출처 : http://www.rgagnon.com/javadetails/java-0099.html
Using DateFormat
import java.text.*;
public class DateUtils {
public static boolean isValidDateStr(String date) {
try {
DateFormat df =
DateFormat.getDateInstance
(DateFormat.SHORT); // YYYY-MM-DD
df.setLenient(false); // this is important!
df.parse(date);
}
catch (ParseException e) {
return false;
}
catch (IllegalArgumentException e) {
return false;
}
return true;
}
public static void main(String[] args) {
System.out.println(" 1900-12-13 valid ? "
+ DateUtils.isValidDateStr("1900-12-13"));
// "1990-12/13" throws a ParseException
System.out.println(" 1900-12/13 valid ? "
+ DateUtils.isValidDateStr("1900-12/13"));
// "1990-13-12" throws a IllegalArgumentException
System.out.println(" 1900-13-12 valid ? "
+ DateUtils.isValidDateStr("1900-13-12"));
/*
* output :
* 1900-12-13 valid ? true
* 1900-12/13 valid ? false
* 1900-13-12 valid ? false
*/
}
}
package com.rgagnon.howto;
import java.text.*;
public class DateUtils {
public static boolean isValidDateStr(String date, String format) {
try {
SimpleDateFormat sdf = new SimpleDateFormat(format);
sdf.setLenient(false);
sdf.parse(date);
}
catch (ParseException e) {
return false;
}
catch (IllegalArgumentException e) {
return false;
}
return true;
}
public static void main(String[] args) {
System.out.println(" 1900-12-13 valid ? "
+ DateUtils.isValidDateStr("1900-12-13","yyyy-MM-dd"));
// "1990-12/13" throws a ParseException
System.out.println(" 1900-12/13 valid ? "
+ DateUtils.isValidDateStr("1900-12/13","yyyy-MM-dd"));
// "1990-13-12" throws a IllegalArgumentException
System.out.println(" 1900-13-12 valid ? "
+ DateUtils.isValidDateStr("1900-13-12","yyyy-MM-dd"));
/*
* output :
* 1900-12-13 valid ? true
* 1900-12/13 valid ? false
* 1900-13-12 valid ? false
*/
}
}
Using GregorianCalendar
import java.util.*;
public class jtest {
public static void main(String args[]) {
try {
GregorianCalendar gc = new GregorianCalendar();
gc.setLenient(false); // must do this
gc.set(GregorianCalendar.YEAR, 2003);
gc.set(GregorianCalendar.MONTH, 42);// invalid month
gc.set(GregorianCalendar.DATE, 1);
gc.getTime(); // exception thrown here
}
catch (Exception e) {
e.printStackTrace();
}
}
}
출처 : http://www.dreamincode.net/forums/topic/14886-date-validation-using-simpledateformat/
// date validation using SimpleDateFormat
// it will take a string and make sure it's in the proper
// format as defined by you, and it will also make sure that
// it's a legal date
public boolean isValidDate(String date)
{
// set date format, this can be changed to whatever format
// you want, MM-dd-yyyy, MM.dd.yyyy, dd.MM.yyyy etc.
// you can read more about it here:
// http://java.sun.com/j2se/1.4.2/docs/api/index.html
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
// declare and initialize testDate variable, this is what will hold
// our converted string
Date testDate = null;
// we will now try to parse the string into date form
try
{
testDate = sdf.parse(date);
}
// if the format of the string provided doesn't match the format we
// declared in SimpleDateFormat() we will get an exception
catch (ParseException e)
{
errorMessage = "the date you provided is in an invalid date" +
" format.";
return false;
}
// dateformat.parse will accept any date as long as it's in the format
// you defined, it simply rolls dates over, for example, december 32
// becomes jan 1 and december 0 becomes november 30
// This statement will make sure that once the string
// has been checked for proper formatting that the date is still the
// date that was entered, if it's not, we assume that the date is invalid
if (!sdf.format(testDate).equals(date))
{
errorMessage = "The date that you provided is invalid.";
return false;
}
// if we make it to here without getting an error it is assumed that
// the date was a valid one and that it's in the proper format
return true;
} // end isValidDate
