通用日期转化

            public static Date parseDate(String str, String parsePatterns[]) throws ParseException {
/* 253*/        if (str == null || parsePatterns == null) {
/* 254*/            throw new IllegalArgumentException("Date and Patterns must not be null");
                }
/* 257*/        SimpleDateFormat parser = null;
/* 258*/        ParsePosition pos = new ParsePosition(0);
/* 259*/        for (int i = 0; i < parsePatterns.length; i++) {
/* 260*/            if (i == 0) {
/* 261*/                parser = new SimpleDateFormat(parsePatterns[0]);
                    } else {
/* 263*/                parser.applyPattern(parsePatterns[i]);
                    }
/* 265*/            pos.setIndex(0);
/* 266*/            Date date = parser.parse(str, pos);
/* 267*/            if (date != null && pos.getIndex() == str.length()) {
/* 268*/                return date;
                    }
                }

/* 271*/        throw new ParseException("Unable to parse the date: " + str, -1);
            }

 

 

public   class  DateUtil  ... {
    /**//**
     * 格式化的样式
     */
    private List<String> formatPatternList = new ArrayList<String>();

    /**//**
     * Logger for this class
     */
    private static final Logger logger = Logger.getLogger(DateUtil.class);

    private static DateUtil dateUtil = null;

    public static void main(String[] args) ...{
        Date date = DateUtil.getInstance().formatDate("2009.11");
        System.out.println(date.toLocaleString());
    }

    /**//**
     * 单例
     * 
     * @return DateUtil
     */
    public static synchronized DateUtil getInstance() ...{
        if (dateUtil == null)
            dateUtil = new DateUtil();
        return dateUtil;
    }

    /**//**
     * 格式化日期
     * 
     * @param str
     * @return Date
     */
    public Date formatDate(String str) ...{
        if (str == null) ...{
            if (logger.isInfoEnabled()) ...{
                logger.info("Date must not be null");
            }
            return new Date();
        }
        try ...{
            SimpleDateFormat format = null;
            ParsePosition pos = new ParsePosition(0);
            for (int i = 0; i < formatPatternList.size(); i++) ...{
                if (i == 0) ...{
                    format = new SimpleDateFormat(formatPatternList.get(0));
                }
                else ...{
                    format.applyPattern(formatPatternList.get(i));
                }
                pos.setIndex(0);
                Date date = format.parse(str, pos);
                if (date != null && pos.getIndex() == str.length()) ...{
                    return date;
                }
            }
        }
        catch (Exception e) ...{
            logger.error("parser date occur error." + e);
        }
        return new Date();
    }

    public List<String> getFormatPatternList() ...{
        return formatPatternList;
    }

    public void addFormatPattern(String formatPattern) ...{
        formatPatternList.add(formatPattern);
    }
    public void addFormatPatterns(Collection formatPatterns) ...{
        formatPatternList.addAll(formatPatterns);
    }

    public boolean removeFormatPattern(String formatPattern) ...{
        return formatPatternList.remove(formatPattern);
    }

    public void removeAllFormatPattern() ...{
        formatPatternList.clear();
    }

    private DateUtil() ...{
        /**//**
         * 初始一些日期样式
         */
        formatPatternList.add("yyyyMMdd HHmmss");
        formatPatternList.add("yyyyMMdd HHmm");
        formatPatternList.add("yyyyMMdd HH");
        formatPatternList.add("yyyyMMdd");
        formatPatternList.add("yyyyMM");
        formatPatternList.add("yyyy/MM/dd HH:mm:ss");
        formatPatternList.add("yyyy/MM/dd HH:mm");
        formatPatternList.add("yyyy/MM/dd HH");
        formatPatternList.add("yyyy/MM/dd");
        formatPatternList.add("yyyy/MM");
        formatPatternList.add("yyyy");
        // formatPatternList.add("MM/dd");
        formatPatternList.add("yyyy/MM/dd HH/mm/ss");
        formatPatternList.add("yyyy/MM/dd HH/mm");
        formatPatternList.add("yyyy-MM-dd HH:mm:ss");
        formatPatternList.add("yyyy-MM-dd HH:mm");
        formatPatternList.add("yyyy-MM-dd HH");
        formatPatternList.add("yyyy-MM-dd");
        formatPatternList.add("yyyy-MM");
        // formatPatternList.add("MM-dd");
        formatPatternList.add("yyyy-MM-dd HH-mm-ss");
        formatPatternList.add("yyyy-MM-dd HH-mm");
        formatPatternList.add("yyyy.MM.dd HH:mm:ss");
        formatPatternList.add("yyyy.MM.dd HH:mm");
        formatPatternList.add("yyyy.MM.dd HH");
        formatPatternList.add("yyyy.MM.dd");
        formatPatternList.add("yyyy.MM");
        // formatPatternList.add("MM.dd");
        formatPatternList.add("yyyy.MM.dd HH.mm.ss");
        formatPatternList.add("yyyy.MM.dd HH.mm");
        // formatPatternList.add("HH:mm:ss");
        // formatPatternList.add("HH:mm");
        formatPatternList.add("yyyyMMdd HHmmss");
    }
}