1, scrapy (python crawler) 2, pyspider (python crawler) 3. Crawler4j (java stand-alone crawler) 4. WebMagic (java stand-alone crawler) 5. WebCollecto (java stand-alone crawler) 6, Heritrix (java crawler) )
Category: Web Crawler
Web crawlers (also known as web spiders, web robots, in the FOAF community, and more often web chases) are programs or scripts that automatically crawl information on the World Wide Web in accordance with certain rules. Other less commonly used names are ants, automatic indexing, simulators, or worms.
Simple use of PHPSPIDER acquisition this blog article content
Collection process
Acquire page content according to the link (curl)->Get the content that needs to be collected (can be filtered by regular, xpath, css selector, etc.)
Reptile SCRAPY Component Request Metallization, POST Request, Middleware
Use the post request in the scrapy component to call
def start_requests(self):
Transfer parameters and then return yield scrapy.FormRequest(url=url,formdata=data,callback=self.parse)
Make a
Reptile tips
Crawler Tips First of all, what python crawler modules have you used? I believe most people will reply to requests or scrapy, well I mean most people. But for simple crawlers, let’s habitually use
Domestic garbage integrated processing remote data acquisition PLC program monitoring
Project background
Information technology needs to be used to establish an intelligent monitoring system for domestic waste transportation and processing, to realize remote centralized monito
Reptile – picture lazy loading solution
Dynamic data loading processing
I. Lazy loading of pictures
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import requests
from lxml import etree
if __name__ == “__main__”:
url =
Reptral performance analysis and optimization
We wrote a single-task version of the crawler to crawl the user information of Zhenai.com two days ago. What about its performance?
We can take a look at the network utilization. We can see t
Reptile-REQUESTS usage
Chinese document API: http://requests.kennethreitz.org/zh_CN/latest/
Installation
pip install requests Get webpage
# coding=utf-8
import requests
response = requests.get(‘ht
Understand the principle of reptiles
—Recover content begins—
If we compare the Internet to a big spider web, the data is Stored in the various nodes of the spider web, and the crawler is a small spider,
Crawling its o
Graduate reptile (1)
The objects processed by the crawler are links, titles, paragraphs, and pictures.
baidu
xxxx
xxxx
There are two types of links that must be excluded:
1, internal Jump link
xxxx
2, the link