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阳光采购平台每月初会把当月的价格挂到平台上，现模拟用户登录平台，将需要的数据保存到csv文件和数据库，并且发送给指定人员。python初学者，遇见很多坑，这里记录一下。
| 环境 | python2.7 |
| 开发工具 | pycharm |
| 运行环境 | centos7 |
| 运行说明 | 设置定时任务每月1号凌晨1点执行这个python代码 |
| 实现功能 | 根据账号密码及解析处理的验证码自动登录系统，解析需要的数据，并保存在csv文件和mysql数据库中，爬取完成后将csv文件发给指定的人。支持请求断开后自动重连。 |
开发环境搭建：
网上教程一大堆，不赘述了。安装好后需要安装一些必须的库，如下：
bs4(页面html解析)
csv(用于保存csv文件)
smtplib(用于发送邮件)
mysql.connector(用于连接数据库)
部分需要下载的内容我放在网盘共享,包括leptonica-1.72.tar.gz，tesseract3.04.00.tar.gz，以及语言包：
链接：https://pan.baidu.com/s/1j4szdgmn6dpuq1ehxe6zkw
提取码：crbl
图像识别：
网上也有很多教程，整理了一版在centos7上能正常安装图像识别库的操作步骤。
yum install gcc gcc-c++ make
yum install autoconf automake libtool
yum install libjpeg-devel libpng-devel libtiff-devel zlib-devel
下载地址：
#到leptonica的目录执行
./configure
make
make install
下载地址：https://link.jianshu.com/?t=https://github.com/tesseract-ocr/tesseract/wiki/downloads
#到tesseract-3.04.00目录执行
./autogen.sh
./configure
make
make install
ldconfig
下载地址：
下载后的文件放在目录tessdata下面
拷贝tessdata：cp tessdata /usr/local/share –r
修改环境变量：
打开配置文件：vi /etc/profile
添加一行：export tessdata_prefix=/usr/local/share/tessdata
生效：source /etc/profile
tesseract –v 查看tesseract的版本相关信息。如果没有报错，那么表示安装成功了。
放入找到一张图片image.png，然后执行:tesseract image.png 123
当前目录下会生成123.txt文件，这个文件就记录了识别的文字。
这个库是用于在python代码里面调用tesseract
命令：pip install pytesseract
测试代码如下：
我要评论1 import pytesseract
2 from pil import image
3
4 im1=image.open('image.png')
5 print(pytesseract.image_to_string(im1))
代码：
我要获取的数据长相如下：
首先获取一共有多少页，循环访问每一页，将每一页数据保存到csv和数据库里面，如果在访问某页的时候抛出异常，那么记录当前broken页数，重新登录，从broken那页继续爬取数据。
写了一个gl.py,用于保存全局变量：
1 #!/usr/bin/python
2 # -*- coding: utf-8 -*-
3 #coding=utf-8
4 import time
5
6 timestr = time.strftime('%y%m%d', time.localtime(time.time()))
7 monthstr = time.strftime('%m', time.localtime(time.time()))
8 yearstr = time.strftime('%y', time.localtime(time.time()))
9 log_file = "log/" + timestr + '.log'
10 csvfilename = "csv/" + timestr + ".csv"
11 filename = timestr + ".csv"
12 fmt = '%(asctime)s - %(filename)s:%(lineno)s - %(message)s'
13 loginurl = "http://yourpath/login.aspx"
14 producturl = 'http://yourpath/aaa.aspx'
15 username = 'aaaa'
16 password = "aaa"
17 precodeurl = "yourpath"
18 host="yourip"
19 user="aaa"
20 passwd="aaa"
21 db="mysql"
22 charset="utf8"
23 postdata={
24 '__viewstate':'',
25 '__eventtarget':'',
26 '__eventargument':'',
27 'btnlogin':"登录",
28 'txtuserid':'aaaa',
29 'txtuserpwd':'aaa',
30 'txtcode':'',
31 'hfip':'yourip'
32 }
33 tdd={
34 '__viewstate':'',
35 '__eventtarget':'ctl00$contentplaceholder1$aspnetpager1',
36 'ctl00$contentplaceholder1$aspnetpager1_input':'1',
37 'ctl00$contentplaceholder1$aspnetpager1_pagesize':'50',
38 'ctl00$contentplaceholder1$txtyear':'',
39 'ctl00$contentplaceholder1$txtmonth':'',
40 '__eventargument':'',
41 }
42 vs={
43 '__viewstate':''
44 }
主代码中设置日志，csv，数据库连接，cookie：
1 handler = logging.handlers.rotatingfilehandler(gl.log_file, maxbytes=1024 * 1024, backupcount=5)
2 formatter = logging.formatter(gl.fmt)
3 handler.setformatter(formatter)
4 logger = logging.getlogger('tst')
5 logger.addhandler(handler)
6 logger.setlevel(logging.debug)
7 csvfile = codecs.open(gl.csvfilename, 'w+', 'utf_8_sig')
8 writer = csv.writer(csvfile)
9 conn = mysql.connector.connect(host=gl.host, user=gl.user, passwd=gl.passwd, db=gl.db, charset=gl.charset)
10 cursor = conn.cursor()
11
12 cookiejar = cookielib.mozillacookiejar()
13 cookiesupport = urllib2.httpcookieprocessor(cookiejar)
14 httpshandler = urllib2.httpshandler(debuglevel=0)
15 opener = urllib2.build_opener(cookiesupport, httpshandler)
16 opener.addheaders = [('user-agent','mozilla/5.0 (windows nt 6.1) applewebkit/537.11 (khtml, like gecko) chrome/23.0.1271.64 safari/537.11')]
17 urllib2.install_opener(opener)
登录方法：
首先是识别验证码，转为数字。然后用(密码+用户名+验证)提交到登录方法，可能会失败，因为识别验证码有时候识别的不正确。如果登录失败，那么重新获取验证码，再次识别，再次登录，直到登录成功。
1 def get_logined_data(opener,logger,views):
2 print "get_logined_data"
3 indexcount = 1
4 retdata = none
5 while indexcount <= 15:
6 print "begin login ", str(indexcount), " time"
7 logger.info("begin login " + str(indexcount) + " time")
8 vrifycodeurl = gl.precodeurl + str(random.random())
9 text = get_image(vrifycodeurl)#封装一个方法，传入验证码url，返回识别出的数字
10 postdata = gl.postdata
11 postdata["txtcode"] = text
12 postdata["__viewstate"]=views
13
14
15 data = urllib.urlencode(postdata)
16 try:
17 headers22 = {
18 'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3',
19 'accept-encoding': 'gzip, deflate, br',
20 'accept-language': 'zh-cn,zh;q=0.9',
21 'connection': 'keep-alive',
22 'content-type': 'application/x-www-form-urlencoded',
23 'user-agent': 'mozilla/5.0 (windows nt 10.0; wow64) applewebkit/537.36 (khtml, like gecko) chrome/74.0.3729.131 safari/537.36'
24 }
25 request = urllib2.request(gl.loginurl, data, headers22)
26 opener.open(request)
27 except exception as e:
28 print "catch exception when login"
29 print e
30
31 request = urllib2.request(gl.producturl)
32 response = opener.open(request)
33 datapage = response.read().decode('utf-8')
34
35 bsobj = beautifulsoup(datapage,'html.parser')
36 tabcontent = bsobj.find(id="tabcontent") #登录成功后，页面才有tabcontent这个元素，所以更具这个来判断是否登录成功
37 if (tabcontent is not none):
38 print "login succesfully"
39 logger.info("login succesfully")
40 retdata = bsobj
41 break
42 else:
43 print "enter failed,try again"
44 logger.info("enter failed,try again")
45 time.sleep(3)
46 indexcount += 1
47 return retdata
分析代码发现，每次请求获取数据都需要带上’__viewstate’这个参数，这个参数是存放在页面，所以需要把‘__viewstate’提出出来，用于访问下一页的时候带到参数里面去。
验证码解析：
通过验证码的url地址，将验证码保存到本地，因为验证码是彩色的，所有需要先把验证码置灰，然后再调用图像识别转为数字。这个验证码为4位数字，但是调用图像识别的时候，可能会转成字母，所有手动将字母转为数字，转换后识别率还能接受。
1 #获取验证码对应的数字，返回为4个数字才为有效
2 def get_image(codeurl):
3 print(time.strftime('%y-%m-%d %h:%m:%s',time.localtime(time.time())) + " begin get code num")
4 index = 1
5 while index<=15:
6 file = urllib2.urlopen(codeurl).read()
7 im = cstringio.stringio(file)
8 img = image.open(im)
9 imgname = "vrifycode/" + gl.timestr + "_" + str(index) + ".png"
10 print 'begin get vrifycode'
11 text = convert_image(img, imgname)
12 print "vrifycode", index, ":", text
13 # logger.info('vrifycode' + str(index) + ":" + text)
14
15 if (len(text) != 4 or text.isdigit() == false): # 如果验证码不是4位那么肯定是错误的。
16 print 'vrifycode:', index, ' is wrong'
17 index += 1
18 time.sleep(2)
19 continue
20 return text
21
22 #将图片转为数字
23 def convert_image(image,impname):
24 print "enter convert_image"
25 image = image.convert('l') # 灰度
26 image2 = image.new('l', image.size, 255)
27 for x in range(image.size[0]):
28 for y in range(image.size[1]):
29 pix = image.getpixel((x, y))
30 if pix < 90: # 灰度低于120 设置为 0
31 image2.putpixel((x, y), 0)
32 print "begin save"
33 image2.save(impname) # 将灰度图存储下来看效果
34 print "begin convert"
35 text = pytesseract.image_to_string(image2)
36 print "end convert"
37 snum = ""
38 for j in text:#进行简单转换
39 if (j == 'z'):
40 snum += "2"
41 elif (j == 't'):
42 snum += "7"
43 elif (j == 'b'):
44 snum += "5"
45 elif (j == 's'):
46 snum += "8"
47 elif (j == 's'):
48 snum += "8"
49 elif (j == 'o'):
50 snum += "0"
51 elif (j == 'o'):
52 snum += "0"
53 else:
54 snum += j
55 return snum
数据转换：
将html数据转换为数组，供保存csv文件和数据库时使用
1 def paras_data(namelist,logger):
2 data = []
3 mainlist = namelist
4 rows = mainlist.findall("tr", {"class": {"row", "alter"}})
5 try:
6 if (len(rows) != 0):
7 for name in rows:
8 tds = name.findall("td")
9 if tds == none:
10 print "get tds is null"
11 logger.info("get tds is null")
12 else:
13 item = []
14 for index in range(len(tds)):
15 s_span = (tds[index]).find("span")
16 if (s_span is not none):
17 tmp = s_span["title"]
18 else:
19 tmp = (tds[index]).get_text()
20 # tmp=(tds[index]).get_text()
21 item.append(tmp.encode('utf-8')) # gb2312 utf-8
22 item.append(datetime.datetime.now().strftime('%y-%m-%d %h:%m:%s'))#本条数据获取时间
23 data.append(tuple(item))
24
25 except exception as e:
26 print "catch exception when save csv", e
27 logger.info("catch exception when save csv" + e.message)
28 return data
保存csv文件：
def save_to_csv(data ,writer):
for d in data:
if d is not none:
writer.writerow(d)
保存数据库：
1 def save_to_mysql(data,conn,cursor): 2 try: 3 cursor.executemany( 4 "insert into `aaa`(aaa,bbb) values (%s,%s)", 5 data) 6 conn.commit() 7 8 except exception as e: 9 print "catch exception when save to mysql",e 10 else: 11 pass
保存指定页数据：
1 def get_appointed_page(snum,opener,vs,logger):
2 tdd = get_tdd()
3 tdd["__viewstate"] = vs['__viewstate']
4 tdd["__eventargument"] = snum
5 tdd=urllib.urlencode(tdd)
6 # print "tdd",tdd
7 op = opener.open(gl.producturl, tdd)
8 if (op.getcode() != 200):
9 print("the" + snum + " page ,state not 200,try connect again")
10 return none
11 data = op.read().decode('utf-8', 'ignore')
12 # print "data",data
13 bsobj = beautifulsoup(data,"lxml")
14 namelist = bsobj.find("table", {"class": "mainlist"})
15 # print "namelist",namelist
16 if len(namelist) == 0:
17 return none
18 viewstate = bsobj.find(id="__viewstate")
19 if viewstate is none:
20 logger.info("the other page,no viewstate,try connect again")
21 print("the other page,no viewstate,try connect again")
22 return none
23 vs['__viewstate'] = viewstate["value"]
24 return namelist
main方法：
1 while flag == true and logintime <50:
2 try:
3 print "global login the ", str(logintime), " times"
4 logger.info("global login the " + str(logintime) + " times")
5 bsobj = get_logined_data(opener, logger,views)
6 if bsobj is none:
7 print "try login 15 times,but failed,exit"
8 logger.info("try login 15 times,but failed,exit")
9 exit()
10 else:
11 print "global login the ", str(logintime), " times succesfully!"
12 logger.info("global login the " + str(logintime) + " times succesfully!")
13 viewstate_source = bsobj.find(id="__viewstate")
14 if totalnum == -1:
15 totalnum = get_totalnum(bsobj)
16 print "totalnum:",str(totalnum)
17 logger.info("totalnum:"+str(totalnum))
18 vs = gl.vs
19 if viewstate_source != none:
20 vs['__viewstate'] = viewstate_source["value"]
21
22 # 获取指定snum页的数据
23 # while snum<=totalnum:
24 while snum<=totalnum:
25 print "begin get the ",str(snum)," page"
26 logger.info("begin get the "+str(snum)+" page")
27 namelist = get_appointed_page(snum, opener, vs, logger)
28 if namelist is none:
29 print "get the namelist failed,connect agian"
30 logger.info("get the namelist failed,connect agian")
31 raise exception
32 else:
33 print "get the ", str(snum), " successfully"
34 logger.info("get the " + str(snum) + " successfully")
35
36
37 mydata = paras_data(namelist,logger)
38 #保存csv文件
39 save_to_csv(mydata, snum, writer)
40 #保存到数据库
41 save_to_mysql(mydata, conn, cursor)
42
43 snum+=1
44 time.sleep(3)
45
46 flag = false
47 except exception as e:
48 logintime+=1
49 print "catch exception",e
50 logger.error("catch exception"+e.message)
定时任务设置：
cd /var/spool/cron/
crontab –e#编辑定时任务
输入：1 1 1 * * /yourpath/normal_script.sh>>/yourpath/cronlog.log 2>&1
（上面定时任务的意思是每月1号1点1分执行文件normal_script.sh，日志存放在cronlog.log）
目录结构：
源码下载：helloworld.zip
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