关于Apache实现多网站问题

我按照网上的方法复制/etc/apache2/sites-available/default 文件进行修改，但是好像还是访问的默认的default 的（www）目录，是不是哪里出错了呢，我的域名已经解析成功了，www 和 @都解析了，但是访问的时候还是默认的/var/www 文件夹下，那个命令a2ensite 我也运行了
<VirtualHost *:80>
        ServerAdmin lz@dmjd.cc
        ServerName dmjd.cc
        ServerAlias http://www.dmjd.cc

        DocumentRoot /home/website/dmjd.cc/public_html
        <Directory />
                Options FollowSymLinks
                AllowOverride None
        </Directory>
        <Directory /home/website/dmjd.cc/public_html/>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride None
                Order allow,deny
                allow from all
        </Directory>

        ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
        <Directory "/usr/lib/cgi-bin">
                AllowOverride None
                Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
                Order allow,deny
                Allow from all
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error.log

        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog ${APACHE_LOG_DIR}/access.log combined

    Alias /doc/ "/usr/share/doc/"
    <Directory "/usr/share/doc/">
        Options Indexes MultiViews FollowSymLinks
        AllowOverride None
        Order deny,allow
        Deny from all
        Allow from 127.0.0.0/255.0.0.0 ::1/128
    </Directory>

</VirtualHost>




有没有知道的帮忙看下