java得出两个日期之间所有日期

近日老要跑系统日志，每次发生问题要遍历每日的情况。代码改了好几次，每次输入的日期变化，都要修改不少代码。于是写了个日期类来调用。

包含以下功能

1.判断是否为闰年

2.判断一个月有几天

3.得出两个日期直接所有日期

package com.javaer.common;

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

/**
* java时间类
*
* @author mc2
*
*/
public class JTime {
static String dateFormat = "yyyy-MM-dd";
static SimpleDateFormat format = new SimpleDateFormat(dateFormat);

/**
* 获取两个日期之间所有的日期
* @param date1
* @param date2
* @return
*/
public static ArrayList days(String date1, String date2) {
ArrayList L = new ArrayList();
if (date1.equals(date2)) {
System.out.println("两个日期相等!");
return L;
}

String tmp;
if (date1.compareTo(date2) > 0) { // 确保 date1的日期不晚于date2
tmp = date1;
date1 = date2;
date2 = tmp;
}

tmp = format.format(str2Date(date1).getTime() + 3600 * 24 * 1000);

int num = 0;
while (tmp.compareTo(date2) < 0) {
L.add(tmp);
num++;
tmp = format.format(str2Date(tmp).getTime() + 3600 * 24 * 1000);
}

if (num == 0)
System.out.println("两个日期相邻!");
return L;
}

private static Date str2Date(String str) {
if (str == null)
return null;

try {
return format.parse(str);
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}

/**
* 判断是否闰年
*
* @param year
* @return
*/
public static boolean isLeapYear(int year) {
return (year % 400 == 0) || ((year % 4 == 0) && (year % 100 != 0));
}

/**
* 一个月有几天
*
* @param year
* @param month
* @return
*/
public static int dayInMonth(int year, int month) {
boolean yearleap = isLeapYear(year);
int day;
if (yearleap && month == 2) {
day = 29;
} else if (!yearleap && month == 2) {
day = 28;
} else if (month == 4 || month == 6 || month == 9 || month == 11) {
day = 30;
} else {
day = 31;
}
return day;
}

/**
* @param args
*/
public static void main(String[] args) {
JTime jt = new JTime();
System.out.println(jt.days("2012-02-02", "2012-03-23"));
}

}

结果

[2012-02-03, 2012-02-04, 2012-02-05, 2012-02-06, 2012-02-07, 2012-02-08, 2012-02-09, 2012-02-10, 2012-02-11, 2012-02-12, 2012-02-13, 2012-02-14, 2012-02-15, 2012-02-16, 2012-02-17, 2012-02-18, 2012-02-19, 2012-02-20, 2012-02-21, 2012-02-22, 2012-02-23, 2012-02-24,
2012-02-25, 2012-02-26, 2012-02-27, 2012-02-28, 2012-02-29, 2012-03-01, 2012-03-02, 2012-03-03, 2012-03-04, 2012-03-05, 2012-03-06, 2012-03-07, 2012-03-08, 2012-03-09, 2012-03-10, 2012-03-11, 2012-03-12, 2012-03-13, 2012-03-14, 2012-03-15, 2012-03-16, 2012-03-17,
2012-03-18, 2012-03-19, 2012-03-20, 2012-03-21, 2012-03-22]

首发于http://java-er.com - http://java-er.com/blog/java-time-days/