jsp文件放在webapp目录下
web.xml放在WEB-INF中
<servlet>
<servlet-name>WriteLogServlet</servlet-name>里面的WriteLogServlet
<servlet-class>com.db315.action.WriteLogServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>WriteLogServlet</servlet-name>
<url-pattern>/WriteLogServlet</url-pattern>
</servlet-mapping><servlet>
<servlet-name>WriteLogServlet</servlet-name>
<servlet-class>com.db315.action.WriteLogServlet</servlet-class>
</servlet>里面的WriteLogServlet

<servlet-mapping>
<servlet-name>WriteLogServlet</servlet-name>
<url-pattern>/WriteLogServlet</url-pattern>
</servlet-mapping>里面的WriteLogServlet
要一致<url-pattern>/WriteLogServlet</url-pattern>里的WriteLogServlet只是一个映射名
在jsp或其他页面调用他来调用这个servlet