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JSP basic grammar experiment

2022-07-19 01:07:00 【Junior Hyena】

example 3.6 Handling of page exceptions .
establish example3_6.jsp page , Use page Instructions
Of errorPage Property specifies the page to which the page will turn when an exception occurs . This program performs division
count , Such as fruit except Count by 0 , take Meeting Throw Out One individual Count learn shipment count different often , from errorPage="
example3_6_error.jsp" It can be seen that , Program designation example3_6_error.jsp Handle it
abnormal . To create a example3_6_error.jsp page , Use page The directive isErrorPage Belong to
Property is specified as error page , This page can use exception Exception object handling error messages .
example3_6.jsp The specific code is as follows ：

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8" errorPage="example3_6_error.jsp"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>example3_6.jsp</title>
</head>
<body>
<%
int x1=5;
int x2=0;
int x3=x1/x2;
out .print (x3);
%>
</body>
</html>

example3_6_error.jsp The specific code is as follows ：

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8" isErrorPage="true"%>
<!DOCTYPE html >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>example3_6error.jsp</title>
</head>
<body>
 There is an error , Error is as follows ：<br/>
<hr>
<%=exception.getMessage() %>
</body>
</html>

example 3.7
To write example3_7.jsp page , Page shows “ Please enter two integers , Click Submit
Button to find the square difference between these two integers ”. Write another example3_7_input.jsp page , It is obvious
Show form , Enter two integers , Click the submit button to display the square difference between the two numbers , The effect is as follows
As shown in the figure . Ask for in example3_7.jsp The page contains example3_7_input.jsp.
example3_7.jsp The specific code is as follows ：

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%>
<!DOCTYPE html >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>example3_7.jsp</title>
</head>
<body>
<p> Please enter two integers , Click the submit button to find the square difference between the two numbers </p>
<%@ include file="example3_7input.jsp" %>
</body>
</html>

example3_7_input.jsp The specific code is as follows ：

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%>
<!DOCTYPE html >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>example3_7_inpute.jsp</title>
</head>
<body>
<form action="" method="post">
 Integers 1： <input type="text" name="n1"/>
<br/><br/>
 Integers 2： <input type="text" name="n2"/>
<br/><br/><input type="submit" value=" Submit "/>
</form>
<%
 String n1=request.getParameter("n1");
 String n2=request.getParameter("n2");
 if(n1!=null&n2!=null){
 int a,b;
 try{
 a=Integer.parseInt(n1);
 b=Integer.parseInt(n2); 
%>
<p> The square difference between the two integers you enter is ：<%=a*a-b*b %></p>
<%
 }
 catch(Exception e){
 out.print(" Please enter two integers ！");
 }
 }
%>
</body>
</html>
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本文为[Junior Hyena]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/200/202207170000394320.html

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