一个自己写得日期工具
public static String DATE_FMT = "yyyy-MM-dd";public static String TIME_FMT = "yyyy-MM-dd HH:mm:ss";public static String SIMPLE_TIME_FMT = "yyyyMMddHHmmss";public SimpleDateFormat dfForm = null;/** * 格式化日期 * * @param sDate * @param sFmtFrom * @param sFmtTo * @return * @throws ParseException */public static String formatDate(String sDate, String sFmtFrom, String sFmtTo)throws ParseException {SimpleDateFormat sdfFrom = new SimpleDateFormat(sFmtFrom);SimpleDateFormat sdfTo = new SimpleDateFormat(sFmtTo);return sdfTo.format(sdfFrom.parse(sDate));}/** * 格式化日期 * * @param dt * @param sFmt * @return */public static String formatDate(Date dt, String sFmt) {if (dt == null || sFmt == null)return "";SimpleDateFormat sdfFrom = new SimpleDateFormat(sFmt);return sdfFrom.format(dt).toString();}/** * 格式化日期,yyyy-MM-dd * * @param dt * @return */public static String formatDate(Date dt) {return formatDate(dt, DATE_FMT);}/** * 格式化日期,yyyy-MM-dd HH:mm:ss * * @param dt * @return */public static String formatDateTime(Date dt) {return formatDate(dt, TIME_FMT);}/** * 格式化日期,yyyyMMddHHmmss * * @param dt * @return */public static String formatSimpleDate(Date dt) {return formatDate(dt, SIMPLE_TIME_FMT);}/** * 得到当前时间,yyyyMMddHHmmss * * @param args */public static String getCurrentSimpleTime() {Date dt = new Date();return formatDate(dt, SIMPLE_TIME_FMT);}/** * 得到当前时间,yyyy-MM-dd HH:mm:ss * * @param args */public static String getCurrentDateTime() {Date dt = new Date();return formatDate(dt, TIME_FMT);}/** * 得到当前时间,yyyy-MM-dd * * @param args */public static String getCurrentDate() {Date dt = new Date();return formatDate(dt, DATE_FMT);}/** * 得到当前时间 * * @return */public static Timestamp getNowTimestamp() {return Timestamp.valueOf(new SimpleDateFormat(TIME_FMT).format(new Date()));}/** * 转换日期格式 * @param date * @return */public static Timestamp conver2Timestamp(String date){return Timestamp.valueOf(date);}/** * * 方法描述：返回Date型日期，yyyy-MM-dd HH:mm:ss * @author ming.li * @time 2011-4-28 下午01:15:32 * * @param dateStr * @return * @throws ParseException */public static Date string2Date(String dateStr) throws ParseException{SimpleDateFormat sdf=new SimpleDateFormat(TIME_FMT);return sdf.parse(dateStr);}/** * * 方法描述：获取近半年时间,yyyyMM * @author ming.li * @time 2011-4-28 下午01:15:35 * * @return */public static String[] getNearHalfYear(){String[] halfYear=new String[6];String today = getCurrentDate();String yearTemp=today.substring(0, 4);String monthTemp=today.substring(5, 7);int year = Integer.parseInt(yearTemp);int month = Integer.parseInt(monthTemp)+1;if(month>6){for(int i=0;i<6;i++){month--;halfYear[i]=yearTemp+month;}}else{switch(month){case 6:{halfYear[0]=yearTemp+"05";halfYear[1]=yearTemp+"04";halfYear[2]=yearTemp+"03";halfYear[3]=yearTemp+"02";halfYear[4]=yearTemp+"01";halfYear[5]=(year-1)+"12";break;}case 5:{halfYear[0]=yearTemp+"04";halfYear[1]=yearTemp+"03";halfYear[2]=yearTemp+"02";halfYear[3]=yearTemp+"01";halfYear[4]=(year-1)+"12";halfYear[5]=(year-1)+"11";break;}case 4:{halfYear[0]=yearTemp+"03";halfYear[1]=yearTemp+"02";halfYear[2]=yearTemp+"01";halfYear[3]=(year-1)+"12";halfYear[4]=(year-1)+"11";halfYear[5]=(year-1)+"10";break;}case 3:{halfYear[0]=yearTemp+"02";halfYear[1]=yearTemp+"01";halfYear[2]=(year-1)+"12";halfYear[3]=(year-1)+"11";halfYear[4]=(year-1)+"10";halfYear[5]=(year-1)+"09";break;}case 2:{halfYear[0]=yearTemp+"01";halfYear[1]=(year-1)+"12";halfYear[2]=(year-1)+"11";halfYear[3]=(year-1)+"10";halfYear[4]=(year-1)+"09";halfYear[5]=(year-1)+"08";break;}case 1:{halfYear[0]=(year-1)+"12";halfYear[1]=(year-1)+"11";halfYear[2]=(year-1)+"10";halfYear[3]=(year-1)+"09";halfYear[4]=(year-1)+"08";halfYear[5]=(year-1)+"07";break;}}}return halfYear;}?