Question

在web.xml中，配置过滤器出现的问题

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

<display-name>Struts Blank Application</display-name>

<!-- Standard Action Servlet Configuration -->
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>

<!-- Standard Action Servlet Mapping -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

<!-- The Usual Welcome File List -->
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<filter>
<filter-name>OpenSessionInView</filter-name>
<filter-class>HibernateFactoryUtil.OpenSessionInView</filter-class>
</filter>

<filter-mapping>
<filter-name>OpenSessionInView</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

</web-app>

为什么<web-app>处总是出现个红色的大差？

Answer 1

你把顺序写错了,它是根据上面的dtd规范来的,你把鼠标移上错误那里去看,它有每个标签的先后顺序,看那filter和filter-mapping是写在servlet前面的,明白问题所在了么