计算两个日期相差的天数

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用来输入两个日期的表单index.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML>
<html>
<head>
<title>计算两个日期相差的天数</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

<style type="text/css">
table{
border: 1px solid;
border-color: green;
font-size: 12px;
color:gray;

}
input{
font-size: 12px;
color:gray;
}
font{
color:orangered;
font-size:12px;
}
</style>
</head>

<body>

<form action="getminus.jsp" method="post">
<table>
<tr>
<td align="right">请输入第一个日期：</td>
<td><input type="text" name="datestr1" />
<font>格式为：2012-07-18</font>
</td>
</tr>
<tr>
<td align="right">请输入第二个日期：</td>
<td><input type="text" name="datestr2" />
<font>格式为：2012-07-18</font>
</td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="提交" /></td>
</tr>
</table>
</form>
</body>
</html>

用户提交之后转向getminus.jsp:

通过 request.getParameter()获取表单中的属性，并通过jsp:setProperty 赋值给JavaBean

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
request.setCharacterEncoding("UTF-8");
%>
<!DOCTYPE HTML>
<html>
<head>
<title>计算两个日期相差的天数</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

<style type="text/css">
table{
border: 1px solid;
border-color: green;
color: green;
font-size: 12px;
}
</style>
</head>
<body>
<%
String dateStr1 = request.getParameter("datestr1");
String dateStr2 = request.getParameter("datestr2");
%>

<jsp:useBean id="strBean" class="com.wgh.bean.StringUtil"></jsp:useBean>

<jsp:setProperty property="dateStr1" name="strBean" value="<%=dateStr1 %>"/>

<jsp:setProperty property="dateStr2" name="strBean" value="<%=dateStr2 %>"/>
<table>
<tr>
<td align="right">第一个日期为：</td>
<td>

<jsp:getProperty property="dateStr1" name="strBean"/>
</td>
</tr>
<tr>
<td align="right">第二个日期为：</td>
<td>

<jsp:getProperty property="dateStr2" name="strBean"/>
</td>
</tr>
<tr >
<td align="right">两个日期相差的天数为：</td>
<td >

<jsp:getProperty property="minus" name="strBean"/>
</td>
</tr>
</table>
</body>
</html>

StringUtil.java:

package com.wgh.bean;

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

public class StringUtil {
private String dateStr1;//第一个日期字符串
private String dateStr2;//第二个日期字符串
private int minus;//两个日期的差
public String getDateStr1() {
return dateStr1;
}
public void setDateStr1(String dateStr1) {
this.dateStr1 = dateStr1;
}
public String getDateStr2() {
return dateStr2;
}
public void setDateStr2(String dateStr2) {
this.dateStr2 = dateStr2;
}
public int getMinus() {
Calendar c1 = this.getCalendar(dateStr1);//根据第一个日期字符串获得Calendar对象
Calendar c2 = this.getCalendar(dateStr2);//根据第二个日期字符串获得Calendar对象
long t1 = c1.getTimeInMillis();//获得此对象的时间值，以毫秒为单位
long t2 = c2.getTimeInMillis();//获得此对象的时间值，以毫秒为单位
long t = 1000*60*60*24;//1000毫秒*60秒*60分钟*24小时
minus = (int)((t2-t1)/t);//获得两个日期相差的天数
return minus;
}
public void setMinus(int minus) {
this.minus = minus;
}
public Calendar getCalendar(String dateStr) {
Date date =null;//声明一个Date类型的对象
SimpleDateFormat format = null;//声明格式化日期的对象
Calendar calendar = null;
if(dateStr!=null){
format = new SimpleDateFormat("yyyy-MM-dd");//创建日期的格式化类型

calendar = Calendar.getInstance();//创建一个Calendar类型的对象
try { //forma.parse()方法会抛出异常
date = format.parse(dateStr);//解析日期字符串，生成Date对象
calendar.setTime(date);//使用Date对象设置此Calendar对象的时间
} catch (ParseException e) {
e.printStackTrace();
}
}
return calendar;
}
}

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