一、编写
1、index.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form action="login.jsp">
<font size=4 face="Verdana" color=#120292>
<marquee>online banking system</marquee>
<br><br>
<table cellspacing=5 cellpadding="5" bgcolor="#959999" colspan=2 rowspan=2 align="center">
<tr>
<td>bank customer authentication form</td>
</tr>
<tr>
<td>enter customer id:</td>
<td><input type="text" name="name"/></td>
</tr>
<tr>
<td>enter password:</td>
<td><input type="text" name="password"/></td>
</tr>
</table>
<table align="center">
<tr>
<td><input type="submit" value="login" /></td>
<td><input type="reset" value="cancel" /></td>
</tr>
</table>
</font>
</form>
</body>
</html>
2、login.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <%@ page errorPage="error.jsp" %><!--添加-->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%
String user=request.getParameter("name");
String password=request.getParameter("password");
int p=Integer.parseInt(password);
if(user.equals("John")&& p==123){
out.println("Welcome to online banking system");
out.println(" login successful");
}
else{
out.println("login unsuccessful");
}
%>
</body>
</html>
3、error.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>An exception has occurred</h1>
Exception Class:<%= pageContext.getException() %>
<form action="index.jsp">
<input type="submit" value="return" />
</form>
</body>
</html>
4、web.xml
在</web-app>之前加入以下代码
<error-page>
<exception-type>java.lang.NumberFormatException</exception-type>
<location>/error.jsp</location>
</error-page>
二、运行