nginx的配置,要求根据不同的来路域名，发送到不同的端口去处理

这一台电脑上既有tomcat 也有 apache,他俩是没有办法同时享用80端口的。我现在让tomcat用8088,apache用8080,然后让nginx用80,这样nginx在收到请求后，根据不同的域名转到8088或8080去处理。 如 http://www.abc.com 转到8088,http://bbs.abc.com转到8080，该如何写nginx的配置文件。跪求，在线等。

http {
	   upstream www
	   {
		  server xxx.xxx.xxx.xxx:8088 max_fails=3 fail_timeout=30s;
	   }
          upstream bbs
           {
                server xxx.xxx.xxx.xxx:8080 max_fails=3 fail_timeout=30s;
          }

	server {
		listen 		80;
		server_name	www.abc.com;
		location / {
			index	index.html index.php index.jsp index.htm;
			proxy_pass 		http://www;
			proxy_redirect		off;
			proxy_set_header	Host	$host;
			proxy_set_header	X-Real-IP	$remote_addr;
			proxy_set_header	X-Forwarded-For	$proxy_add_x_forwarded_for;
 			#proxy_connect_timeout	90;
			#proxy_send_timeout	90;
			#proxy_read_timeout	90;
			#proxy_buffers		32 4K;
		}
				 log_format   '$remote_addr - $remote_user [$time_local] $request '
                                '"$status" $body_bytes_sent "$http_referer" '
                                '"$http_user_agent" "$http_x_forwarded_for"'
				'"$server_addr;" "$upstream_addr "';

	}
           server {
                listen          80;
                server_name    bbs.abc.com ;
                location / {
                        index   index.html index.php index.jsp index.htm;
                        proxy_pass              http://bbs;
                        proxy_redirect          off;
                        proxy_set_header        Host    $host;
                        proxy_set_header        X-Real-IP       $remote_addr;
                        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
                        #proxy_connect_timeout  90;
                        #proxy_send_timeout     90;
                        #proxy_read_timeout     90;
                        #proxy_buffers          32 4K;
                }
        }

}#end  of http