基于Java代码实现判断春节、端午节、中秋节等法定节假日的方法

一、前言

最近工作上遇到一个问题，后端有一个定时任务，需要用JAVA每天判断法定节假日、周末放假，上班等情况，其实想单独通过逻辑什么的去判断中国法定节假日的放假情况，基本不可能，因为国家每一年的假期可能不一样，是人为设定的；

所以只能依靠其它手段，能想到的比较靠谱的如下：

1.网络接口：有些数据服务商会提供，要么是收钱的，要么是次数限制，等等各种问题，效果不理想，可控性差，我也没试过，如：

https://www.juhe.cn/docs/api/id/177/aid/601

或者

http://apistore.baidu.com/apiworks/servicedetail/1116.html

2.在线解析网页信息，获取节假日情况：严重依赖被解析的网站网页，所以在选取网站的时候，要找稍微靠谱点的；

3.根据国家规定的法定节假日放假情况，每年录入系统，这种如果客户不怕麻烦的话。还是比较靠谱的；

本Demo将选择第二种来实现；

二、使用htmlunit在线解析网页信息，获取节假日情况

一开始是使用jsoup去解析网页的，效果不理想，如果网页是动态生成的时候，用jsoup遇到了各种问题，所以改成了htmlunit，总得来说htmlunit还是很强大的，能够模拟浏览器运行，被誉为java浏览器的开源实现；

首先去官网下载相关jar包，以及阅读相关文档：

http://htmlunit.sourceforge.net/

我这里解析的网页是360的万年历：

http://hao.360.cn/rili/

日历界面如下：

被解析的 HTML格式如下：

实现步骤：

1、加载页面；

2、循环等待页面加载完成（可能会有一些动态页面，是用javascript生成）；

3、根据网页格式解析html内容，并提取关键信息存入封装好的对象；

注意点：

1、难点在于判断是否休假及假期类型，由于原页面并没有标明每一天的假期类型，所以这里的逻辑要自己去实现，详情参考代码；

2、之所以有个静态latestVocationName变量，是防止出现以下情况（出现该情况的概率极低；PS:方法要每天调用一次，该变量才生效）：

代码实现：

定义一个中国日期类：

package com.pichen.tools.getDate;import java.util.Date;public class ChinaDate {/*** 公历时间*/private Date solarDate;/*** 农历日*/private String lunar;/*** 公历日*/private String solar;/*** 是否是 休*/private boolean isVacation = false;/*** 如果是 休情况下的假期名字*/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;}}

解析网页，并调用demo，打印本月详情，和当天详情：

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("春节")){voationName = "春节";}else if(lanarText.equals("清明")){voationName = "清明";}else if(lanarText.equals("国际劳动节")){voationName = "国际劳动节";}else if(lanarText.equals("端午节")){voationName = "端午节";}else if(lanarText.equals("中秋节")){voationName = "中秋节";}else if(lanarText.equals("国庆节")){voationName = "国庆节";}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《当前时间，且最近一次的可见的假期名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，等待页面加载完成...，有时候，页面可能获取不到，不稳定（）//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("本月详情：");for(ChinaDate date: dateList){System.out.println(dateFormat.format(date.getSolarDate()) + " " + date.getVacationName());}System.out.println("------------------------------------------------------------------------");System.out.println("今日详情：");System.out.println("日期：" + today.getSolarDate());System.out.println("农历："+today.getLunar());System.out.println("公历："+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("已发生的最近一次假期:" + Main.latestVocationName);}}

运行程序，结果正确：