基于python的毕业设计-基于Python网络爬虫的设计与实现毕业论文+源码

ABSTRACT

The main purpose of this project is to design subject-oriented web crawler process, which require to meet different performance and related to the various details of the targeted web crawler and application in detail.

Search engine is a tool to help people retrieve information. However, these general search engines also have some limitations. Users in different fields and backgrounds tend to have different purposes and needs, and the results returned by general search engines contain a large number of web pages that users don't care about. In order to solve this problem, it is of great significance for a flexible crawler.

Web crawler application of intelligent self construction technology, with the different themes of the site, you can automatically analyze the structure of URL, and cancel duplicate part. Web crawler use multi-threading technology, so that the crawler has a more powerful ability to grab. Setting connection and reading time of the network crawler is to avoid unlimited waiting. In order to adapt to the different needs, the web crawler can base on the preset themes to realize to filch the specific topics. What’s more, we should study the principle of the web crawler ,realize the relevant functions of reptiles, save the stolen data to the database after cleaning and in late achieve the visual display.

Keywords：Web crawler,Directional climb,multi-threading,mongodb