利用正则表达式匹配日期字符串格式并转换

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
public class DateConverter {
    
    public static Date parseDate(String dateStr, String format) throws ParseException {
        return new Date(new SimpleDateFormat(format).parse(dateStr).getTime());
    }
    
    public static String formatDate(Date date, String format) {
        return new SimpleDateFormat(format).format(date);
    }
    
    public Date convert(String source) {
        if (source == null)
            return null;
        source = source.trim();
        if ("".equals(source))
            return null;
        try {
            if (source.matches("^\\d{4}-\\d{1,2}-\\d{1,2}$"))//yyyy-MM-dd
                return parseDate(source, "yyyy-MM-dd");
            else if (source.matches("^\\d{4}/\\d{1,2}/\\d{1,2}$"))//yyyy/MM/dd
                return parseDate(source, "yyyy/MM/dd");
            else if (source.matches("^\\d{4}-\\d{1,2}-\\d{1,2} \\d{1,2}:\\d{1,2}:\\d{1,2}$"))//yyyy-MM-dd HH:mm:ss
                return parseDate(source, "yyyy-MM-dd HH:mm:ss");
            else if (source.matches("^\\d{4}/\\d{1,2}/\\d{1,2} \\d{1,2}:\\d{1,2}:\\d{1,2}$"))//yyyy/MM/dd HH:mm:ss
                return parseDate(source, "yyyy/MM/dd HH:mm:ss");
            else throw new IllegalArgumentException("Invalid date value '" + source + "'");
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }
}