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- /**
- * 重庆材料信息价爬虫
- * 由于headless chrome “puppeteer”占用资源比较大,且材料信息价的网站渲染的是静态内容,因此不需要使用puppeteer。
- * 数据获取使用cheerio(解析html,可用类jquery语法操作生成的数据)
- */
- module.exports = {
- crawlData,
- };
- const cheerio = require('cheerio');
- const axios = require('axios');
- const querystring = require('querystring');
- // 页面类型
- const PageType = {
- GENERAL: '/Index.aspx',
- AREA: '/AreaIndex.aspx',
- MIXED: '/ReadyMixedIndex.aspx',
- };
- /**
- * 获取主要材料信息价格页面表单数据
- * @param {Object} $ - 页面内容
- * @param {Object} props - 提交属性
- */
- function getGeneralDataBody($, props) {
- const body = {
- __EVENTTARGET: props.eventTarget || '',
- __EVENTARGUMENT: '',
- __VIEWSTATE: $('#__VIEWSTATE').val(),
- __VIEWSTATEGENERATOR: $('#__VIEWSTATEGENERATOR').val(),
- ID_ucPrice$linkvv: props.period,
- ID_ucPrice$linkcategory: props.materialClass || '',
- ID_ucPrice$LinkValue: `${props.classID},${props.period},${props.materialClass || ''}`,
- ID_ucPrice$txtsonclass: `sonclass${props.classID}`,
- ID_ucPrice$txtfatherclass: $('#ID_ucPrice_txtfatherclass').val(),
- ID_ucPrice$txtClassId: props.classID || '',
- ID_ucPrice$ddlSearchYear: '请选择',
- ID_ucPrice$ddlSearchMonth: '请选择',
- ID_ucPrice$txtSearchCailiao: '',
- ID_ucPrice$UcPager1$listPage: props.page && String(props.page) || '1',
- };
- if (!props.eventTarget) {
- body.ID_ucPrice$btnLink = $('#ID_ucPrice_btnLink').val();
- }
- return body;
- }
- /**
- * 获取各区县地方材料工地价格页面表单数据
- * @param {Object} $ - 页面内容
- * @param {Object} props - 提交属性
- */
- function getAreaDataBody($, props) {
- if (!props || !Object.keys(props).length) {
- return {};
- }
- const body = {
- __EVENTTARGET: props.eventTarget || '',
- __EVENTARGUMENT: '',
- __VIEWSTATE: $('#__VIEWSTATE').val(),
- __VIEWSTATEGENERATOR: $('#__VIEWSTATEGENERATOR').val(),
- ID_ucAreaPrice$linkvv: props.period,
- ID_ucAreaPrice$LinkValue: '',
- ID_ucAreaPrice$dropArea: 'code',
- ID_ucAreaPrice$txtSearchCailiao: '',
- ID_ucAreaPrice$UcPager1$listPage: props.page && String(props.page) || '1',
- };
- if (!props.eventTarget) {
- body.ID_ucAreaPrice$btnAreaMaster = 'Button';
- }
- return body;
- }
- /**
- * 获取预拌砂浆信息价格页面表单数据
- * @param {Object} $ - 页面内容
- * @param {Object} props - 提交属性
- */
- function getMixedDataBody($, props) {
- if (!props || !Object.keys(props).length) {
- return {};
- }
- const body = {
- __EVENTTARGET: props.eventTarget || '',
- __EVENTARGUMENT: '',
- __VIEWSTATE: $('#__VIEWSTATE').val(),
- __VIEWSTATEGENERATOR: $('#__VIEWSTATEGENERATOR').val(),
- ID_ucReadyMixedPrice$linkvv: props.period,
- ID_ucReadyMixedPrice$LinkValue: '',
- ID_ucReadyMixedPrice$dropArea: 'code',
- ID_ucReadyMixedPrice$txtSearchCailiao: '',
- ID_ucReadyMixedPrice$UcPager1$listPage: props.page && String(props.page) || '1',
- };
- if (!props.eventTarget) {
- body.ID_ucReadyMixedPrice$btnAreaMaster = 'Button';
- }
- return body;
- }
- // 获取提交
- const TIME_OUT = 10000;
- // 创建axios实例
- const axiosInstance = axios.create({
- baseURL: 'http://www.cqsgczjxx.org/Jgxx/',
- timeout: TIME_OUT,
- proxy: {
- host: "127.0.0.1", port: "8888" // fiddler抓包
- },
- headers: {
- 'Cache-Control': 'max-age=0',
- 'Content-Type': 'application/x-www-form-urlencoded',
- 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36',
- 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
- 'Accept-Encoding': 'gzip, deflate',
- 'Accept-Language': 'zh-TW,zh;q=0.9,en-US;q=0.8,en;q=0.7,zh-CN;q=0.6',
- },
- responseType: 'document'
- });
- // 响应拦截器
- axiosInstance.interceptors.response.use(function (response) {
- return response;
- }, function (error) {
- // 对响应错误做点什么
- if (error.message.includes('timeout')) {
- return Promise.reject(`目标网络超时,请稍后再试。(${TIME_OUT}ms)`);
- } else {
- return Promise.reject(error);
- }
- });
- // 发起请求需要携带Cookie,否则一些请求会返回500错误(应该是网站的反爬措施)
- let curCookie = '';
- /**
- * 加载页面,获取可用类jquery操作的数据
- * @param {String} url - 拼接的url
- * @param {Object} body - 表单数据
- * @return {DOM-LIKE} - cheerio解析html得到的类dom数据
- */
- async function loadPage(url, body) {
- const config = {};
- if (curCookie) {
- config.headers = { Cookie: curCookie };
- }
- const rst = body ?
- await axiosInstance.post(url, querystring.stringify(body), config) :
- await axiosInstance.post(url, null, config);
- // 更新cookie
- const cookies = rst.headers['set-cookie'];
- if (Object.prototype.toString.call(cookies) === '[object Array]') {
- curCookie = cookies[0].split(';')[0];
- }
- return cheerio.load(rst.data);
- }
- const monthMap = {
- '1': '01',
- '2': '02',
- '3': '03',
- '4': '04',
- '5': '05',
- '6': '06',
- '7': '07',
- '8': '08',
- '9': '09',
- '10': '10',
- '11': '11',
- '12': '12',
- };
- /**
- * 获取期数数据
- * @param {String} from - 从哪一期开始 eg: 2020-01
- * @param {String} to - 从哪一期结束 eg: 2020-05
- * @param {Object} $index - cheerio加载的初始页面内容
- * @return {Array[object] || Null} eg: {period: '2020-05', uid: 'XCCXXXXX-XX'}
- */
- function getPeriodData(from, to, $index) {
- if (from > to) {
- return null;
- }
- const $period = $index('#PriceLMenu')
- // 根据区间获取期数列表
- const reg = /(\d+)-(\d+)/;
- const fromMatch = from.match(reg);
- const fromYear = +fromMatch[1];
- const fromMonth = +fromMatch[2];
- const toMatch = to.match(reg);
- const toYear = +toMatch[1];
- const toMonth = +toMatch[2];
- let curYear = fromYear;
- let curMonth = fromMonth;
- const list = [];
- while (curYear <= toYear && curMonth <= toMonth) {
- const uid = getPeriodUID(curYear, curMonth, $period);
- // 存在无效期数,直接返回空
- if (!uid) {
- return null;
- }
- list.push({
- period: `${curYear}-${monthMap[curMonth]}`,
- uid
- });
- if (curMonth === 12) {
- curYear++;
- curMonth = 1;
- } else {
- curMonth++;
- }
- }
- return list;
- function getPeriodUID(year, month, $period) {
- const $year = $period.find('.MenuOneTitle').filter(function () {
- return $index(this).text() === `${year}年`;
- });
- if (!$year.length) {
- return null;
- }
- const $month = $year.parent().next().find('a').filter(function () {
- return $index(this).text() === `${month}月`;
- });
- if (!$month.length) {
- return null;
- }
- // 期数uid在onclick中,需要提取出来
- const onclickText = $month.attr('onclick').toString();
- const reg = /Onlink\('([^']+)'/;
- const matched = onclickText.match(reg);
- if (!matched || !matched[1]) {
- return null;
- }
- return matched[1];
- }
- }
- // 表格类型
- const TableType = {
- BUILDING: 1, // 主要材料中的建安工程材料和绿色
- GARDEN: 2, // 主要材料中的园林绿化
- ENERGY: 3, // 主要材料中的节能建筑工程材料
- AREA: 4, // 地区相关(各区县材料)
- MIXED: 5, // 地区相关(预拌砂浆)
- };
- /**
- * 爬取表格数据
- * @param {Object} $page - 页面内容
- * @param {Number} type - 表格类型
- * @return {Array[object]}
- */
- function crawlTableData($page, type) {
- switch (type) {
- case TableType.BUILDING:
- case TableType.ENERGY:
- return crawlNormalTable($page);
- case TableType.GARDEN:
- return crawlGardenTable($page);
- case TableType.AREA:
- return crawlAreaTable($page, '#ID_ucAreaPrice_gridView');
- case TableType.MIXED:
- return crawlAreaTable($page, '#ID_ucReadyMixedPrice_gridView');
- }
- return [];
- }
- /**
- * 爬取表格数据,表格列为:
- * 序号 | 材料名称 | 规格型号 | 单位 | 含税价(元) | 不含税价(元) | 备注
- * @param {Object} $page - 页面内容
- * @return {Array[object]}
- */
- function crawlNormalTable($page) {
- const colMap = {
- 0: 'name',
- 1: 'specs',
- 2: 'unit',
- 3: 'taxPrice',
- 4: 'noTaxPrice',
- 5: 'remark'
- };
- const data = [];
- let cur;
- const $tdList = $page('#ID_ucPrice_gridView').find('tr td span').filter(index => index % 7 !== 0); // 排除表头和序号列
- $tdList.each(function (index) {
- const col = index % 6;
- if (col === 0) {
- cur = {}
- }
- cur[colMap[col]] = $page(this).text();
- if (col === 5) {
- data.push(cur);
- }
- });
- console.log(data);
- return data;
- }
- /**
- * 爬取表格数据,表格列为:
- * 序号 | 科属 | 品名 | 高度(CM) | 干径(CM) | 冠径(CM) | 分枝高(CM) | 单位 | 含税价(元) | 不含税价(元) | 备注
- * @param {Object} $page - 页面内容
- * @return {Array[object]}
- */
- function crawlGardenTable($page) {
- const colMap = {
- 0: 'genera',
- 1: 'name',
- 2: 'height',
- 3: 'branchDiameter',
- 4: 'crownDiameter',
- 5: 'branchHeight',
- 6: 'unit',
- 7: 'taxPrice',
- 8: 'noTaxPrice',
- 9: 'remark',
- };
- const data = [];
- let cur;
- const $tdList = $page('#ID_ucPrice_gridView').find('tr td span').filter(index => index % 11 !== 0); // 排除表头和序号列
- $tdList.each(function (index) {
- const col = index % 10;
- if (col === 0) {
- cur = {}
- }
- cur[colMap[col]] = $page(this).text();
- if (col === 9) {
- data.push(cur);
- }
- });
- console.log(data);
- return data;
- }
- /**
- * 爬取表格数据,表格列为:
- * 序号 | 所属区县 | 材料名称 | 规格及型号 | 计量单位 | 含税价(元) | 不含税价(元)
- * @param {Object} $page - 页面内容
- * @param {String} viewSelector - 表格选择器(ID)
- * @return {Array[object]}
- */
- function crawlAreaTable($page, viewSelector) {
- const colMap = {
- 0: 'area',
- 1: 'name',
- 2: 'specs',
- 3: 'unit',
- 4: 'taxPrice',
- 5: 'noTaxPrice',
- };
- const data = [];
- let cur;
- const $tdList = $page(viewSelector).find('tr td span').filter(index => index % 7 !== 0); // 排除表头和序号列
- $tdList.each(function (index) {
- const col = index % 6;
- if (col === 0) {
- cur = {}
- }
- cur[colMap[col]] = $page(this).text();
- if (col === 5) {
- data.push(cur);
- }
- });
- console.log(data);
- return data;
- }
- // 事件触发类型
- const EventTarget = {
- GENERAL_NEXT: 'ID_ucPrice$UcPager1$btnNext',
- AREA_NEXT: 'ID_ucAreaPrice$UcPager1$btnNext',
- MIXED_NEXT: 'ID_ucReadyMixedPrice_UcPager1_btnNext',
- };
- /**
- * 爬取一页一页的表格数据
- * @param {Object} $index - 索引页面内容
- * @param {Object} props - 提交的表单内容
- * @param {String} pageType - 页面类型
- * @param {Number} tableType - 表格类型
- */
- async function crawlPagesData($index, props, pageType, tableType) {
- let body;
- let pageStateSelector;
- if (pageType === PageType.GENERAL) {
- body = getGeneralDataBody($index, props);
- pageStateSelector = '#ID_ucPrice_UcPager1_lbPage';
- } else if (pageType === PageType.AREA) {
- body = getAreaDataBody($index, props);
- pageStateSelector = '#ID_ucAreaPrice_UcPager1_lbPage';
- } else {
- body = getMixedDataBody($index, props);
- pageStateSelector = '#ID_ucReadyMixedPrice_UcPager1_lbPage';
- }
- const $firstPage = await loadPage(pageType, body);
- const rst = [];
- // 获取第一页数据
- rst.push(...crawlTableData($firstPage, tableType));
- // 获取除第一页的数据
- // 获取页码
- const pageState = $firstPage(pageStateSelector).text(); // eg: 1/10
- const totalPage = +pageState.split('/')[1];
- const asyncCount = 6; // 最高批量次数
- let curCount = 0;
- let task = [];
- for (let page = 1; page < totalPage; page++) {
- task.push(crawlPageData(page));
- curCount++;
- if (curCount === asyncCount) {
- const allData = await Promise.all(task);
- allData.forEach(data => rst.push(...data));
- curCount = 0;
- task = [];
- }
- }
- if (task.length) {
- const allData = await Promise.all(task);
- allData.forEach(data => rst.push(...data));
- }
- return rst;
- // 爬取页码数据
- async function crawlPageData(page) {
- const pageProps = { ...props, page };
- let body;
- if (pageType === PageType.GENERAL) {
- pageProps.eventTarget = EventTarget.GENERAL_NEXT;
- body = getGeneralDataBody($firstPage, pageProps);
- } else if (pageType === PageType.AREA) {
- pageProps.eventTarget = EventTarget.AREA_NEXT;
- body = getAreaDataBody($firstPage, pageProps);
- } else {
- pageProps.eventTarget = EventTarget.MIXED_NEXT;
- body = getMixedDataBody($firstPage, pageProps);
- }
- const $page = await loadPage(pageType, body);
- return crawlTableData($page, tableType);
- }
- }
- /**
- * 爬取建安工程材料和绿色、园林绿化工程材料、节能建筑工程材料
- * @param {String} period - 期数uid
- * @param {String} classID - 工程分类id
- * @param {Object} $index - 初始页面内容
- * @param {Number} type - 表格类型
- * @return {Array[object]} eg: [{ materialClass: '一、黑色及有色金属', items: [...] }]
- */
- async function crawlGeneralSubData(period, classID, $index, type) {
- const body = getGeneralDataBody($index, { period, classID });
- console.time('crawlGeneralSubData');
- const $engineeringClassPage = await loadPage(PageType.GENERAL, body);
- const rst = [];
- if (type === TableType.BUILDING) {
- const classList = crawlMaterialClassList($index('#ID_ucPrice_CategoryLabel'));
- if (!classList.length) {
- throw '无法爬取到材料分类。';
- }
- console.log(classList);
- for (const materialClass of classList) {
- const obj = { materialClass, items: [] };
- obj.items = await crawlPagesData($engineeringClassPage, { period, classID, materialClass }, PageType.GENERAL, type);
- rst.push(obj);
- }
- } else {
- const items = await crawlPagesData($engineeringClassPage, { period, classID, materialClass: '' }, PageType.GENERAL, type);
- rst.push(...items);
- }
- console.timeEnd('crawlGeneralSubData');
- // 爬取材料分类表
- function crawlMaterialClassList($class) {
- const list = [];
- $class.find('a').each(function () {
- const text = $engineeringClassPage(this).text();
- list.push(text);
- });
- return list;
- }
- }
- /**
- * 爬取主要材料信息价格(这部分作为通用库)
- * @param {String} period - 期数uid
- * @param {Object} $index - 初始页面内容
- * @return {Object}
- */
- async function crawlGeneralData(period, $index) {
- const { building, garden, energy } = crawlClass($index('#ID_ucPrice_tabNewBar'));
- const rst = {};
- if (building) {
- rst.building = await crawlGeneralSubData(period, building, $index, TableType.BUILDING);
- }
- if (garden) {
- // 园林绿化工程材料下的数据所属分类为数据的"科属"列
- rst.garden = await crawlGeneralSubData(period, garden, $index, TableType.GARDEN);
- }
- if (energy) {
- // 绿色、节能建筑工程材料下的所有数据,所属分类均为“绿色、节能建筑工程材料”。
- rst.energy = await crawlGeneralSubData(period, energy, $index, TableType.ENERGY);
- }
- return rst;
- // 爬取工程分类
- function crawlClass($class) {
- // 工程分类
- let building; // 建安工程材料
- let garden; // 园林绿化工程材料
- let energy; // 绿色、节能建筑工程材料
- const reg = /OnClassson\('([^']+)'/;
- $class.find('a').each(function () {
- const text = $index(this).text();
- const onclickText = $index(this).attr('onclick').toString();
- const matched = onclickText.match(reg);
- if (!matched || !matched[1]) {
- throw '无法爬取到工程分类。';
- }
- if (text === '建安工程材料') {
- building = matched[1];
- } else if (text === '园林绿化工程材料') {
- garden = matched[1];
- } else if (text === '绿色、节能建筑工程材料') {
- energy = matched[1];
- }
- });
- return { building, garden, energy };
- }
- }
- /**
- * 爬取各区县地方材料工地价格
- * @param {String} period - 期数uid
- * @return {Array[objecy]
- */
- async function crawlAreaData(period) {
- // 获取各区材料初始页
- const $index = await loadPage(PageType.AREA);
- // 获取地区材料
- return await crawlPagesData($index, { period }, PageType.AREA, TableType.AREA);
- }
- /**
- * 爬取预拌砂浆信息价格
- * @param {String} period - 期数uid
- * @return {Array[objecy]
- */
- async function crawlMixedData(period) {
- // 获取各区材料初始页
- const $index = await loadPage(PageType.MIXED);
- // 获取地区材料
- return await crawlPagesData($index, { period }, PageType.MIXED, TableType.MIXED);
- }
- /**
- *
- * @param {String} period 期数 eg: '2020-05'
- * @param {Object} generalData - 主要材料{ building, garden, energy }
- * @param {Array[object]} areaData - 各地区材料
- * @param {Array[object]} mixedData - 各地区预拌砂浆
- */
- function transfromAndSave(period, generalData, areaData, mixedData) {
- }
- /**
- * 爬取数据
- * @param {String} from - 从哪一期开始 eg: 2020-01
- * @param {String} to - 从哪一期结束 eg: 2020-05
- * @return {Object}
- */
- async function crawlData(from, to) {
- let curPeriod;
- try {
- const $index = await loadPage(PageType.GENERAL);
- const periodData = getPeriodData(from, to, $index);
- if (!periodData) {
- throw '无效的期数区间。';
- }
- console.log(periodData);
- // 一期一期爬取数据
- for (const periodItem of periodData) {
- // 爬取主要材料信息价格
- const generalData = await crawlGeneralData(periodItem.uid, $index); // 初始页面就是主要材料信息价的页面
- // 爬取各区县地方材料工地价格
- const areaData = await crawlAreaData(periodItem.uid);
- // 爬取预拌砂浆信息价格
- const mixedData = await crawlMixedData(periodItem.uid);
-
- curPeriod = periodItem.period;
- }
- } catch (err) {
- // 错误时提示已经成功爬取的期数
- let errTip = '';
- if (curPeriod) {
- errTip += `\n成功爬取期数为:${from}到${curPeriod}`;
- }
- const errStr = String(err) + errTip;
- console.log(`err`);
- console.log(errStr);
- }
- }
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