日期格式化工具类

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateUtil {
public static final String FMT_FORE = "yyyy-MM-dd HH:mm:ss";
public static final String FMT_BACK = "yyyy年MM月dd日";
/**
* 日期工具类
* @param date  传入的date类型的日期
* @param fmt   传入的日期显示格式
* @return
*/
public static String formatDate(Date date,String fmt) {
SimpleDateFormat sdf = new SimpleDateFormat(fmt);
return sdf.format(date);
}
/**
* 日期工具类
* @param dateStr  传入的String类型的日期
* @param fmt   传入的日期显示格式
* @return
*/
public static String formatDate(String dateStr,String fmt){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

try {
Date date = sdf.parse(dateStr);
return formatDate(date, fmt);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}
//测试
/*public static void main(String[] args) {
Date date = new Date();
System.out.println(DateUtil.formatDate(date, DateUtil.FMT_BACK));
System.out.println(DateUtil.formatDate(date, DateUtil.FMT_FORE));

String dateString = "2016-03-05 12:45:08";
System.out.println(DateUtil.formatDate(dateString,  DateUtil.FMT_BACK));
System.out.println(DateUtil.formatDate(dateString,  DateUtil.FMT_FORE));
}*/
}