1. Write jsp page on webapp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>这是404页面</h1>
</body>
</html>
2. Configure on web.xml
<error-page>
<error-code>404</error-code>
<location>/error/404.jsp</location>
</error-page>