由于工作关系，很久没更新博客了，今天就给大家带来一篇Java实现获取指定月份的星期与日期对应关系的文章，好了，不多说，我们直接上代码：
一、日期工具类
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package com.lyz.date;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import com.chwl.medical.utils.common.CollectionUtils;import com.chwl.medical.utils.common.ObjectUtils;/** * 日期工具类，获取指定月份的星期与日期的对应关系 * @author liuyazhuang * */public class DateUtils { public static final String DATE_FORMAT = "yyyy-MM-dd"; public enum Type{ Year, Month, Date } /** * 获取两个时间之间的年份 * @param startDate * @param endDate * @return */ public static int getYears(Date startDate, Date endDate, Type type){ int count = 0; Calendar calBegin = Calendar.getInstance(); //获取日历实例 Calendar calEnd = Calendar.getInstance(); calBegin.setTime(startDate); calEnd.setTime(endDate); if(Type.Year == type){ count = calEnd.get(Calendar.YEAR) - calBegin.get(Calendar.YEAR); }else if(Type.Month == type){ count = calEnd.get(Calendar.MONTH) - calBegin.get(Calendar.MONTH); }else{ count = calEnd.get(Calendar.DATE) - calBegin.get(Calendar.DATE); } return count; } /** * 获取指定月份的所有日期和星期集合 * @param offset:起止月份, 0：当前月, 1:下一个月; 2下下月； 以此类推... -1:上一个月; -2:上上一个月 ; 以此类推.... * @param length:终止月份, 0：当前月, 1:下一个月; 2下下月； 以此类推... -1:上一个月; -2:上上一个月 ; 以此类推.... * @return:日期和星期集合:星期为key 日期为value */ public static Map<String, List<String>> getKeyFromMapByValue(int offset, int length){ return getKeyFromMapByValue(getDateKeyWeekValue(offset, length)); } /** * 将以date为key, week为value的map转化为以week为key, date为value的map * @param dateWeek * @return */ public static Map<String, List<String>> getKeyFromMapByValue(Map<String, String> dateWeek){ Map<String, List<String>> weekDate = new HashMap<String, List<String>>(); if(!CollectionUtils.isEmpty(dateWeek)){ for(Map.Entry<String, String> entry : dateWeek.entrySet()){ //获取日期集合 List<String> list = weekDate.get(entry.getValue()); if(ObjectUtils.isEmpty(list)){ list = new ArrayList<String>(); } list.add(entry.getKey()); weekDate.put(entry.getValue(), list); } } return weekDate; } /** * 获取指定月份的所有日期和星期集合 * @param offset:起止月份, 0：当前月, 1:下一个月; 2下下月； 以此类推... -1:上一个月; -2:上上一个月 ; 以此类推.... * @param length:终止月份, 0：当前月, 1:下一个月; 2下下月； 以此类推... -1:上一个月; -2:上上一个月 ; 以此类推.... * @return:日期和星期集合:日期为key 星期为value */ public static Map<String, String> getDateKeyWeekValue(int offset, int length){ Map<String, String> map = new HashMap<String, String>(); for(int i = offset; i <= length; i++){ List<Date> list = getAllTheDateOftheMonth(new Date(),i); for(Date date: list){ String weekDay = getDateOfWeek(date); map.put(parseDateToString(date, DATE_FORMAT), weekDay); } } return map; } /** * 获取当前日期所在月份的所有日期，指定月份的所有日期 * @param date:当前日期 * @param n:1下一月;2:下下月..以此类推; -1:上月,-2:上上月...以此类推 * @return:返回指定月份的所有日期 */ public static List<Date> getAllTheDateOftheMonth(Date date, int n) { List<Date> list = new ArrayList<Date>(); Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.set(Calendar.DATE, 1); cal.add(Calendar.MONTH, n); int month = cal.get(Calendar.MONTH); while(cal.get(Calendar.MONTH) == month){ list.add(cal.getTime()); cal.add(Calendar.DATE, 1); } return list; } /** * 根据日期获得星期 * @param date * @return */ public static String getDateOfWeek(Date date) { //String[] weekDaysName = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" }; String[] weekDaysCode = { "0", "1", "2", "3", "4", "5", "6" }; Calendar calendar = Calendar.getInstance(); calendar.setTime(date); int intWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1; if(intWeek < 0) intWeek = 0; return weekDaysCode[intWeek]; } public static String parseDateToString(Date date, String formatString) { return getSimpleDateFormat(formatString).format(date); } public static SimpleDateFormat getSimpleDateFormat(String formatString) { return new SimpleDateFormat(formatString); }} |
二、测试类
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package com.lyz.date; import net.sf.json.JSONObject; /** * 测试工具类 * @author liuyazhuang * */public class TestDate { public static void main(String[] args) { System.out.println(JSONObject.fromObject(DateUtils.getDateKeyWeekValue(-1, 1))); System.out.println(JSONObject.fromObject(DateUtils.getKeyFromMapByValue(-1,1))); } } |
三、测试结果
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{ "2017-02-28": "2", "2017-04-19": "3", "2017-04-17": "1", "2017-02-25": "6", "2017-04-18": "2", "2017-02-24": "5", "2017-04-15": "6", "2017-02-27": "1", "2017-04-16": "0", "2017-02-26": "0", "2017-04-13": "4", "2017-02-21": "2", "2017-04-14": "5", "2017-02-20": "1", "2017-04-11": "2", "2017-02-23": "4", "2017-04-12": "3", "2017-02-22": "3", "2017-04-21": "5", "2017-04-20": "4", "2017-04-08": "6", "2017-04-09": "0", "2017-04-04": "2", "2017-04-05": "3", "2017-04-06": "4", "2017-04-07": "5", "2017-04-01": "6", "2017-04-02": "0", "2017-04-03": "1", "2017-04-10": "1", "2017-02-07": "2", "2017-02-06": "1", "2017-02-09": "4", "2017-02-08": "3", "2017-03-29": "3", "2017-03-25": "6", "2017-03-26": "0", "2017-03-27": "1", "2017-02-01": "3", "2017-03-28": "2", "2017-03-21": "2", "2017-02-03": "5", "2017-03-22": "3", "2017-02-02": "4", "2017-03-23": "4", "2017-02-05": "0", "2017-03-24": "5", "2017-02-04": "6", "2017-03-31": "5", "2017-03-30": "4", "2017-04-23": "0", "2017-04-22": "6", "2017-02-19": "0", "2017-04-25": "2", "2017-02-18": "6", "2017-04-24": "1", "2017-02-17": "5", "2017-04-27": "4", "2017-04-26": "3", "2017-04-29": "6", "2017-03-18": "6", "2017-04-28": "5", "2017-03-19": "0", "2017-02-12": "0", "2017-03-16": "4", "2017-02-11": "6", "2017-03-17": "5", "2017-02-10": "5", "2017-03-14": "2", "2017-03-15": "3", "2017-02-16": "4", "2017-03-12": "0", "2017-02-15": "3", "2017-03-13": "1", "2017-02-14": "2", "2017-03-10": "5", "2017-02-13": "1", "2017-03-11": "6", "2017-03-20": "1", "2017-03-09": "4", "2017-03-08": "3", "2017-03-07": "2", "2017-03-06": "1", "2017-03-05": "0", "2017-03-04": "6", "2017-03-03": "5", "2017-03-02": "4", "2017-04-30": "0", "2017-03-01": "3"} |
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{ "3": [ "2017-04-19", "2017-04-12", "2017-02-22", "2017-04-05", "2017-02-08", "2017-03-29", "2017-02-01", "2017-03-22", "2017-04-26", "2017-03-15", "2017-02-15", "2017-03-08", "2017-03-01" ], "2": [ "2017-02-28", "2017-04-18", "2017-02-21", "2017-04-11", "2017-04-04", "2017-02-07", "2017-03-28", "2017-03-21", "2017-04-25", "2017-03-14", "2017-02-14", "2017-03-07" ], "1": [ "2017-04-17", "2017-02-27", "2017-02-20", "2017-04-03", "2017-04-10", "2017-02-06", "2017-03-27", "2017-04-24", "2017-03-13", "2017-02-13", "2017-03-20", "2017-03-06" ], "0": [ "2017-04-16", "2017-02-26", "2017-04-09", "2017-04-02", "2017-03-26", "2017-02-05", "2017-04-23", "2017-02-19", "2017-03-19", "2017-02-12", "2017-03-12", "2017-03-05", "2017-04-30" ], "6": [ "2017-02-25", "2017-04-15", "2017-04-08", "2017-04-01", "2017-03-25", "2017-02-04", "2017-04-22", "2017-02-18", "2017-04-29", "2017-03-18", "2017-02-11", "2017-03-11", "2017-03-04" ], "5": [ "2017-02-24", "2017-04-14", "2017-04-21", "2017-04-07", "2017-02-03", "2017-03-24", "2017-03-31", "2017-02-17", "2017-04-28", "2017-03-17", "2017-02-10", "2017-03-10", "2017-03-03" ], "4": [ "2017-04-13", "2017-02-23", "2017-04-20", "2017-04-06", "2017-02-09", "2017-02-02", "2017-03-23", "2017-03-30", "2017-04-27", "2017-03-16", "2017-02-16", "2017-03-09", "2017-03-02" ]} |
总结
本文通过代码示例向大家展示了日期工具类的几种用法，希望对大家学习Java有所帮助。如有不足之处，欢迎留言指出，小编会及时回复大家并更正。感谢朋友们对服务器之家网站的支持！
原文链接：http://blog.csdn.net/l1028386804/article/details/64926588
