centos6.3 tomcat apache 如何同一IP多域名配置?

之前进行同一ip多域名的Apache配置，因为有两个php工程，配置如下：

Listen 8080
NameVirtualHost *:80
<VirtualHost *:80>
 #   ServerAdmin webmaster@dummy-host.example.com
    DocumentRoot /var/www/html/gold/
    ServerName gmc.shapan-online.com
   # ErrorLog logs/dummy-host.example.com-error_log
   # CustomLog logs/dummy-host.example.com-access_log commo
HostNameLookups off
</VirtualHost>
 
NameVirtualHost *:80
<VirtualHost *:80>
 DocumentRoot /var/www/html/upload/
 ServerName forum.shapan-online.com
HostNameLookups off
</VirtualHost>

现在公司又突然让我加个javaweb，于是就就配置了tomcat了，然后修改了sever.xml文件

<Host name="www.shapan-online.com"  appBase="webapps"
            unpackWARs="true" autoDeploy="true"
            xmlValidation="false" xmlNamespaceAware="false">
 
        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->
 
        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>
        -->
        <Context docBase="sand" path=""  reloadable="true"/>
        </Host>

由于半路出家，原理不是很清楚，本以为，tomcat和Apache同时监听80端口，哪个url匹配到就让谁来执行工程呢，好像不是这样。
查了下资料，有几种说法，也不知道那种好，求配置过的JJGG来指导下，稍微带一点说明更好了。