数据采集第五次作业

第五次作业

一、作业内容

作业一:

要求：

熟练掌握 Selenium 查找HTML元素、爬取Ajax网页数据、等待HTML元素等内容。使用Selenium框架爬取京东商城某类商品信息及图片。

候选网站：http://www.jd.com/

关键词：学生自由选择

输出信息：MYSQL的输出信息如下

步骤如下：

　　①建表与输入查询

    def startUp(self, url, key):
        # # Initializing Chrome browser
        chrome_options = Options()
        chrome_options.add_argument('--headless')
        chrome_options.add_argument('--disable-gpu')
        self.driver = webdriver.Chrome(chrome_options=chrome_options)

        # Initializing variables
        self.threads = []
        self.No = 0
        self.imgNo = 0
        # Initializing database
        try:
            self.conn = pymysql.connect(host='localhost', port=3306, user='root', password='cyz2952178079', db='phones',
                                   charset='utf8')
            self.cursor = self.conn.cursor()
            try:
                # 如果有表就删除
                self.cursor.execute("drop table phones")
            except:
                pass
            try:
                #  建立新的表
                sql = "create  table  phones  (mNo  varchar(32) primary key, mMark varchar(256),mPrice varchar(32),mNote varchar(1024),mFile varchar(256))"
                self.cursor.execute(sql)
            except:
                pass

        except Exception as err:
            print(err)
            # Initializing images folder
            try:
                if not os.path.exists(MySpider.imagePath):
                    os.mkdir(MySpider.imagePath)
                images = os.listdir(MySpider.imagePath)
                for img in images:
                    s = os.path.join(MySpider.imagePath, img)
                    os.remove(s)
            except Exception as err:
                print(err)
        self.driver.get(url)
        keyInput = self.driver.find_element_by_id("key")
        keyInput.send_keys(key)
        keyInput.send_keys(Keys.ENTER)

　　②根据网页标签寻找对应的xpath，插入数据库

    def processSpider(self):
        try:
            time.sleep(1)
            print(self.driver.current_url)
            lis =self.driver.find_elements_by_xpath("//div[@id='J_goodsList']//li[@class='gl-item']")
            for li in lis:
            # We find that the image is either in src or in data-lazy-img attribute
                try:
                    src1 = li.find_element_by_xpath(".//div[@class='p-img']//a//img").get_attribute("src")
                except:
                    src1 = ""

                try:
                    src2 = li.find_element_by_xpath(".//div[@class='p-img']//a//img").get_attribute("data-lazy-img")
                except:
                    src2 = ""
                try:
                    price = li.find_element_by_xpath(".//div[@class='p-price']//i").text
                except:
                    price = "0"

                try:
                    note = li.find_element_by_xpath(".//div[@class='p-name p-name-type-2']//em").text
                    mark = note.split(" ")[0]
                    mark = mark.replace("爱心东东\n", "")
                    mark = mark.replace(",", "")
                    note = note.replace("爱心东东\n", "")
                    note = note.replace(",", "")

                except:
                    note = ""
                    mark = ""
                self.No = self.No + 1
                no = str(self.No)
                while len(no) < 6:
                    no = "0" + no
                print(no, mark, price)
                if src1:
                    src1 = urllib.request.urljoin(self.driver.current_url, src1)
                    p = src1.rfind(".")
                    mFile = no + src1[p:]
                elif src2:
                    src2 = urllib.request.urljoin(self.driver.current_url, src2)
                    p = src2.rfind(".")
                    mFile = no + src2[p:]
                if src1 or src2:
                    T = threading.Thread(target=self.download, args=(src1, src2, mFile))
                    T.setDaemon(False)
                    T.start()
                    self.threads.append(T)
                else:
                    mFile = ""
                self.insertDB(no, mark, price, note, mFile)

　　③实现翻页

　　先查看对应标签，后编写翻页的代码

            try:
                self.driver.find_element_by_xpath("//span[@class='p-num']//a[@class='pn-next disabled']")
            except:
                nextPage = self.driver.find_element_by_xpath("//span[@class='p-num']//a[@class='pn-next']")
                time.sleep(10)
                nextPage.click()
                self.processSpider()

　　④图片下载

    def download(self, src1, src2, mFile):
        data = None
        if src1:
            try:
                req = urllib.request.Request(src1, headers=MySpider.headers)
                resp = urllib.request.urlopen(req, timeout=10)
                data = resp.read()
            except:
                pass
        if not data and src2:
            try:
                req = urllib.request.Request(src2, headers=MySpider.headers)
                resp = urllib.request.urlopen(req, timeout=10)
                data = resp.read()
            except:
                pass
        if data:
            print("download begin", mFile)
            fobj = open(MySpider.imagePath + "\\" + mFile, "wb")
            fobj.write(data)
            fobj.close()
            print("download finish", mFile)

　　⑤查看结果

作业二:

要求：

熟练掌握 Selenium 查找HTML元素、实现用户模拟登录、爬取Ajax网页数据、等待

HTML元素等内容。

使用Selenium框架+MySQL爬取中国mooc网课程资源信息（课程号、课程名称、教学

进度、课程状态，课程图片地址），同时存储图片到本地项目根目录下的imgs文件夹

中，图片的名称用课程名来存储。

候选网站：中国mooc网：https://www.icourse163.org

输出信息：MYSQL数据库存储和输出格式

表头应是英文命名例如：课程号ID，课程名称：cCourse……，由同学们自行定义

设计表头：

步骤如下：

　　①设置驱动

# 使用谷歌驱动器
options = webdriver.ChromeOptions()
# options.add_experimental_option('prefs', {'profile.managed_default_content_settings.images': 2})
browser = webdriver.Chrome(options=options)
url = 'https://www.icourse163.org/'
data_list = []

　　②登录

browser.get(url)
    # 获取登录框
    start = browser.find_element_by_css_selector('a.f-f0.navLoginBtn')
    start.click()
    # 这里留20秒手动扫码登录一下
    time.sleep(20)
    person = browser.find_element_by_xpath(
        '/html/body/div[4]/div[1]/div/div/div/div/div[7]/div[3]/div/div/a/span')
    person.click()
    print("正在进入个人中心")

　　③获取课程信息

print("慕课的课程总数:", len(courses))
    for course in courses:
        try:
            name = course.find_element_by_xpath('./div[1]/a/div[2]/div[1]/div[1]/div/span[2]').text
            school = course.find_element_by_xpath('./div[1]/a/div[2]/div[1]/div[2]/a').text
            schedule = course.find_element_by_xpath('./div[1]/a/div[2]/div[2]/div[1]/div[1]/div[1]/a/span').text
            status = course.find_element_by_xpath('./div[1]/a/div[2]/div[2]/div[2]').text
            imgUrl = course.find_element_by_xpath('./div[1]/a/div[1]//img').get_attribute("src")
            filename = "./images/"+str(name)+".jpg"
            urllib.request.urlretrieve(imgUrl, filename)
            data_list.append([name, school, schedule, status, imgUrl])
        except Exception as err:
            print("error:", err)