javaweb：通过web.xml实现错误页面的定制

常见的错误页面类型有很多，这里我们以404和500为例，404是找不到需要访问的资源，而500是服务器的配置错误。

我们首先建立两个页面，一个是404.jsp，一个是500.jsp

404.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>404</title>
</head>
<body>
<img alt="" src="/error/images/404.png" width="800" height="600">
</body>
</html>

500.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>500</title>
</head>
<body>
<img alt="" src="/error/images/500.png" width="800" height="600">
</body>
</html>

再写一个测试500的页面

500test.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>500test</title>
</head>
<body>

<% int i = 1/0;%>

</body>
</html>

配置web.xml文件

    <error-page>
        <error-code>404</error-code>
        <location>/error/404.jsp</location>
    </error-page>
    
    <error-page>
        <error-code>500</error-code>
        <location>/error/500.jsp</location>
    </error-page>