Java如何检查日期格式是否正确？

在Java编程中，如何检查日期格式是否正确？

以下示例演示如何使用String类的matches()方法检查日期格式是否正确。

package com.yiibai;

public class CheckDateFormat { public static void main(String[] argv) { boolean isDate = false; String date1 = "9-15-1998"; String date2 = "1997-08-16"; String datePattern = "\\d{4}-\\d{1,2}-\\d{1,2}"; isDate = date1.matches(datePattern); System.out.println("Date :" + date1 + ": matches with the this date Pattern:" + datePattern + "Ans:" + isDate); isDate = date2.matches(datePattern); System.out.println("Date :" + date2 + ": matches with the this date Pattern:" + datePattern + "Ans:" + isDate); } } 

Java

上述代码示例将产生以下结果 -

Date :8-05-1998: matches with the this date Pattern:\d{4}-\d{1,2}-\d{1,2}Ans:false
Date :1997-08-16: matches with the this date Pattern:\d{4}-\d{1,2}-\d{1,2}Ans:true

Shell

示例-2

以下是检查日期是否正确格式的另一个示例。

package com.yiibai;

import java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; public class CheckDateFormat2 { public static void main(String args[]) { List dates = new ArrayList(); dates.add("1990-12-21"); dates.add("1990-12-31"); dates.add("1990-12-32"); dates.add("09-12-12"); dates.add("2001-02-10"); String regex = "^([0-9]{4})-(1[0-2]|0[1-9])-(3[01]|[12][0-9]|0[1-9])$"; Pattern pattern = Pattern.compile(regex); for (Object date : dates) { Matcher matcher = pattern.matcher((CharSequence) date); System.out.println(date + " : " + matcher.matches()); } } } 

Java

上述代码示例将产生以下结果 -

1990-12-21 : true
1990-12-31 : true
1990-12-32 : false
09-12-12 : false
2001-02-10 : true