本程序可以根据时间要求获取某华网上不同模块的新闻内容，时间要求包括设置截止日期，以及时间间隔，比如说获取距离2023-04-20一天以内的新闻。主要使用了selenium有关的爬虫技术，具体实现如下：
目录
目录
一、SpiderXinhua类的基础属性
二、日期获取与格式转换的函数timeinhref
三、 得到可用的网页链接need_hrefget
四、单模块新闻获取xinhua_onemokuai_urlsget
五、循环每个模块xinhuawangurlsget
六、其余函数
七、执行示例
一、SpiderXinhua类的基础属性
程序被封装为一个类SpiderXinhua，此类中相关属性如下：
xinhua_url_base0 = "http://www.news.cn"
#各个模块的链接
xinhua_url_lists = {
}
#代理信息
user_agent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36"
headers = {
"user-agent": user_agent
}
#错误提示信息
Xinhua_errormessage = []
#可用的url
Need_url = []
# 当天日期
# 查看更多
LookmoreBtn = "//div[contains(@class,'xpage-more-btn')]"
#xpath信息
# 军事
Xpath_army = "//ul[contains(@class,'army_list')]//div[@class='tit']/a/@href"
Xpath_army_spide = "//div[@class='swiper-wrapper']/div[not(contains(@class,'swiper-slide-duplicate'))]//p[@class='name']/a/@href"
# 列表
Xpath_t_start = "//div[@class='item item-style1']["
Xpath_t_end = "]/div[@class='txt']/div[@class='info clearfix domPc']/div[contains(@class,'time')]/text()"
Xpath_h_start = Xpath_t_start
Xpath_h_end = "]//div[@class='tit']//a/@href"
# 教育
Xpath_Jt_start = "//div["
Xpath_Jt_end = "]/div/div[@class='item item-style1']/div[@class='txt']/div[@class='info clearfix domPc']/div[@class='time']/text()"
Xpath_Jh_start = Xpath_Jt_start
Xpath_Jh_end = "]/div/div[@class='item item-style1']/div[@class='txt']/div[@class='tit']/a/@href"
# 特殊列表
Xpath_Ft_start = "//li[@class='item item-style2']["
Xpath_Ft_end = "]/div[@class='info clearfix domPc']/div[@class='time']/text()"
Xpath_Fh_start = Xpath_Ft_start
Xpath_Fh_end = "]/div[@class='tit']//a/@href"
# 轮播
Xpath_info_spide = "//div[contains(@class,'swiper-slide')]/div[@class='tit']//a/@href"
Xpath_spidenum = "//span[@class='swiper-pagination-total']/text()"
# 体育
Xpath_sports = "//div[@class='mcon']//a/@href"
#selenium
option = webdriver.ChromeOptions()
option.add_argument("headless")
path = 'chromedriver.exe'
browswe = webdriver.Chrome(executable_path=path, chrome_options=option)当然，代码中的xpath的信息是根据对相关模块的具体信息得到的，也可以根据新的页面信息自行构造出xpath。
二、日期获取与格式转换的函数timeinhref
通过对新华网上网页链接的观察，可以发现这些url可以以/c.html或者/c.htm结尾，或者是以/c_10个数字.htm的形式结尾，不同的格式中，其日期信息位置不同，因为我们需要提取存在于链接中的日期信息，因此需要对不同样式的url进行不同的处理，具体如下所示：
'''日期获取与格式转换'''
def timeinhref(self,news_href):
new_date_date = datetime.datetime(1900, 1, 1).date()
#news_href存在才执行下面的程序，减少了程序出bug的情况
if news_href:
#判断程序是以/c.html结尾还是以/c.htm结尾或者是其他形式
if str(news_href).endswith("/c.html") or str(news_href).endswith("/c.htm"):
get_date = str(news_href).split("/")[-3]
new_date_date = datetime.datetime(int(get_date[0:4]), int(get_date[4:6]), int(get_date[6:])).date()
else:
if re.search('^c_[0-9]{10}.htm$', str(news_href).split("/")[-1]) or re.search('^c_[0-9]{10}.html$', str(news_href).split("/")[-1]):
smalllist = str(news_href).split("/")
get_ym = smalllist[-3]
get_d = smalllist[-2]
new_date_date = datetime.datetime(int(get_ym[0:4]), int(get_ym[5:]), int(get_d[0:])).date()
return new_date_date三、 得到可用的网页链接need_hrefget
我们最终需要的只是符合时间要求的新闻，因此仅保留符合要求的新闻的链接。根据xpath从页面上获取的url信息可能是不能直接访问的，因为它们不是以http://开头的，要加上"http://www.news.cn"方可访问
def need_hrefget(self,need_url, army_href):
if army_href:
for onehref in army_href:
if str(onehref).endswith(".htm") or str(onehref).endswith(".html"):
new_date_date = SpiderXinhua.timeinhref(self,onehref)
now_date = self.Now_date
daysub = (now_date - new_date_date).days + 1
#仅获得符合时间要求的新闻
if int(daysub) <= int(self.datesub):
#对不是以http://开头的url要加上"http://www.news.cn"方可访问
if str(onehref)[0:1] == "/":
onehref = SpiderXinhua.xinhua_url_base0 + str(onehref)
need_url.append(onehref)
print(onehref)
else:
break
else:
continue四、单模块新闻获取xinhua_onemokuai_urlsget
对于一些模块，可能有轮播的新闻，也有列表的新闻。 新闻以列表形式存在，不断逐个获取连接，直到当前新闻链接的时间信息不符合要求；如果需要点击查看更多按钮，则查看。
轮播的新闻按照设置的xpath得到，但注意个数，避免出现重复。
对于军事、体育等特殊模块单独执行。
对爬取出错的模块，提示失误信息。
'''单模块'''
def xinhua_onemokuai_urlsget(self,mokuaileibiename, mokuaileibieurl, need_url, xinhua_errormessage):
try:
# browswe = webdriver.Chrome(executable_path=path, chrome_options=option)
print(mokuaileibiename)
benciurl = mokuaileibieurl
SpiderXinhua.browswe.get(benciurl)
xinhua_url_base = "http://" + benciurl.split("/")[2]
content = SpiderXinhua.browswe.page_source
tree = etree.HTML(content)
# 军事
if mokuaileibiename == "军事":
xpath_army = SpiderXinhua.Xpath_army
army_href = tree.xpath(xpath_army)
if army_href:
SpiderXinhua.need_hrefget(self,need_url, army_href)
else:
xinhua_errormessage.append("新华网--军事列表数据获取失败，检查xpath是否正确!")
xpath_army_spide = SpiderXinhua.Xpath_army_spide
army_href_spide = tree.xpath(xpath_army_spide)
if army_href_spide:
SpiderXinhua.need_hrefget(self,need_url, army_href_spide)
else:
xinhua_errormessage.append("新华网--军事滚动数据获取失败，检查xpath是否正确!")
return
# 体育
if mokuaileibiename == "体育":
xpath_sports = SpiderXinhua.Xpath_sports
sports_href = tree.xpath(xpath_sports)
if sports_href:
del (sports_href[0])
SpiderXinhua.need_hrefget(self,need_url, sports_href)
else:
xinhua_errormessage.append("新华网--体育数据获取失败，检查xpath是否正确!")
return
# 轮播的新闻
xpath_info_spide = SpiderXinhua.Xpath_info_spide
xpath_spidenum = SpiderXinhua.Xpath_spidenum
news_href_duo = tree.xpath(xpath_info_spide)
spidenum = tree.xpath(xpath_spidenum)
news_href = []
if spidenum:
for i in range(int(spidenum[0])):
news_href.append(news_href_duo[i])
for i in range(len(news_href)):
if str(news_href[i]).endswith("/c.html") or str(news_href[i]).endswith("/c.htm"):
get_date = str(news_href[i]).split("/")[-3]
new_date_date = datetime.datetime(int(get_date[0:4]), int(get_date[4:6]),
int(get_date[6:])).date()
else:
if re.search('^c_[0-9]{10}.htm$', str(news_href[i]).split("/")[-1]):
smalllist = str(news_href[i]).split("/")
get_ym = smalllist[-3]
get_d = smalllist[-2]
new_date_date = datetime.datetime(int(get_ym[0:4]), int(get_ym[5:]), int(get_d[0:])).date()
else:
continue
daysub = (self.Now_date - new_date_date).days + 1
if int(daysub) <= int(self.datesub):
if str(news_href[i])[0:1] == "/":
news_href[i] = xinhua_url_base + str(news_href[i])
need_url.append(news_href[i])
print(news_href[i])
# 列表新闻
xpath_t_start = SpiderXinhua.Xpath_t_start
xpath_t_end = SpiderXinhua.Xpath_t_end
xpath_h_start = xpath_t_start
xpath_h_end = SpiderXinhua.Xpath_h_end
if mokuaileibiename == "教育":
xpath_t_start = SpiderXinhua.Xpath_Jt_start
xpath_t_end = SpiderXinhua.Xpath_Jt_end
xpath_h_start = xpath_t_start
xpath_h_end = SpiderXinhua.Xpath_Jh_end
numid = 1
tryerror = 0
goflag = True
#新闻以列表形式存在，不断逐个获取连接，直到当前新闻链接的时间信息不符合要求
#如果需要点击查看更多按钮，则查看
#goflag就是决定是否继续向下获取的
while goflag:
xpath_info_item_t = xpath_t_start + str(numid) + xpath_t_end
new_time = tree.xpath(xpath_info_item_t)
if not new_time:
if numid == 1 and tryerror == 0:
xpath_t_start = SpiderXinhua.Xpath_Ft_start
xpath_t_end = SpiderXinhua.Xpath_Ft_end
xpath_h_start = xpath_t_start
xpath_h_end = SpiderXinhua.Xpath_Fh_end
tryerror = tryerror + 1
continue
#查看更多
lookmore = SpiderXinhua.browswe.find_element(By.XPATH, SpiderXinhua.LookmoreBtn)
if lookmore:
lookmore.click()
time.sleep(2)
content = SpiderXinhua.browswe.page_source
tree = etree.HTML(content)
continue
goflag = False
xinhua_errormessage.append(
"新华网--" + str(mokuaileibiename) + "列表数据获取失败，检查xpath是否正确!")
new_date_date = datetime.datetime.strptime(new_time[0], "%Y-%m-%d").date()
daysub = (Now_date - new_date_date).days + 1
if daysub <= self.datesub:
xpath_info_item_h = xpath_h_start + str(numid) + xpath_h_end
news_href = tree.xpath(xpath_info_item_h)
if news_href:
if str(news_href[0])[0:1] == "/":
news_href[0] = xinhua_url_base + str(news_href[0])
if str(news_href[0])[0:3] == "../":
news_href[0] = xinhua_url_base + str(news_href[0])[2:]
need_url.append(news_href[0])
print(news_href[0])
numid = numid + 1
else:
goflag = False
except:
xinhua_errormessage.append("新华网--" + str(mokuaileibiename) + "数据获取失败，网页格式不符,可手动查看!")五、循环每个模块xinhuawangurlsget
'''循环每个模块'''
def xinhuawangurlsget(self,need_url, xinhua_errormessage):
SpiderXinhua.xinhua_threadlist = []
for ui in range(len(SpiderXinhua.xinhua_url_lists)):
mokuaileibiename = list(SpiderXinhua.xinhua_url_lists.keys())[ui]
mokuaileibieurl = list(SpiderXinhua.xinhua_url_lists.values())[ui]
SpiderXinhua.xinhua_onemokuai_urlsget(self,mokuaileibiename, mokuaileibieurl, need_url, xinhua_errormessage)
return need_url, xinhua_errormessage
六、其余函数
'''主要'''
def mainmain(self):
Need_url, Xinhua_errormessage = SpiderXinhua.xinhuawangurlsget(self,SpiderXinhua.Need_url, SpiderXinhua.Xinhua_errormessage)
self.Need_url=Need_url
self.Xinhua_errormessage=Xinhua_errormessage
def __init__(self,datesub,nowdate):
self.datesub=datesub
self.Now_date=nowdate
SpiderXinhua.mainmain(self)七、执行示例
设置时间间隔为1天，截止时间为当天日期
if __name__=="__main__":
Now_date = datetime.date.today()
axinhua=SpiderXinhua(1,Now_date)
print(len(axinhua.Need_url))
print(axinhua.Need_url)
print(axinhua.Xinhua_errormessage)
执行结果为：文章来源：https://www.toymoban.com/news/detail-794297.html
文章来源地址https://www.toymoban.com/news/detail-794297.html
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