在配置tomcat虚拟主机时候，如何每一个虚拟主机写成单独文件，server.xml包含这些子文件？ 如以下《OneinStack》中，添加JAVA环境虚拟主机后tomcat配置文件详情：

/usr/local/tomcat/conf/server.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE server-xml [

<!ENTITY localhost-vhost SYSTEM "file:///usr/local/tomcat/conf/vhost/localhost.xml">

<!ENTITY java.landui.com-vhost SYSTEM "file:///usr/local/tomcat/conf/vhost/java.landui.com.xml">

<!ENTITY demo.landui.com-vhost SYSTEM "file:///usr/local/tomcat/conf/vhost/demo.landui.com.xml">

]>

<Server port="8006" shutdown="SHUTDOWN">

  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/>

  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>

  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener"/>

  <Listener className="org.apache.catalina.core.AprLifecycleListener"/>

<!--

  <Listener className="org.apache.catalina.mbeans.JmxRemoteLifecycleListener" rmiRegistryPortPlatform="8081" rmiServerPortPlatform="8082" />

-->

  <GlobalNamingResources>

    <Resource name="UserDatabase" auth="Container"

              type="org.apache.catalina.UserDatabase"

              description="User database that can be updated and saved"

              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"

              pathname="conf/tomcat-users.xml" />

  </GlobalNamingResources>

  <Service name="Catalina">

    <Connector port="8080"

              protocol="org.apache.coyote.http11.Http11AprProtocol"

              connectionTimeout="20000"

              redirectPort="8443"

              maxThreads="1000"

              minSpareThreads="20"

              acceptCount="1000"

              debug="0"

              disableUploadTimeout="true"

              useBodyEncodingForURI="true"

              enableLookups="false"

              URIEncoding="UTF-8" />

    <Engine name="Catalina" defaultHost="localhost">

      <Realm className="org.apache.catalina.realm.LockOutRealm">

        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"

               resourceName="UserDatabase"/>

      </Realm>

      &localhost-vhost;

      &java.landui.com-vhost;

      &demo.landui.com-vhost;

    </Engine>

  </Service>

</Server>

注：在<server>元素前添加如下格式：

<!DOCTYPE server-xml [

  <!ENTITY localhost-vhost SYSTEM "file:///usr/local/tomcat/conf/vhost/localhost.xml">

]>

并在<Engine>...</Engine]引用它（localhost-vhost，注：不能以数字开头）即可。

下面是每个单独虚拟主机文件：

/usr/local/tomcat/conf/vhost/localhost.xml

<Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true">

  <Context path="" docBase="/data/wwwroot/default" debug="0" reloadable="true" crossContext="true"/>

  <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"

         prefix="localhost_access_log." suffix=".txt" pattern="%h %l %u %t &quot;%r&quot; %s %b" />

/usr/local/tomcat/conf/vhost/demo.landui.com.xml

<Host name="demo.landui.com" appBase="webapps" unpackWARs="true" autoDeploy="true">

  <Context path="" docBase="/data/wwwroot/demo.landui.com" debug="0" reloadable="true" crossContext="true"/>

  <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"

         prefix="demo.landui.com_access_log." suffix=".txt" pattern="%h %l %u %t &quot;%r&quot; %s %b" />

/usr/local/tomcat/conf/vhost/java.landui.com.xml

<Host name="java.landui.com" appBase="webapps" unpackWARs="true" autoDeploy="true"> <Alias>java1.landui.com</Alias>

  <Context path="" docBase="/data/wwwroot/java.landui.com" debug="0" reloadable="true" crossContext="true"/>

  <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"

         prefix="java.landui.com_access_log." suffix=".txt" pattern="%h %l %u %t &quot;%r&quot; %s %b" />

</Host>