java日期转换通用类.doc

import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;/* * 日期处理共通类 * * author tangsl * 2012-05-21 */public class DateUtil /* * 日期格式化 */public static final SimpleDateFormat YYYY_MM_DD = new SimpleDateFormat(yyyy-MM-dd);/* * 月格式化 */public static final SimpleDateFormat YYYY_MM = new SimpleDateFormat(yyyy-MM);/* * 年格式化 */public static final SimpleDateFormat YYYY = new SimpleDateFormat(yyyy);/* * 年月日分格式化 */public static final SimpleDateFormat YYYYMMDDHHMM = new SimpleDateFormat(yyyyMMddHHmm);/* * 年 */public static final int YEAR = 1;/* * 月 */public static final int MONTH = 2;/* * 日 */public static final int DAY = 3;/* * 时 */public static final int HOUR = 4;/* * 分 */public static final int MINUTE = 5;/* * 秒 */public static final int SECOND = 6;/* yyyy-MM-dd. */public static final String DATE_FORMAT_ONE = yyyy-MM-dd;/* yyyy/MM/dd. */public static final String DATE_FORMAT_TWO = yyyy/MM/dd;/* yyyyMMdd. */public static final String DATE_FORMAT_THREE = yyyyMMdd;/* yyyyMM. */public static final String DATE_FORMAT_FOUR = yyyyMM;/* yyyy-MM-dd HH:mm:ss. */public static final String DATE_FORMAT_FIVE = yyyy-MM-dd HH:mm:ss;/* yyyy. */public static final String DATE_FORMAT_SIX = yyyy;/* MM. */public static final String DATE_FORMAT_SEVEN = MM;/* yyyy/MM/dd HH:mm:ss. */public static final String DATE_FORMAT_EIGHT = yyyy/MM/dd HH:mm:ss;/* HH:mm:ss. */public static final String DATE_FORMAT_NINE = HH:mm:ss;/* yy/MM/dd. */public static final String DATE_FORMAT_TEN = yy/MM/dd;/* yyyy/M/d. */public static final String DATE_FORMAT_ELEVEN = yyyy/M/d;/* yyyy/MM. */public static final String DATE_FORMAT_TWELEVE = yyyy/MM;/* yyyyMMddHHmmssSSS. */public static final String DATE_FORMAT_THIRTEEN = yyyyMMddHHmmssSSS;/* yyMMdd. */public static final String DATE_FORMAT_FOURTEEN = yyMMdd;/* yyyy.MM.dd. */public static final String DATE_FORMAT_SIXTEEN = yyyy.MM.dd;/* yyyyMMddHHmmss. */public static final String DATE_FORMAT_SEVENTEEN = yyyyMMddHHmmss;/* yyyy年MM月dd日 */public static final String DATE_FORMAT_EIGHTEEN = yyyy年MM月dd日;/* HH:mm. */public static final String DATE_FORMAT_NINETEEN = HH:mm;/* yyyy-MM-dd HH24:mm:ss. */public static final String DATE_FORMAT_TWENTY = yyyy-MM-dd HH24:mm:ss;/* yyyy年MM月dd日HH24时MM分ss秒 */public static final String DATE_FORMAT_TWENTY_ONE = yyyy年MM月dd日HH时mm分ss秒;/* yyyy年MM月 */public static final String DATE_FORMAT_TWENTY_TWO = yyyy年MM月;/* yyyy-MM. */public static final String DATE_FORMAT_TWENTY_THREE = yyyy-MM;/* yyyyMMddHHmm. */public static final String DATE_FORMAT_TWENTY_FOUR = yyyyMMddHHmm;/* * 得到当前日期 * * return */public static Date getNowDate() Calendar objCa = Calendar.getInstance();return objCa.getTime();/* * 得到某种格式的当前日期 * * param strFormat * return */public static String getNowDate(String strFormat) Calendar objCa = Calendar.getInstance();SimpleDateFormat objFormat = new SimpleDateFormat(strFormat);String strYear = objFormat.format(objCa.getTime();return strYear;/* * 比较两个日期的大小 * * param d1 * param d2 * return */public static int compareDate(String d1, String d2) try Date dt1 = YYYY_MM_DD.parse(d1);Date dt2 = YYYY_MM_DD.parse(d2);if (dt1.getTime() dt2.getTime() return 1; else if (dt1.getTime() 12) monthInt = 1;+yearInt;Date next = formateStringToDate(yearInt + - + monthInt + -1);return next;/* * 根据给定的天数得到偏移的日期，正数为之后的日期，负数为之前的日期 * * param days 天数 * return 日期的秒数 */public static Long getDateOffset(int days) GregorianCalendar gc = new GregorianCalendar();int year = gc.get(Calendar.YEAR);int month = gc.get(Calendar.MONTH);int dayOfMonth = gc.get(Calendar.DAY_OF_MONTH);/ 截掉时间gc = new GregorianCalendar(year, month, dayOfMonth);long millis = gc.getTimeInMillis() + days * 24 * 60 * 60 * 1000L;Date date = new Date(millis);return date.getTime() / 1000;/* * 根据给定的日期，得到该月的天数 * * par