Aligning the dynamicjasper report in html and pdf
===

I am using jasper reports to export my report to a pdf,excel and html formats. I am using spring MVC and running it under Tomcat 7. I have used exporter class for all those three.And had set parameters for it. My code is like. 

    public static void exportToXls(JasperPrint jasperPrint, 
    			ByteArrayOutputStream baos) throws JRException
    	{
    		JRXlsExporter exporter = new JRXlsExporter();
    				
    		exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);
    	exporter.setParameter(JRXlsAbstractExporterParameter.IS_ONE_PAGE_PER_SHEET, Boolean.FALSE);
            exporter.setParameter(JRXlsAbstractExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS, Boolean.TRUE);
            exporter.setParameter(JRXlsAbstractExporterParameter.IS_WHITE_PAGE_BACKGROUND, Boolean.FALSE);
            exporter.setParameter(JRXlsAbstractExporterParameter.IS_DETECT_CELL_TYPE, Boolean.TRUE);
    		        
           exporter.exportReport();
    	}
    	
    	public static void exportToPdf(JasperPrint jasperPrint, ByteArrayOutputStream baos) throws JRException
    	{
    		JRPdfExporter exporter = new JRPdfExporter();
    		
    		exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);
            
            exporter.setParameter(JRPdfExporterParameter.IS_TAGGED, Boolean.TRUE);
            exporter.exportReport();
    	}
    	
    	public static void exportToHtml(JasperPrint jasperPrint, ByteArrayOutputStream baos) throws JRException
    	{
    		JRHtmlExporter exporter = new JRHtmlExporter();
    		
    		exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);
            exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN,true);
            
            exporter.exportReport();
    	}
    }

The data is displaying all the formats. In excel format, its working fine.I have  few questions.

 1. when i check with the pdf format, the page crops with the data. ie. the page height is taken only for the data needed. can i make it full page(for eg A4 size). I need the data to be shown in full page always

2.And in the html,the view is shown center aligned. I need to show it in full page view.ie to show report stretched means of width.