OracleXE ポート変更
http://download.oracle.com/docs/cd/B25329_01/doc/admin.102/b25107/network.htm#BHCDDAII
重要な部分を抜粋:
Changing the Listener Port Number for HTTP Connection Requests
For example, if you change the listener port number for HTTP requests to 8088.(http://127.0.0.1:8088/apexでアクセス)として
SQLPLUSで
CONNECT SYSTEM/password で接続して
EXEC DBMS_XDB.SETHTTPPORT(8088); を実行