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
