range(thread):
134 urls_list.append(urls[length*i:length*i+length])
135 self.log.info(u'开始多线程模式，线程数： %d' % thread)
136 for j in range(1,thread+1):
137 time.sleep(1)
138 t = threading.Thread(target=self.spider,args=(urls_list[j-1],j,))
139 t.start()
140 t.join()
141 self.log.info(u'多线程模式结束')
142
143
144 def pipelines_xls(self,medicallist):
145 filename = u'西药药品价格数据.xls'.encode('GBK')
146 self.log.info(u'准备保存数据到excel中...')
147 book = xlwt.Workbook(encoding = 'utf8',style_compression=0)
148 sheet = book.add_sheet(u'西药药品价格')
149 sheet.write(0,0,u'名称'.encode('utf8'))
150 sheet.write(0,1,u'剂型'.encode('utf8'))
151 sheet.write(0,2,u'规格'.encode('utf8'))
152 sheet.write(0,3,u'供货价'.encode('utf8'))
153 sheet.write(0,4,u'零售价'.encode('utf8'))
154 sheet.write(0,5,u'生产企业'.encode('utf8'))
155 for i in range(1,len(medicallist)+1):
156 item = medicallist[i-1]
157 sheet.write(i,0,item.mc)
158 sheet.write(i,1,item.jx)
159 sheet.write(i,2,item.gg)
160 sheet.write(i,3,item.ghj)
161 sheet.write(i,4,item.lsj)
162 sheet.write(i,5,item.scqy)
163 book.save(filename)
164 self.log.info(u'excel文件保存成功！')
165
166 def pipelines_csv(self,medicallist):
167 filename = u'西药药品价格数据.csv'.encode('GBK')
168 self.log.info(u'准备保存数据到csv中...')
169 writer = csv.writer(file(filename,'wb'))
170 writer.writerow([u'名称'.encode('utf8'),u'剂型'.encode('utf8'),u'规格'.encode('utf8'),u'供货价'.encode('utf8'),u'零售价'.encode('utf8'),u'生产企业'.encode('utf8')])
171 for i in range(1,len(medicallist)+1):
172 item = medicallist[i-1]
173 writer.writerow([item.mc.encode('utf8'),item.jx.encode('utf8'),item.gg.encode('utf8'),item.ghj.encode('utf8'),item.lsj.encode('utf8'),item.scqy.encode('utf8')])
174 self.log.info(u'csv文件保存成功！')
175
176 def getresponsecontent(self,url):
177 Headers = {"User-Agent":"Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; en) Presto/2.8.131 Version/11.11"}
178 request = urllib2.Request(url.encode('utf8'),headers = Headers)
179 response = urllib2.urlopen(request)
180 try:
181 response = urllib2.urlopen(request,timeout=3)
182 except:
183 self.log.error(u'返回 URL: %s 数据失败' % url)
184 return ''
185 else:
186 self.log.info(u'返回URL: %s 数据成功' % url)
187 return response.read()
188
189 def getresponsecontent_by_proxy(self,url):
190 Headers = {"User-Agent":"Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; en) Presto/2.8.131 Version/11.11"}
191 request = urllib2.Request(url.encode('utf8'),headers = Headers)
192 proxy = random.choice(self.proxylist)
193 server = proxy[2].lower() + r'://' + proxy[0] + ':' + proxy[1]
194 self.log.info(u'使用代理服务器 %s 访问 %s' % (server,url))
195 opener = urllib2.build_opener(urllib2.ProxyHandler({proxy[2].lower():server}))
196 urllib2.install_opener(opener)
197 try:
198 response = urllib2.urlopen(request,timeout=3)
199 except:
200 self.log.error(u'返回 URL: %s 数据失败' % url)
201 return ''
202 else:
203 self.log.info(u'返回URL: %s 数据成功' % url)
204 return response.read()
205
206 if __name__ == '__main__':
207 GetInfor()
208
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