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PicDownloader.py
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PicDownloader.py
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#!usr/bin/python
# -*- coding: UTF-8 -*-
#python3.x
# ------ 模块 ------
from random import Random #随机数
import re #正则表达式
import urllib.request #http模块
import http.cookiejar #http-cookie模块
import socket #网络编程模块
import os #操作系统模块
import datetime, time #日期时间模块
try:
import chardet # html内容分析模块
except ImportError as e:
chardetSupport = False
else:
chardetSupport = False
try:
import concurrent.futures #Python3.2+ 线程池模块
except ImportError as e:
#print (e)
import threading #多线程模块
poolSupport = False
else:
poolSupport = True
# ------ 全局变量 ------
# 打印日志
printLogEnabled = False
# 是否采集html
collectHtmlEnabled = False
# 网络超时设置 timeout in seconds
timeout = 15
socket.setdefaulttimeout(timeout)
#线程池大小
thePoolSize = 10
# ------ 伪装为浏览器 ---
def makeOpener(head={
'Connection': 'Keep-Alive',
'Accept': 'text/html, application/xhtml+xml, */*',
'Accept-Language': 'zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2',
'Connection': 'keep-alive',
'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:57.0) Gecko/20100101 Firefox/57.0'
}):
cj = http.cookiejar.CookieJar()
opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
header = []
for key, value in head.items():
elem = (key, value)
header.append(elem)
opener.addheaders = header
return opener
# ------ 获取网页源代码 ---
# url 网页链接地址
def getHtml(url):
# print('url='+url)
oper = makeOpener()
if oper is not None:
page = oper.open(url)
#print ('-----oper----')
else:
req=urllib.request.Request(url)
# 爬虫伪装浏览器
req.add_header('User-Agent','Mozilla/5.0 (Windows NT 6.1; WOW64; rv:57.0) Gecko/20100101 Firefox/57.0')
page = urllib.request.urlopen(req)
html = page.read()
if collectHtmlEnabled: #是否采集html
with open('html.txt', 'wb') as f:
f.write(html) # 采集到本地文件，来分析
# ------ 修改html对象内的字符编码为UTF-8 ------
if chardetSupport:
cdt = chardet.detect(html)
charset = cdt['encoding'] #用chardet进行内容分析
else:
charset = 'utf8'
try:
result = html.decode(charset)
except:
result = html.decode('gbk')
return result
# ------ 固定长度的随机字符串 ---
def random_str(randomlength=8,chars='AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789'):
str = ''
length = len(chars) - 1
random = Random()
for i in range(randomlength):
str+=chars[random.randint(0, length)]
return str
# ------ 根据图片url下载图片 ------
# folderPath 定义图片存放的目录 imgUrl 一个图片的链接地址 index 索引，表示第几个图片
def downloadImg(folderPath, imgUrl, index):
# ------ 异常处理 ------
try:
imgContent = (urllib.request.urlopen(imgUrl)).read()
except urllib.error.URLError as e:
if printLogEnabled : print ('【错误】当前图片无法下载')
return False
except urllib.error.HTTPError as e:
if printLogEnabled : print ('【错误】当前图片下载异常')
return False
else:
imgeNameFromUrl = os.path.basename(imgUrl)
if printLogEnabled : print ('正在下载第'+str(index+1)+'张图片，图片地址:'+str(imgUrl))
# ------ IO处理 ------
isExists=os.path.exists(folderPath)
if not isExists: # 目录不存在，则创建
os.makedirs( folderPath )
#print ('创建目录')
# 图片名命名规则，随机字符串
imgName = imgeNameFromUrl
if len(imgeNameFromUrl) < 8:
imgName = random_str(4) + random_str(1,'123456789') + random_str(2,'0123456789')+"_" + imgeNameFromUrl
filename= folderPath + "\\"+str(imgName)+".jpg"
try:
with open(filename, 'wb') as f:
f.write(imgContent) # 写入本地磁盘
# if printLogEnabled : print ('下载完成第'+str(index+1)+'张图片')
except :
return False
return True
# ------ 批量下载图片 ------
# folderPath 定义图片存放的目录 imgList 多个图片的链接地址
def downloadImgList(folderPath, imgList):
index = 0
# print ('poolSupport='+str(poolSupport))
if not poolSupport:
#print ('多线程模式')
# ------ 多线程编程 ------
threads = []
for imgUrl in imgList:
# if printLogEnabled : print ('准备下载第'+str(index+1)+'张图片')
threads.append(threading.Thread(target=downloadImg,args=(folderPath,imgUrl,index,)))
index += 1
for t in threads:
t.setDaemon(True)
t.start()
t.join() #父线程，等待所有线程结束
if len(imgList) >0 : print ('下载结束，存放图片目录：' + str(folderPath))
else:
#print ('线程池模式')
# ------ 线程池编程 ------
futures = []
# 创建一个最大可容纳N个task的线程池 thePoolSize 为 全局变量
with concurrent.futures.ThreadPoolExecutor(max_workers=thePoolSize) as pool:
for imgUrl in imgList:
# if printLogEnabled : print ('准备下载第'+str(index+1)+'张图片')
futures.append(pool.submit(downloadImg, folderPath, imgUrl, index))
index += 1
result = concurrent.futures.wait(futures, timeout=None, return_when='ALL_COMPLETED')
suc = 0
for f in result.done:
if f.result(): suc +=1
print('下载结束，总数：'+str(len(imgList))+'，成功数：'+str(suc)+'，存放图片目录：' + str(folderPath))
# ------ 下载百度帖子内所有图片 ------
# folderPath 定义图片存放的目录 url 百度贴吧链接
def downloadImgFromBaidutieba(folderPath='tieba', url='https://tieba.baidu.com/p/5256331871'):
html = getHtml(url)
# ------ 利用正则表达式匹配网页内容找到图片地址 ------
#reg = r'src="(.*?\.jpg)"'
reg = r'src="(.*?/sign=.*?\.jpg)"'
imgre = re.compile(reg);
imgList = re.findall(imgre, html)
print ('找到图片个数：' + str(len(imgList)))
# 下载图片
if len(imgList) >0 : downloadImgList(folderPath, imgList)
# ------ 搜索关键字并下载百度图片 ------
# folderPath 定义图片存放的目录 keyword 搜索的关键字
def downloadImgFromBaiduimage(folderPath='baiduimage', keyword='python'):
w = urllib.request.quote(keyword)
url = 'http://image.baidu.com/search/flip?tn=baiduimage&ie=utf-8&word='+w+'&ct=201326592&v=flip'
html = getHtml(url)
# ------ 利用正则表达式匹配网页内容找到图片地址 ------
imgList = re.findall('"objURL":"(.*?)",',html,re.S)
print ('找到图片个数：' + str(len(imgList)) )
# 下载图片
if len(imgList) >0 : downloadImgList(folderPath, imgList)
# ------ 爬虫搜索并下载美女图片地址：http://huaban.com ------
# folderPath 定义图片存放的目录
def downloadImgFromhuaban(folderPath='huaban'):
url='http://huaban.com/favorite/beauty/'
html = getHtml(url)
# ------ 利用正则表达式匹配网页内容找到图片地址 ------
# "file":{"farm":"farm1", "bucket":"hbimg", "key":"f56166cc72c040ad73574366a26cd15f2f4268b734c18-yVcNOl", "type":"image/jpeg", "width":658, "height":987, "frames":1}
url_re=re.compile(r'"key":"(.+?)"')
imgKeyList = url_re.findall(html)
imgList = []
for key in imgKeyList:
imgList.append('http://img.hb.aicdn.com/' + key)
print ('找到图片个数：' + str(len(imgList)) )
# 下载图片
if len(imgList) >0 : downloadImgList(folderPath, imgList)
# 程序入口
if __name__ == '__main__':
now = datetime.datetime.now().strftime('%Y-%m-%d %H-%M-%S')
#搜索关键字并下载百度图片
word = u'皮卡丘'
#downloadImgFromBaiduimage('baiduimage\\'+word+'\\' + now, word)
# 下载百度帖子内所有图片
downloadImgFromBaidutieba('tieba\\'+now, 'https://tieba.baidu.com/p/5256331871')
# 爬虫搜索并下载美女图片地址：http://huaban.com
# downloadImgFromhuaban('huaban\\'+now)