大连网站建设主页,建设彩票网站需要多少投资,微信网站建设计入什么科目,企业推广网java使用Calendar类获得指定日期 关于指定日期的获取#xff0c;是根据指定日期和当前日期相差的天数#xff0c;然后使用set方法设置Calendar.DAY_OF_MONTH的值。Calendar cal Calendar.getInstance();cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH) - da… java使用Calendar类获得指定日期 关于指定日期的获取是根据指定日期和当前日期相差的天数然后使用set方法设置Calendar.DAY_OF_MONTH的值。 Calendar cal Calendar.getInstance(); cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH) - dayPlus); (dayPlus表示指定日期和当前日期相差的天数) 不进行set默认是获取系统时间初步测试没有问题可正确获得指定日期。 ************************************************************************************************* 代码 // 获得当前日期 public static String getDate() { Calendar cal Calendar.getInstance(); return getDate(cal); } // 获得日期 private static String getDate(Calendar cal) { String v_strDate ; int v_intYear cal.get(Calendar.YEAR); int v_intMonth cal.get(Calendar.MONTH) 1; int v_intDAY cal.get(Calendar.DAY_OF_MONTH); int v_intHOUR cal.get(Calendar.HOUR_OF_DAY); int v_intMINUTE cal.get(Calendar.MINUTE); int v_intSECOND cal.get(Calendar.SECOND); if (v_intDAY 10) { v_strDate v_strDate 0 v_intDAY -; }else { v_strDate v_strDate v_intDAY -; } if (v_intMonth 10) { v_strDate v_strDate 0 v_intMonth -; }else { v_strDate v_strDate v_intMonth -; } v_strDate v_strDate v_intYear ; if (v_intHOUR 10) { v_strDate v_strDate 0 v_intHOUR :; }else { v_strDate v_strDate v_intHOUR :; } if (v_intMINUTE 10) { v_strDate v_strDate 0 v_intMINUTE :; } else { v_strDate v_strDate v_intMINUTE :; } if (v_intSECOND 10) { v_strDate v_strDate 0 v_intSECOND; } else { v_strDate v_strDate v_intSECOND; } cal null; return v_strDate; } //获得当前日期与本周日相差的天数 private static int getMondayPlus() { Calendar cd Calendar.getInstance(); // 获得今天是一周的第几天星期日是第一天星期二是第二天...... int dayOfWeek cd.get(Calendar.DAY_OF_WEEK) - 1; // 因为按中国礼拜一作为第一天所以这里减1 if (dayOfWeek 1) { return 0; } else { return dayOfWeek - 1; } } //获得本周一的日期 public static String getThisMondayDate() { Calendar cal Calendar.getInstance(); int mondayPlus getMondayPlus(); cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH)-mondayPlus); cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); return getDate(cal); } //获得本月1号的日期 public static String getCurrentMonthBeginDate(){ Calendar cal Calendar.getInstance(); cal.set(Calendar.DAY_OF_MONTH, 1); cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); return getDate(cal); } //获得上周一的日期 public static String getLastMondayDate(){ Calendar cal Calendar.getInstance(); int dayPlus getMondayPlus()7; cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH)-dayPlus); cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); return getDate(cal); } //获得上周日的日期 public static String getLastSundayDate(){ Calendar cal Calendar.getInstance(); int dayPlus getMondayPlus()1; cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH)-dayPlus); cal.set(Calendar.HOUR_OF_DAY, 23); cal.set(Calendar.MINUTE, 59); cal.set(Calendar.SECOND, 59); return getDate(cal); } //获得上月1号的日期 public static String getLastMonthBeginDate(){ Calendar cal Calendar.getInstance(); cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)-1); cal.set(Calendar.DAY_OF_MONTH,1); cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); return getDate(cal); } //获得上个月最后一天的日期 public static String getLastMonthEndDate(){ Calendar cal Calendar.getInstance(); cal.set(Calendar.DAY_OF_MONTH, 0); cal.set(Calendar.HOUR_OF_DAY, 23); cal.set(Calendar.MINUTE, 59); cal.set(Calendar.SECOND, 59); return getDate(cal); } public static void main(String[] args) { System.out.println(getDate()); System.out.println(getThisMondayDate()); System.out.println(getCurrentMonthBeginDate()); System.out.println(getLastMondayDate()); System.out.println(getLastSundayDate()); System.out.println(getLastMonthBeginDate()); System.out.println(getLastMonthEndDate()); } 转载于:https://www.cnblogs.com/isoftware/p/3921827.html
