JavaWeb之Jsp的page指令(配置错误处理页面)

page.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" errorPage="errorPage.jsp" %><!-- 指定错误处理的页面 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		int a = 1/0;/* 此页面出错了,就会转发到指定的错误处理页面 */
	 %>
</body>
</html>

errorPage.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" isErrorPage="true"%><!-- 错误处理页面,只有设置了isErrorPage="true",才可以使用exception -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1 style="color:orange;">您访问的页面出错了!!!</h1>
	<%
		exception.printStackTrace();
	 %>
</body>
</html>

如果单独为每个页面指定错误处理页面,这样太繁琐了。可以在web.xml文件中使用<erroe-page>元素为整个Web应用程序设置错误处理页面。

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Javaweb01</display-name>
  
  <error-page>
  	<error-code>404</error-code>
  	<location>/jsp/404.jsp</location>
  </error-page>
  
  <error-page>
  	<error-code>500</error-code>
  	<location>/jsp/500.jsp</location>
  </error-page>
  
</web-app>

page.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		int a = 1/0;/* 此页面出错了,变会转发到指定的错误处理页面 */
	 %>
</body>
</html>

404.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1 style="color:orange;">404错误处理页面</h1>
</body>
</html>

500.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1 style="color:orange;">500错误处理页面</h1>
</body>
</html>

访问:http://localhost:8080/Javaweb01/jsp/page1.jsp,由于不存在page1.jsp,响应状态码为404,因此会转发到404.jsp。


访问:http://localhost:8080/Javaweb01/jsp/page.jsp,由于page.jsp出错,响应状态码为500,因此会转发到500.jsp。


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转载自blog.csdn.net/qq_41706150/article/details/80443616