we will write some code to use in any Jasper report report

first, create a procedure

create or replace PROCEDURE GET_REPORT (p_file_name VARCHAR2 ,p_file_type VARCHAR2 ,p_paramter_name VARCHAR2 ,p_paramter_value VARCHAR2 )
IS
  v_blob                 BLOB;
  v_file_name            VARCHAR2 (25) := p_file_name||'.'||p_file_type;
  v_vcContentDisposition VARCHAR2 (25)  := 'inline';

  v_hostname   VARCHAR2(30) := 'localhost'; -- your hostname, eg: localhost
  v_port       NUMBER       :=   '8081'; -- port for your JasperReports Server, eg: 8081
  v_username   VARCHAR2(50) := 'jasperadmin'; -- jasperreports server username 
  v_password   VARCHAR2(50) := 'jasperadmin'; -- jaspereports server password
  v_jasper_string VARCHAR2(30) := v_username || ';' || v_password;
   v_login_url  VARCHAR2(100) := 
    'http://' || v_hostname || ':' || v_port || '/jasperserver/rest/login';
  -- modify below URL before use!
  -- you should modify the line below; change /Pretius/ to your own name
  -- before you add a line try your URL in a web browser
  v_report_url VARCHAR2(100) := 
    'http://' || v_hostname || ':' || v_port || '/jasperserver/rest_v2/reports/reports/ALI/' || v_file_name;
BEGIN
  -- log into jasper server
  v_blob := apex_web_service.make_rest_request_b(
    p_url => v_login_url,
    p_http_method => 'GET',
    p_parm_name => apex_util.string_to_table('j_username;j_password',';'),
    p_parm_value => apex_util.string_to_table(v_jasper_string,';')
  );
  -- download file
  v_blob := apex_web_service.make_rest_request_b(
    p_url => v_report_url,
    p_http_method => 'GET',
    p_parm_name => apex_util.string_to_table(p_paramter_name,';'),
    p_parm_value => apex_util.string_to_table(p_paramter_value,';')
  );
  --OWA_UTIL.mime_header ('application/pdf', FALSE);  -- view your pdf file
  OWA_UTIL.MIME_HEADER( 'application/octet', FALSE ); -- download your pdf file
  HTP.p('Content-Length: ' || DBMS_LOB.GETLENGTH(v_blob));
  HTP.p('Content-Disposition: ' || v_vcContentDisposition ||'; filename="' || v_file_name || '"');
  OWA_UTIL.http_header_close;
  WPG_DOCLOAD.DOWNLOAD_FILE(v_blob);
  APEX_APPLICATION.STOP_APEX_ENGINE;
EXCEPTION
  WHEN OTHERS THEN
    RAISE;
END;

second, Create 4 Application Item

third, call your procedures

-- assign value for Application Item
:APP_FILE_NAME := 'EMPLOYEE' ;
:APP_FILE_TYPE := 'RTF' ;
:APP_PARM_NAME := 'P_EMPNO;P_DEPTNO' ;
:APP_PARM_VALUE := :P1_EMPNO||';'||:P1_DEPTNO ;
-- call GET_REPORT procedure
   GET_REPORT ( p_file_name => :APP_FILE_NAME ,
                p_file_type => :APP_FILE_TYPE ,
                p_paramter_name => :APP_PARM_NAME ,
                p_paramter_value => :APP_PARM_VALUE  ) ;

thanks