Change Oracle XE default HTTP and DB ports

• Stop listener in command window:

lsnrctl stop

• Modify ORACLE_HOME/app/oracle/product/10.2.0/server/NETWORK/ADMIN/listener.ora

LISTENER =
(DESCRIPTION_LIST =
 (DESCRIPTION =
   (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
   (ADDRESS = (PROTOCOL = TCP)(HOST = myhost)(PORT = 1521))
 )
)

Change the PORT to the number wanted. Also modify PORT in tnsnames.ora and save.

• Start listener:

lsnrctl start

• Run SQL Plus to add local listener for that port, then change HTTP listening port:

conn system/password;
alter system set local_listener = "(ADDRESS=(PROTOCOL=TCP)(HOST=your.com)(PORT=1522))";
exec dbms_xdb.sethttpport(nnnn);
alter system register;
disc;

If "set local_listener" is omitted, you probably will get get "ORA-12514: TNS:listener does not currently know of service requested when openning SQL Plus with sqlplus system@xe

alter system register" is also important as it reregisters the DB and all services with the listener. Otherwise you can find the port is not listening with netstat -an. Also you can verify with lsnrctl status, and a line like following should be there:
...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=your.com)(PORT=8090))(Presentation=HTTP)(Session=RAW))

• Confirm:

select dbms_xdb.gethttpport as "HTTP Port",
dbms_xdb.getftpport as "FTP Port" from dual;

Ref: http://download.oracle.com/docs/cd/B25329_01/doc/admin.102/b25107/network.htm#BHCCDEIH