Tomcatconfweb.xml

<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>true</param-value>//这里本来是false改为true

    </init-param>

    <load-on-startup>1</load-on-startup>

</servlet>

//设置默认索引页

<welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

</welcome-file-list>

//设置错误页

项目目录/WEB-INFO/web.xml

<error-page>

    <error-code>400</error-code>

    <location>/lib/error.html</location>

    <error-code>500</error-code>

    <location>/lib/error.html</location>

</error-page>