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Execute Exec DBMS_XDB.SETHTTPPORT(8181); as SYS/SYSTEM. Replace 8181 with the port you'd like changing to. Tested this with Oracle 10g.
Exec DBMS_XDB.SETHTTPPORT(8181);
Source : http://hodentekhelp.blogspot.com/2008/08/my-oracle-10g-xe-is-on-port-8080-can-i.html