一、目标

爬取该网站的招聘信息

二、网站分析：

首先用xpath规则匹配页面的元素匹配不到，由此初步得出该页面是动态加载的。然后在页面源码中发现要找的数据在一个js中，故最终得出该页面是动态加载的

三、完整代码：

a51job.py

import json

import scrapy

from LearnScrapy1.items import CompanyItem, JobDescItem


class A51jobSpider(scrapy.Spider):
    name = '51job'
    allowed_domains = ['search.51job.com']
    start_urls = [
        'https://search.51job.com/list/010000,000000,0000,00,9,99,python,2,1.html?lang=c&postchannel=0000&workyear=99&cotype=99&degreefrom=99&jobterm=99&companysize=99&ord_field=0&dibiaoid=0']
    base_urls = 'https://search.51job.com/list/010000,000000,0000,00,9,99,python,2,%d.html?lang=c&postchannel=0000&workyear=99&cotype=99&degreefrom=99&jobterm=99&companysize=99&ord_field=0&dibiaoid=0'

    def parse(self, response):
        # print(response)
        # print(response.text)
        js = response.xpath('//script[contains(@type,"text/javascript") and not(@src)]').extract_first()
        r = js.split("__SEARCH_RESULT__")[1][3:-9]
        d = json.loads(r)
        companies = d.get("engine_search_result")
        for company in companies:
            company_item = CompanyItem()
            company_item["company_name"] = company.get("company_name")
            company_item["job_name"] = company.get("job_name")
            company_item["provide_salary_text"] = company.get("providesalary_text")
            company_item["job_href"] = company.get("job_href")
            company_item["work_area_text"] = company.get("workarea_text")

            yield company_item

            yield scrapy.Request(url=company.get("job_href"), callback=self.parse_job_detail, dont_filter=True)

        current_page = int(d.get('curr_page'))

        if current_page == 1:
            total_page = int(d.get('total_page'))

            for i in range(2, total_page):
                yield scrapy.Request(url=self.base_urls % i, callback=self.parse, dont_filter=True)

    def parse_job_detail(self, response):
        result = response.xpath('//div[contains(@class,"bmsg job_msg inbox")]/p/text()').extract() or response.xpath(
            "//div[contains(@class, 'bmsg job_msg inbox')]/div/span/text()").extract()
        print(result)
        job = JobDescItem()
        job["content"] = ";".join(result)
        yield job

pipelines.py

# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html


# useful for handling different item types with a single interface
import MySQLdb
from itemadapter import ItemAdapter

from LearnScrapy1.items import CompanyItem, JobDescItem


class Learnscrapy1Pipeline:

    def open_spider(self,spider):

        conn = MySQLdb.Connect(host='localhost',user='root',password='6666',port=3306,database='job',charset='utf8')
        self.conn = conn
        self.cursor = conn.cursor()

    def close_spider(self,spider):

        self.conn.close()

    def process_item(self, item, spider):


        if isinstance(item,CompanyItem):
            # print(item.get('company_name'))
            # print(item.get('provide_salary_text'))
            # print(item.get('job_href'))
            # print(item.get('work_area_text'))
            # print(item.get('job_name'))


            self.cursor.execute("insert into company(company_name,job_href,company_addr,salary,job_name) values('%s',"
                                "'%s','%s','%s','%s');" % (item.get("company_name"),item.get("job_href"),item.get("work_area_text"),
                                                           item.get("provide_salary_text"),item.get("job_name")))
            self.conn.commit()

        if isinstance(item,JobDescItem):
            self.cursor.execute("insert into job_desc(content) values('%s');" % item.get("content"))
            self.conn.commit()

        return item

items.py

# Define here the models for your scraped items
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/items.html

import scrapy


class Learnscrapy1Item(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()
    pass


class CompanyItem(scrapy.Item):
    company_name = scrapy.Field()
    provide_salary_text = scrapy.Field()
    job_href = scrapy.Field()
    work_area_text = scrapy.Field()
    job_name = scrapy.Field()

class JobDescItem(scrapy.Item):
    content = scrapy.Field()