測試了一下tomcat下配置虛擬目錄、多域名、多個Http監聽端口的配置方式，下面做一個conf/server.xml配置結果的記錄
< Listener className ="org.apache.catalina.core.AprLifecycleListener" SSLEngine ="on" />
< Listener className ="org.apache.catalina.core.JasperListener" />
< Listener className ="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
< Listener className ="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
< Listener className ="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
< 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 ="8088" protocol ="HTTP/1.1"
connectionTimeout ="20000"
redirectPort ="8443" />
< Connector port ="8009" protocol ="AJP/1.3" redirectPort ="8443" />
< Engine name ="Catalina" defaultHost ="localhost" >
< Realm className ="org.apache.catalina.realm.LockOutRealm" >
< Realm className ="org.apache.catalina.realm.UserDatabaseRealm"
resourceName ="UserDatabase" />
</ Realm >
< Host name ="localhost" appBase ="webapps"
unpackWARs ="true" autoDeploy ="true" >
< Alias >www.test3.com </ Alias >
< Valve className ="org.apache.catalina.valves.AccessLogValve" directory ="logs"
prefix ="localhost_access_log." suffix =".txt"
pattern ="%h %l %u %t "%r" %s %b" />
< Context path ="" docBase ="D:\TomCat7.0\testapp\TestWebliu" />
</ Host >
< Host name ="www.test1.com" appBase ="testapp"
unpackWARs ="true" autoDeploy ="true" >
</ Host >
</ Engine >
</ Service >
< Service name ="Catalina2" >
< Connector port ="880" protocol ="HTTP/1.1"
connectionTimeout ="20000"
redirectPort ="8443" />
< Connector port ="8010" protocol ="AJP/1.3" redirectPort ="8443" />
< Engine name ="Catalina2" defaultHost ="localhost" >
< Realm className ="org.apache.catalina.realm.LockOutRealm" >
< Realm className ="org.apache.catalina.realm.UserDatabaseRealm"
resourceName ="UserDatabase" />
</ Realm >
< Host name ="localhost" appBase ="webapps"
unpackWARs ="true" autoDeploy ="true" >
< Valve className ="org.apache.catalina.valves.AccessLogValve" directory ="logs"
prefix ="localhost_access_log." suffix =".txt"
pattern ="%h %l %u %t "%r" %s %b" />
< Context path ="" docBase ="D:\TomCat7.0\testapp\TestWebliu" />
</ Host >
< Host name ="www.test2.com" appBase ="testapp"
unpackWARs ="true" autoDeploy ="true" >
< Context path ="/TestWeb2" docBase ="D:\TomCat7.0\testapp\TestWeb2" />
< Context path ="" docBase ="D:\TomCat7.0\testapp\TestWebliu" />
</ Host >
</ Engine >
</ Service >
</ Server >
該server下面兩個service節點，每個service節點可以用Connector配置一個監聽端口，service里有只能有一個Engine節點，它接受同級目錄Connector端口的請求，可以通過defaultHost屬性默認指向一個Host，Host就是一個該Connector端口下的域名，下面可以用Context配置多個虛擬目錄。
即：server下面可以有多個service，用於配置不同監聽端口
service下面可以有多個Host，用於配置該端口下的不同域名
Host里可以包含多個Context，用於配置該端口該域名下的不同虛擬目錄
上面的配置，可以用下面鏈接訪問：
http://www.test1.com:8088/TestWeb2/
test1,2,3都是我hosts里指向了本地的。
Host下的Alias是一個域名別稱，可以配置多個域名。
Host里如果沒有Context節點，則非webapps文件夾下，直接不用虛擬目錄訪問，會拋404找不到文件的錯誤，比如上面配置中test1域名下必須用虛擬目錄比如這里的TestWeb2來訪問
Host下面的context節點配置為：<Context path="" 后，則這個目錄為默認的訪問目錄，比如http://www.test2.com:880/，訪問的D:\TomCat7.0\testapp\TestWebliu下面的文件。
這里因為我有默認首頁，因此直接輸入域名和端口可以直接訪問到默認的index.jsp頁面，如果沒有默認頁，可能會拋錯，需要配置可以/為列目錄，在conf/web.xml里
<init-param>
<param-name>listings</param-name>
<param-value>true</param-value>
</init-param>
把這個的param-value改為true即為可以列目錄了。
當然，如果不配置server.xml文件，直接把網站放到webapps，默認會自動加載該網站，因此大多數情況，我們都不用對server.xml文件做任何修改。