[Java]获取自定义格式的时间

import java.io.IOException;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.List;import cn.com.agree.ab.trade.core.Trade;/** * <DL> * <DT><B> 功能说明</B></DT> * 字符串处理工具 * </DL> * * @author * @since 2015-6-3 */public class DateUtil {/** * <b>功能说明</b> 获取自定义格式的时间 * * @param format *格式 *<p> *<b>例如：</b><br> *使用例子说明 String a=NetCheck.getdataString("yyyyMMdd"); *</p> */public static String getdataString(String format) {DateFormat dateFormat = new SimpleDateFormat(format);return dateFormat.format(new Date());}public static String getNextDay(Date date, String format) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.add(Calendar.DAY_OF_MONTH, -7);date = calendar.getTime();DateFormat dateFormat = new SimpleDateFormat(format);return dateFormat.format(date);}public static String getFormatDate(String datestr) throws ParseException {SimpleDateFormat df = new SimpleDateFormat("yyyyMMddhhmmss");Date date = null;date = df.parse(datestr);DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");return dateFormat.format(date);}public static String getNextDay(Date date, String format, int days) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.add(Calendar.DAY_OF_MONTH, days);date = calendar.getTime();DateFormat dateFormat = new SimpleDateFormat(format);return dateFormat.format(date);}public static List<String> getMonthWeekends(Trade trade,int month,int year) throws IOException{List<String> hostDays = new ArrayList<String>();Calendar cal = Calendar.getInstance();cal.set(Calendar.YEAR, year);cal.set(Calendar.MONTH, month-1);cal.set(Calendar.DAY_OF_MONTH, 1);int startIndex = cal.get(Calendar.DAY_OF_WEEK) -1 ; // 0~6 表示 周日 ~ 周六int endIndex = startIndex + getLastDayOfMonth(year, month) – 1;int startday = 1;for (int i = 0; i < 42; i++) {if (i >= startIndex && i <= endIndex) {cal.set(Calendar.DAY_OF_MONTH, startday);if(cal.get(Calendar.DAY_OF_WEEK)==1||cal.get(Calendar.DAY_OF_WEEK)==7){hostDays.add(startday+"");}startday++;} }return hostDays;}public static boolean isLeapYear(int year) {return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);}public static int getLastDayOfMonth(int year, int month) {if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8|| month == 10 || month == 12) {return 31;}if (month == 4 || month == 6 || month == 9 || month == 11) {return 30;}if (month == 2) {if (isLeapYear(year)) {return 29;} else {return 28;}}return 0;}}

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