带域名，ip，端口许多时候会无效，最好就是用*
此方法配置成功过，故写下来


LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_http_module modules/mod_proxy_http.so


NameVirtualHost *
<VirtualHost *>
ServerName www.a.com
DocumentRoot d:/AppServ/www/admin
</VirtualHost>
<VirtualHost *>
ServerName www.b.com
DocumentRoot d:/AppServ/www/calarm
</VirtualHost>
<VirtualHost *>
ServerName www.c.com
Options All
#DocumentRoot d:/
#d:/Program Files/Tomcat 5.5/webapps/ROOT
ProxyPass / ajp://127.0.0.1:8009/
ProxyPassReverse / ajp://127.0.0.1:8009/
</VirtualHost>