1、include指令的使用
（1）编写一个名为includeCopyRight.jsp的页面，页面的浏览效果如下：
要求“2016”这个值可以实现动态更新。请写出页面代码：
1 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 2 <%@ page import="java.util.*" %> 3 <html> 4 <head> 5 <title>includeCopyRight</title> 6 </head> 7 <body> 8 <% 9 Calendar cal = Calendar.getInstance(); 10 String year =String.valueOf(cal.get(Calendar.YEAR)); 11 %> 12 <center> 13 <p>..............................................................................................................................................</p> 14 <p>颜志军(http://www.yanzhijun.net) 版权所有 2010-<%=year %></p> 15 </body> 16 </html>
（2）编写名为shiyan3_2_1.jsp和shiyan3_2_2.jsp两个JSP页面，页面内容自定，但要求使用include指令将includeCopyRight.jsp页面中显示的版权信息包含进shiyan3_2_1.jsp和shiyan3_2_2.jsp页面中。请写出相应代码：
shiyan1:
1 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 2 <html> 3 <body> 4 <%! 5 double multi(double x, double y) { 6 return x * y; 7 } 8 %> 9 <% 10 double x = 3.56; 11 double y = 18; 12 out.print("调用方法计算" + x + "与" + y + "之积："); 13 out.print(multi(x, y) + "<br/>"); 14 %> 15 <%@include file="includeCopyRight.jsp" %> 16 </body> 17 </html>
shiyan2:
1 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 2 <html> 3 <body> 4 <%! 5 int count = 0; 6 synchronized void setCount(){ 7 count++; 8 } 9 %> 10 <% 11 setCount(); 12 out.println("您是第"+count+"个访问本站的用户"); 13 %> 14 <%@ include file="includeCopyRight.jsp" %> 15 </body> 16 </html>
（3）编写名为shiyan3_2_3.jsp的页面，其中显现“请输入两个整数，单击提交按钮求这两个整数的平方差”。再编写一个名为shiyan3_2_4.jsp页面，其中显示表单，输入两个整数后，单击提交按钮后可以显示出两数的平方差，效果如下图所示。要求在shiyan3_2_3.jsp包含shiyan3_2_4.jsp。
shiyan3_2_3.jsp:
1 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 2 <html> 3 <head> 4 <title>平方差</title> 5 </head> 6 <body> 7 <P>输入两个整数，单击提交按钮求这两个整数的平方差</P> 8 <%@ include file="shiyan3_2_4.jsp" %> 9 <% 10 String str1 = request.getParameter("one"); 11 String str2 = request.getParameter("two"); 12 try { 13 int num1 = Integer.parseInt(str1); 14 15 int num2 = Integer.parseInt(str2); 16 int num = num1*num1-num2*num2; 17 out.println("你输入的两个整数的平方差是："+num); 18 }catch (NumberFormatException e){ 19 } 20 %> 21 </body> 22 </html>
shiyan3_2_4.jsp:
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>计规范化算</title> </head> <body> <form action="" method="post" name="form"> 整数1:<input type="text" name="one"><br><br> 整数2:<input type="text" name="two"><br><br> <input type="submit" value="提交" name="submit"> </form> </body> </html>