本文实例讲述了Java基于正则实现的日期校验功能。分享给大家供大家参考，具体如下：
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private void checkDate() throws IOException {
// 4种分隔符
String sep = "[-\\./_]";
// 年份
String strPattern = "^(19[4-9]\\d|20\\d{2})" + sep;
strPattern += "(";
// 月（1,3,5,7,8,10,12)
strPattern += "((0?[13578]|1[02])" + sep + "(0?[1-9]|[12][0-9]|3[01]))|";
// 月(4,6,9,11)
strPattern += "((0?[469]|11)" + sep + "(0?[1-9]|[12][0-9]|30))|";
// 月（2）
strPattern += "((2)" + sep + "(0?[1-9]|[12]\\d))";
strPattern += ")$";
Pattern p = Pattern.compile(strPattern);
Matcher m = p.matcher("");
int count = 0;
String fileName = ExcelGene.class.getResource("date.txt").getFile();
BufferedReader br = new BufferedReader(new FileReader(fileName));
String line = null;
while ((line = br.readLine()) != null) {
count++;
if (line.trim().length() > 0) {
m.reset(line);
if (!m.find()) {
System.out.println(count + " " + line);
} else {
String year = m.group(1);
String month = m.group(4);
month = month == null ? m.group(7) : month;
month = month == null ? m.group(10) : month;
String date = m.group(5);
date = date == null ? m.group(8) : date;
date = date == null ? m.group(11) : date;
System.out.println(year + "年" + month + "月" + date + "日");
}
}
}
}
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希望本文所述对大家java程序设计有所帮助。