在 web.xml 中配置 error-page

		
<error-page>
	<error-code>400</error-code>
	<location>/error.jsp</location>
</error-page>

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

<error-page>
	<error-code>500</error-code>
	<location>/error.jsp</location>
</error-page>
<!-- java.lang.Exception异常错误,依据这个标记可定义多个类似错误提示 -->
<error-page>
	<exception-type>java.lang.Exception</exception-type>
	<location>/error.jsp</location>
</error-page>
<!-- java.lang.NullPointerException异常错误,依据这个标记可定义多个类似错误提示 -->
<error-page>
	<exception-type>java.lang.NullPointerException </exception-type>
	<location>/error.jsp</location>
</error-page>

<error-page>
	<exception-type>javax.servlet.ServletException</exception-type>
	<location>/error.jsp</location>
</error-page>