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
