然后添加<Context path="虚拟目录" docBase="硬盘目录" debug="0" reloadable="true" crossContext="true"/>  

2、禁止tomcat目录浏览,将listings设为false

    <servlet>
        <servlet-name>default</servlet-name>
        <servlet-class>
          org.apache.catalina.servlets.DefaultServlet
        </servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>0</param-value>
        </init-param>
        <init-param>
            <param-name>listings</param-name>
            <param-value>false</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

3、设置友好错误页面，配置web.xml

   <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>

4、在IE中直接打开其他扩展名的文件

   为了让能在IE浏览器中自动打开其他扩展文件名的文件的设置：
   需要在WEB.XML中进行如下的设置：
   在WEB.XML中添加<mime-mapping>,其中: 
      <extension>: 文件的扩展名 
      <mime-type>: 除了该类型文件的可执行文件,同WINDOW注册表中的  /HKEY_CLASSES_ROOT下该类文件的Content Type 的值一样.

如能在IE中自动打开DOC，XLS，PDF文件的配置如下:

<?xml version="1.0" ?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 1.2//EN"  "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
   <mime-mapping>
      <extension>doc</extension>
      <mime-type>application/msword</mime-type>
   </mime-mapping>

   <mime-mapping>
      <extension>xls</extension>
      <mime-type>application/msexcel</mime-type>
   </mime-mapping>

   <mime-mapping>
      <extension>pdf</extension>
      <mime-type>application/pdf</mime-type>
   </mime-mapping>
</web-app>