Java时间帮助类DateUtil

来源：互联网发布：mysql match 完全匹配编辑：程序博客网时间：2024/04/30 02:25

package com.xy.util;

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

public class DateUtil
{

public static final String yyMMdd = "yy-MM-dd";
public static final String yyyyMMdd = "yyyy-MM-dd";
public static final String HHmmss = "HH:mm:ss";
public static final String yyyyMMddHHmmss = "yyyy-MM-dd HH:mm:ss";
public static final String yyMMddHHmmss = "yy-MM-dd HH:mm:ss";

public static Date parseToDate(String s, String style)
{
  SimpleDateFormat simpleDateFormat = new SimpleDateFormat();
  simpleDateFormat.applyPattern(style);
  Date date = null;
  if (s == null || s.length() < 8) return null;
  try
  {
   date = simpleDateFormat.parse(s);
  }
  catch (ParseException e)
  {
   e.printStackTrace();
  }
  return date;
}

public static String parseToString(String s, String style)
{
  SimpleDateFormat simpleDateFormat = new SimpleDateFormat();
  simpleDateFormat.applyPattern(style);
  Date date = null;
  String str = null;
  if (s == null || s.length() < 8) return null;
  try
  {
   date = simpleDateFormat.parse(s);
   str = simpleDateFormat.format(date);
  }
  catch (ParseException e)
  {
   e.printStackTrace();
  }
  return str;
}

public static String parseToString(Date date, String style)
{
  SimpleDateFormat simpleDateFormat = new SimpleDateFormat();
  simpleDateFormat.applyPattern(style);
  String str = null;
  if (date == null) return null;
  str = simpleDateFormat.format(date);
  return str;
}

}

使用方法：

List<Student> stus = sdao.getAllStu();

for (int i = 0; i < stus.size(); i++)
  {
   System.out.print(stus.get(i).getSname());
   System.out.print(DateUtil.parseToString(stus.get(i).getSbirth(), DateUtil.yyyyMMdd));
   System.out.print("\n");
  }