shell及Python爬虫实例展示

1.shell爬虫实例:

[root@db01 ~]# vim pa.sh 
#!/bin/bash
www_link=http://www.cnblogs.com/clsn/default.html?page=
for i in  {1..8}
do
a=`curl ${www_link}${i} 2>/dev/null|grep homepage|grep -v "ImageLink"|awk -F "[><"]" '{print $7"@"$9}' >>bb.txt`#@为自己
指定的分隔符.这行是获取内容及内容网址
done
egrep -v "pager" bb.txt >ma.txt #将处理后，只剩内容和内容网址的放在一个文件里
b=`sed  "s# ##g" ma.txt`   #将文件里的空格去掉，因为for循环会将每行的空格前后作为两个变量，而不是一行为一个变量，这个坑花
了我好长时间。
for i in $b
do
  c=`echo $i|awk -F @ '{print $1}'` #c=内容网址
  d=`echo $i|awk -F @ '{print $2}'` #d=内容
  echo "<a href='${c}' target='_blank'>${d}</a> " >>cc.txt #cc.txt为生成a标签的文本
done

爬虫结果显示：归档文件中惨绿少年的爬虫结果

 注意：爬取结果放入博客应在a标签后加的空格符或其他，博客园默认不显示字符串

2、

2.1Python爬虫学习

爬取这个网页

import urllib.request
# 网址
url = "http://10.0.0.6/"
# 请求
request = urllib.request.Request(url)
# 爬取结果
response = urllib.request.urlopen(request)
data = response.read()
# 设置解码方式
data = data.decode('utf-8')
# 打印结果
print(data)

　　结果：

E:pythonpythonpython.exe C:/python/day2/test.py
<html>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<body>
<h1>魔降风云变的第一个标题</h1>
<p>魔降风云变的第一个段落。</p>
</body>
</html>
print(type(response))

　　结果：

<class 'http.client.HTTPResponse'>
print(response.geturl())

　　结果：

http://10.0.0.6/
print(response.info())

　　结果：

Server: nginx/1.12.2
Date: Fri, 02 Mar 2018 07:45:11 GMT
Content-Type: text/html
Content-Length: 184
Last-Modified: Fri, 02 Mar 2018 07:38:00 GMT
Connection: close
ETag: "5a98ff58-b8"
Accept-Ranges: bytes
print(response.getcode())

　　结果:

200

2.2爬取网页代码并保存到电脑文件

import urllib.request
# 网址
url = "http://10.0.0.6/"
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) '
                         'Chrome/51.0.2704.63 Safari/537.36'}
req = urllib.request.Request(url=url, headers=headers)
res = urllib.request.urlopen(req)
data = res.read()
data = data.decode('utf-8')
# 打印抓取的内容
print(data)

　　结果：

<html>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<body>
<h1>魔降风云变的第一个标题</h1>
<p>魔降风云变的第一个段落。</p>
</body>
</html>
import urllib.request
# 定义保存函数                               
def saveFile(data):  #------------------------------------------
    path = "E:\content.txt"
    f = open(path, 'wb')
    f.write(data)
    f.close()        #------------------------------------------
# 网址
url = "http://10.0.0.6/"
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) '
                         'Chrome/51.0.2704.63 Safari/537.36'}
req = urllib.request.Request(url=url, headers=headers)
res = urllib.request.urlopen(req)
data = res.read()
# 也可以把爬取的内容保存到文件中
saveFile(data)        #******************************************
data = data.decode('utf-8')
# 打印抓取的内容
print(data)

　　添加保存文件的函数并执行的结果：

# # 打印爬取网页的各类信息
print(type(res))
print(res.geturl())
print(res.info())
print(res.getcode())

　　结果：

<class 'http.client.HTTPResponse'>
http://10.0.0.6/
Server: nginx/1.12.2
Date: Fri, 02 Mar 2018 08:09:56 GMT
Content-Type: text/html
Content-Length: 184
Last-Modified: Fri, 02 Mar 2018 07:38:00 GMT
Connection: close
ETag: "5a98ff58-b8"
Accept-Ranges: bytes


200

 2.3爬取图片

import urllib.request, socket, re, sys, os
# 定义文件保存路径
targetPath = "E:\"
def saveFile(path):
    # 检测当前路径的有效性
    if not os.path.isdir(targetPath):
        os.mkdir(targetPath)

        # 设置每个图片的路径
    pos = path.rindex('/')
    t = os.path.join(targetPath, path[pos + 1:])
    return t
# 用if __name__ == '__main__'来判断是否是在直接运行该.py文件
# 网址
url = "http://10.0.0.6/"
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) '                            'Chrome/51.0.2704.63 Safari/537.36'
}
req = urllib.request.Request(url=url, headers=headers)
res = urllib.request.urlopen(req)
data = res.read()
print(data)
for link, t in set(re.findall(r'(http:[^s]*?(jpg|png|gif))', str(data))):
    print(link)
    try:
        urllib.request.urlretrieve(link, saveFile(link))
    except:
        print('失败')

　  2.31

import urllib.request, socket, re, sys, os
url = "http://10.0.0.6/"
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) '                            'Chrome/51.0.2704.63 Safari/537.36'
}
req = urllib.request.Request(url=url, headers=headers)
res = urllib.request.urlopen(req)
data = res.read()
print(req)
print(res)
print(data)
print(str(data))

　　结果：

<urllib.request.Request object at 0x0000000001ECD9E8>
<http.client.HTTPResponse object at 0x0000000002D1B128>
b'<html>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<body>
<img src="http://10.0.0.6/ma1.png" />
<img src="http://10.0.0.6/ma2.jpg" />
<h1>xe9xadx94xe9x99x8dxe9xa3x8exe4xbax91xe5x8fx98xe7x9ax84xe7xacxacxe4xb8x80xe4xb8xaaxe6xa0x87xe9xa2x98</h1>
<p>xe9xadx94xe9x99x8dxe9xa3x8exe4xbax91xe5x8fx98xe7x9ax84xe7xacxacxe4xb8x80xe4xb8xaaxe6xaexb5xe8x90xbdxe3x80x82</p>
</body>
</html>
'
b'<html>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<body>
<img src="http://10.0.0.6/ma1.png" />
<img src="http://10.0.0.6/ma2.jpg" />
<h1>xe9xadx94xe9x99x8dxe9xa3x8exe4xbax91xe5x8fx98xe7x9ax84xe7xacxacxe4xb8x80xe4xb8xaaxe6xa0x87xe9xa2x98</h1>
<p>xe9xadx94xe9x99x8dxe9xa3x8exe4xbax91xe5x8fx98xe7x9ax84xe7xacxacxe4xb8x80xe4xb8xaaxe6xaexb5xe8x90xbdxe3x80x82</p>
</body>
</html>
'

    2.32

import urllib.request, socket, re, sys, os
url = "http://10.0.0.6/"
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) '                            'Chrome/51.0.2704.63 Safari/537.36'
}
req = urllib.request.Request(url=url, headers=headers)
res = urllib.request.urlopen(req)
data = res.read()
for link in set(re.findall(r'(http:[^s]*?(jpg|png|gif))', str(data))):
   print(link)

　　结果：

('http://10.0.0.6/ma2.jpg', 'jpg')
('http://10.0.0.6/ma1.png', 'png')

   2.33

for link,t in set(re.findall(r'(http:[^s]*?(jpg|png|gif))', str(data))):
   print(link)

　　结果：

http://10.0.0.6/ma1.png
http://10.0.0.6/ma2.jpg

2.34

import urllib.request, socket, re, sys, os
# 定义文件保存路径
targetPath = "E:\"
def saveFile(path):
    # 检测当前路径的有效性
    if not os.path.isdir(targetPath):
        os.mkdir(targetPath)

        # 设置每个图片的路径
    pos = path.rindex('/')
    t = os.path.join(targetPath, path[pos + 1:])
    return t
# 用if __name__ == '__main__'来判断是否是在直接运行该.py文件
# 网址
url = "http://10.0.0.6/"
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) '                            'Chrome/51.0.2704.63 Safari/537.36'
}
req = urllib.request.Request(url=url, headers=headers)
res = urllib.request.urlopen(req)
data = res.read()
for link,t in set(re.findall(r'(http:[^s]*?(jpg|png|gif))', str(data))):
   print(link)
   try:
       urllib.request.urlretrieve(link, saveFile(link))
   except:
       print('失败')

　　  结果：

http://10.0.0.6/ma2.jpg
http://10.0.0.6/ma1.png

2.4登录知乎

 参考：http://blog.csdn.net/fly_yr/article/details/51535676

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原文地址：https://www.cnblogs.com/machangwei-8/p/8469698.html