一、前言
最近工作上遇到一個問題，后端有一個定時任務，需要用JAVA每天判斷法定節假日、周末放假，上班等情況，其實想單獨通過邏輯什么的去判斷中國法定節假日的放假情況，基本不可能，因為國家每一年的假期可能不一樣，是人為設定的；
所以只能依靠其它手段，能想到的比較靠譜的如下：
1.網絡接口：有些數據服務商會提供，要么是收錢的，要么是次數限制，等等各種問題，效果不理想，可控性差，我也沒試過，如：
https://www.juhe.cn/docs/api/id/177/aid/601
或者
http://apistore.baidu.com/apiworks/servicedetail/1116.html
2.在線解析網頁信息，獲取節假日情況：嚴重依賴被解析的網站網頁，所以在選取網站的時候，要找稍微靠譜點的；
3.根據國家規定的法定節假日放假情況，每年錄入系統，這種如果客戶不怕麻煩的話。還是比較靠譜的；
本Demo將選擇第二種來實現；
二、使用htmlunit在線解析網頁信息，獲取節假日情況
一開始是使用jsoup去解析網頁的，效果不理想，如果網頁是動態生成的時候，用jsoup遇到了各種問題，所以改成了htmlunit，總得來說htmlunit還是很強大的，能夠模擬瀏覽器運行，被譽為java瀏覽器的開源實現；
首先去官網下載相關jar包，以及閱讀相關文檔：
http://htmlunit.sourceforge.net/
我這里解析的網頁是360的萬年歷：
日歷界面如下：
被解析的 HTML格式如下：
實現步驟：
1、加載頁面；
2、循環等待頁面加載完成（可能會有一些動態頁面，是用javascript生成）；
3、根據網頁格式解析html內容，并提取關鍵信息存入封裝好的對象；
注意點：
1、難點在于判斷是否休假及假期類型，由于原頁面并沒有標明每一天的假期類型，所以這里的邏輯要自己去實現，詳情參考代碼；
2、之所以有個靜態latestVocationName變量，是防止出現以下情況（出現該情況的概率極低；PS:方法要每天調用一次，該變量才生效）：
代碼實現：
定義一個中國日期類：
package com.pichen.tools.getDate;import java.util.Date;public class ChinaDate {/*** 公歷時間*/private Date solarDate;/*** 農歷日*/private String lunar;/*** 公歷日*/private String solar;/*** 是否是 休*/private boolean isVacation = false;/*** 如果是 休情況下的假期名字*/private String VacationName = "非假期";/*** 是否是 班*/private boolean isWorkFlag = false;private boolean isSaturday = false;private boolean isSunday = false;/*** @return the solarDate*/public Date getSolarDate() {return solarDate;}/*** @param solarDate the solarDate to set*/public void setSolarDate(Date solarDate) {this.solarDate = solarDate;}/*** @return the lunar*/public String getLunar() {return lunar;}/*** @param lunar the lunar to set*/public void setLunar(String lunar) {this.lunar = lunar;}/*** @return the solar*/public String getSolar() {return solar;}/*** @param solar the solar to set*/public void setSolar(String solar) {this.solar = solar;}/*** @return the isVacation*/public boolean isVacation() {return isVacation;}/*** @param isVacation the isVacation to set*/public void setVacation(boolean isVacation) {this.isVacation = isVacation;}/*** @return the vacationName*/public String getVacationName() {return VacationName;}/*** @param vacationName the vacationName to set*/public void setVacationName(String vacationName) {VacationName = vacationName;}/*** @return the isWorkFlag*/public boolean isWorkFlag() {return isWorkFlag;}/*** @param isWorkFlag the isWorkFlag to set*/public void setWorkFlag(boolean isWorkFlag) {this.isWorkFlag = isWorkFlag;}/*** @return the isSaturday*/public boolean isSaturday() {return isSaturday;}/*** @param isSaturday the isSaturday to set*/public void setSaturday(boolean isSaturday) {this.isSaturday = isSaturday;}/*** @return the isSunday*/public boolean isSunday() {return isSunday;}/*** @param isSunday the isSunday to set*/public void setSunday(boolean isSunday) {this.isSunday = isSunday;}}解析網頁，并調用demo，打印本月詳情，和當天詳情：
package com.pichen.tools.getDate;import java.io.IOException;import java.net.MalformedURLException;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import com.gargoylesoftware.htmlunit.FailingHttpStatusCodeException;import com.gargoylesoftware.htmlunit.WebClient;import com.gargoylesoftware.htmlunit.html.DomNodeList;import com.gargoylesoftware.htmlunit.html.HtmlElement;import com.gargoylesoftware.htmlunit.html.HtmlPage;public class Main {private static String latestVocationName="";public String getVocationName(DomNodeList<HtmlElement> htmlElements, String date) throws ParseException{String rst = "";boolean pastTimeFlag = false;DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");Date paramDate = dateFormat.parse(date);if(new Date().getTime() >= paramDate.getTime()){pastTimeFlag = true;}//first step //jugde if can get vocation name from html pagefor(int i = 0; i < htmlElements.size(); i++){HtmlElement element = htmlElements.get(i);if(element.getAttribute("class").indexOf("vacation")!=-1){boolean hitFlag = false;String voationName = "";for(; i < htmlElements.size(); i++){HtmlElement elementTmp = htmlElements.get(i);String liDate = elementTmp.getAttribute("date");List<HtmlElement> lunar = elementTmp.getElementsByAttribute("span", "class", "lunar");String lanarText = lunar.get(0).asText();if(lanarText.equals("元旦")){voationName = "元旦";}else if(lanarText.equals("除夕")||lanarText.equals("春節")){voationName = "春節";}else if(lanarText.equals("清明")){voationName = "清明";}else if(lanarText.equals("國際勞動節")){voationName = "國際勞動節";}else if(lanarText.equals("端午節")){voationName = "端午節";}else if(lanarText.equals("中秋節")){voationName = "中秋節";}else if(lanarText.equals("國慶節")){voationName = "國慶節";}if(liDate.equals(date)){hitFlag = true;}if(elementTmp.getAttribute("class").indexOf("vacation")==-1){break;}}if(hitFlag == true && !voationName.equals("")){rst = voationName;break;}}else{continue;}}//if first step fail(rarely), get from the latest Vocation nameif(rst.equals("")){System.out.println("warning: fail to get vocation name from html page.");//you can judge by some simple rule //from the latest Vocation namerst = Main.latestVocationName;}else if(pastTimeFlag == true){//更新《當前時間，且最近一次的可見的假期名Main.latestVocationName = rst;}return rst;}public List<ChinaDate> getCurrentDateInfo(){WebClient webClient = null;List<ChinaDate> dateList = null;try{DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");dateList = new ArrayList<ChinaDate>();webClient = new WebClient();HtmlPage page = webClient.getPage("http://hao.360.cn/rili/");//最大等待60秒for(int k = 0; k < 60; k++){if(!page.getElementById("M-dates").asText().equals("")) break;Thread.sleep(1000);}//睡了8秒，等待頁面加載完成...，有時候，頁面可能獲取不到，不穩定（）//Thread.sleep(8000);DomNodeList<HtmlElement> htmlElements = page.getElementById("M-dates").getElementsByTagName("li");//System.out.println(htmlElements.size());for(HtmlElement element : htmlElements){ChinaDate chinaDate = new ChinaDate();List<HtmlElement> lunar = element.getElementsByAttribute("span", "class", "lunar");List<HtmlElement> solar = element.getElementsByAttribute("div", "class", "solar");chinaDate.setLunar(lunar.get(0).asText());chinaDate.setSolar(solar.get(0).asText());chinaDate.setSolarDate(dateFormat.parse(element.getAttribute("date")));if(element.getAttribute("class").indexOf("vacation")!=-1){chinaDate.setVacation(true);chinaDate.setVacationName(this.getVocationName(htmlElements, element.getAttribute("date")));}if(element.getAttribute("class").indexOf("weekend")!=-1 && element.getAttribute("class").indexOf("last")==-1){chinaDate.setSaturday(true);}if(element.getAttribute("class").indexOf("last weekend")!=-1){chinaDate.setSunday(true);}if(element.getAttribute("class").indexOf("work")!=-1){chinaDate.setWorkFlag(true);}else if(chinaDate.isSaturday() == false &&chinaDate.isSunday() == false && chinaDate.isVacation() == false ){chinaDate.setWorkFlag(true);}else{chinaDate.setWorkFlag(false);}dateList.add(chinaDate);}}catch(Exception e){e.printStackTrace();System.out.println("get date from http://hao.360.cn/rili/ error~");}finally{webClient.close();}return dateList;}public ChinaDate getTodayInfo(){List<ChinaDate> dateList = this.getCurrentDateInfo();DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");for(ChinaDate date: dateList){if(dateFormat.format(date.getSolarDate()).equals(dateFormat.format(new Date()))){return date;}}return new ChinaDate();}public static void main(String[] args) throws FailingHttpStatusCodeException, MalformedURLException, IOException, InterruptedException {List<ChinaDate> dateList = new Main().getCurrentDateInfo();ChinaDate today = new Main().getTodayInfo();DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");System.out.println("本月詳情：");for(ChinaDate date: dateList){System.out.println(dateFormat.format(date.getSolarDate()) + " " + date.getVacationName());}System.out.println("------------------------------------------------------------------------");System.out.println("今日詳情：");System.out.println("日期：" + today.getSolarDate());System.out.println("農歷："+today.getLunar());System.out.println("公歷："+today.getSolar());System.out.println("假期名："+today.getVacationName());System.out.println("是否周六："+today.isSaturday());System.out.println("是否周日："+today.isSunday());System.out.println("是否休假："+today.isVacation());System.out.println("是否工作日："+today.isWorkFlag());System.out.println("已發生的最近一次假期:" + Main.latestVocationName);}}運行程序，結果正確：
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