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爬虫(Web Crawler)是一种自动化程序,用于从互联网上收集信息。其主要功能是访问网页、提取数据并存储,以便后续分析或展示。爬虫通常由搜索引擎、数据挖掘工具、监测系统等应用于网络数据抓取的场景。 爬虫的工作流程包括以下几个关键步骤: URL收集: 爬虫从一个或多个初始URL开始,递归或迭代地发现新的URL,构建一个URL队列。这些URL可以通过链接分析、站点地图、搜索引擎等方式获取。 请求网页: 爬虫使用HTTP或其他协议向目标URL发起请求,获取网页的HTML内容。这通常通过HTTP请求库实现,如Python中的Requests库。 解析内容: 爬虫对获取的HTML进行解析,提取有用的信息。常用的解析工具有正则表达式、XPath、Beautiful Soup等。这些工具帮助爬虫定位和提取目标数据,如文本、图片、链接等。 数据存储: 爬虫将提取的数据存储到数据库、文件或其他存储介质中,以备后续分析或展示。常用的存储形式包括关系型数据库、NoSQL数据库、JSON文件等。 遵守规则: 为避免对网站造成过大负担或触发反爬虫机制,爬虫需要遵守网站的robots.txt协议,限制访问频率和深度,并模拟人类访问行为,如设置User-Agent。 反爬虫应对: 由于爬虫的存在,一些网站采取了反爬虫措施,如验证码、IP封锁等。爬虫工程师需要设计相应的策略来应对这些挑战。 爬虫在各个领域都有广泛的应用,包括搜索引擎索引、数据挖掘、价格监测、新闻聚合等。然而,使用爬虫需要遵守法律和伦理规范,尊重网站的使用政策,并确保对被访问网站的服务器负责。
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医疗数据爬虫、简单病症分析及医疗资源推荐.zip (370个子文件)
Activity.acd 854B
.classpath 5KB
class.cld 794B
org.eclipse.wst.common.component 593B
org.eclipse.wst.jsdt.ui.superType.container 49B
stylesheet.css 13KB
.gitattributes 89B
.gitignore 10B
haodf_ganmao_DoctorDetails.html 159KB
haodf-Hos-List-sichuan-huaxi.html 146KB
医院-白内障-四川-多页.html 107KB
haodf-ganmao.html 94KB
医院-酒精中毒-四川-一页.html 80KB
医院-酒精中毒-福建-无数据.html 76KB
haodf-Hos-List-sichuan.html 54KB
CrawlDataBusiness.html 34KB
index-3.html 29KB
index-9.html 27KB
HaodfDao.html 26KB
DrmedDao.html 24KB
EnumdescField.html 24KB
index-14.html 23KB
HttpUtils.html 23KB
APIService.html 21KB
CommonCheckUtils.html 20KB
CrawlHaodfBusiness.html 20KB
DrmedServiceImpl.html 18KB
QueryDiseaseDataBusiness.html 18KB
QueryMatchServiceImpl.html 17KB
EnumAPI.html 17KB
overview-tree.html 17KB
Constant.html 17KB
IHaodfDao.html 16KB
HaodfService.html 16KB
StringUtils.html 16KB
DataWriteBusiness.html 16KB
index-7.html 16KB
BaseDaoImpl.html 16KB
Constant_Haodf.html 16KB
IDrmedDao.html 15KB
RebuildDataBaseBusiness.html 15KB
CrawlDataBusinessTest.html 15KB
HaodfServiceTest.html 15KB
headaches-adult.html 15KB
APIDao.html 15KB
index-16.html 14KB
QueryMatchServiceImplTest.html 14KB
index-18.html 14KB
index-4.html 13KB
RebuildDataBaseBusinessTest.html 13KB
EncodingFilter.html 13KB
Logging.html 13KB
IAPIService.html 13KB
CrawHaodfBusinessTest.html 13KB
DrmedServiceImplTest.html 13KB
Test.html 13KB
DrmedDaoTest.html 12KB
ChineseToEnglish.html 12KB
ICrawlDataBusiness.html 12KB
HaodfDaoTest.html 12KB
IBaseDao.html 12KB
IDrmedService.html 12KB
IDrmedDao.html 12KB
IQueryMatchService.html 12KB
hands-adult.html 12KB
IQueryDiseaseDataBusiness.html 12KB
BaseTest.html 12KB
headaches-adult-A4-H11.html 11KB
drmed症状主页Response.html 11KB
index-5.html 11KB
index-11.html 11KB
SQLAdapter.html 11KB
ConstantApi.html 10KB
tension-headache.html 10KB
BaseTest.html 10KB
ICrawlHaodfBusiness.html 10KB
index-15.html 10KB
IAPIDao.html 9KB
index-2.html 9KB
Logging.html 9KB
IQueryDiseaseDataBusiness.html 9KB
package-use.html 9KB
index-8.html 9KB
IHaodfDao.html 9KB
IDataWriteBusiness.html 9KB
ICrawlDataBusiness.html 9KB
IHaodfService.html 9KB
IDataWriteBusiness.html 9KB
ICrawlHaodfBusiness.html 9KB
IQueryMatchService.html 9KB
IRebuildDataBaseBusiness.html 9KB
package-use.html 9KB
package-use.html 9KB
help-doc.html 8KB
IAPIDao.html 8KB
index-19.html 8KB
package-use.html 8KB
EnumdescField.html 8KB
index-13.html 8KB
allclasses-frame.html 7KB
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