import scrapy

class JianliItem(scrapy.Item):

    name = scrapy.Field()

    url = scrapy.Field()

import pymysql                            #导入数据库的类

class JianliPipeline(object):

    conn = None

    cursor = None

    def open_spider(self,spider):

        print('开始爬虫')

        self.conn = pymysql.Connect(host='127.0.0.1',port=3306,user='root',password='',db='jianli')     #链接数据库

    def process_item(self, item, spider):                #编写向数据库中存储数据的相关代码

        self.cursor = self.conn.cursor()                                        #1.链接数据库

        sql = 'insert into jl values("%s","%s")'%(item['name'],item['url'])            #2.执行sql语句

        try:                                                    #执行事务

            self.cursor.execute(sql)

            self.conn.commit()

        except Exception as e:

            print(e)

            self.conn.rollback()

        return item

    def close_spider(self,spider):

        print('爬虫结束')

        self.cursor.close()

        self.conn.close()

# -*- coding: utf-8 -*-

import scrapy

import re

from lxml import etree

from jianli.items import JianliItem

class FxhSpider(scrapy.Spider):

    name = 'jl'

    # allowed_domains = ['feixiaohao.com']

    start_urls = ['http://sc.chinaz.com/jianli/free_{}.html'.format(i) for i in range(3)]

    def parse(self,response):

        tree = etree.HTML(response.text)

        a_list = tree.xpath('//div[@id="container"]/div/a')

        for a in a_list:

            item = JianliItem (

                name=a.xpath("./img/@alt")[0],

                url=a.xpath("./@href")[0]

            )

            yield item

#USER_AGENT

headers = {

    "user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36"

}

# Obey robots.txt rules

ROBOTSTXT_OBEY = False

# Configure item pipelines

# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html

ITEM_PIPELINES = {

   'jianli.pipelines.JianliPipeline': 300,

}