create or replace directory ddd  as 'C:\';
GRANT READ,WRITE ON DIRECTORY ddd TO scott;

conn scott/tiger;
DECLARE
 V_FILE UTL_FILE.FILE_TYPE;
 V_BUFFER VARCHAR2(32767);
BEGIN
  V_FILE:=UTL_FILE.FOPEN('DDD','test.txt','W',32767);
  V_BUFFER := 'hello!';
  UTL_FILE.PUT_LINE(V_FILE,V_BUFFER);
  UTL_FILE.FCLOSE(V_FILE);
END;
/