index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="getminus.jsp" method="post">
請輸入第一個日期：<input type="date" name="date1" value="2020-05-15"/><br>
請輸入第二個日期：<input type="date" name="date2" value="2020-05-15"/><br>
<input type="submit" value="提交">
</form>
</body>
</html>
getminus.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
%>
<%
String datestr1=request.getParameter("date1");
String datestr2=request.getParameter("date2");
%>
<jsp:useBean id="strBean" class="com.StringUtil"></jsp:useBean>
<jsp:setProperty property="datestr1" name="strBean" value="<%=datestr1 %>"/>
<jsp:setProperty property="datestr2" name="strBean" value="<%=datestr2 %>"/>
<p>第一個日期爲：<jsp:getProperty property="datestr1" name="strBean"/></p>
<p>第二個日期爲：<jsp:getProperty property="datestr2" name="strBean"/></p>
<p>兩個日期時間差爲：：<jsp:getProperty property="minus" name="strBean"/></p>
</body>
</html>
package com;
import java.util.Calendar;
import java.util.Date;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class StringUtil {
private String datestr1;
private String datestr2;
private int minus;
public int getMinus() {
Calendar c1=this.getCalendar(datestr1);
Calendar c2=this.getCalendar(datestr2);
long t1=c1.getTimeInMillis();
long t2=c2.getTimeInMillis();
long t=1000*60*60*24;
minus=(int)((t2-t1)/t);
return minus;
}
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 void setMinus(int minus) {
this.minus=minus;
}
private Calendar getCalendar(String datestr) {
SimpleDateFormat shijian = new SimpleDateFormat("yyyyy-MM-dd");
Date date=null;
try {
date=shijian.parse(datestr);
}catch (ParseException e) {
e.printStackTrace();
}
Calendar c=Calendar.getInstance();
c.setTime(date);
return c;
}
}
運行截圖
