Erro response.getOutputStream() / PDF

cell = new PdfPCell(new Paragraph(codTom, f08)); // codTom é String

cell.setHorizontalAlignment(cell.ALIGN_CENTER);

table.addCell(cell);

DataOutput output = new DataOutputStream(response.getOutputStream());

byte[] bytes = buffer.toByteArray();

response.setContentLength(bytes.length);

for( int i = 0; i < bytes.length; i++ ) { output.writeByte( bytes[i] ); }

private void downLoadTheExcelFile(String fileName, HttpServletResponse response) throws IOException 
	{ 
		try{
			FileInputStream inputStream = new FileInputStream(fileName); 
			boolean flag = true; 
			response.setHeader("Content-Disposition", "attachment;filename=ECOMatrix.xls"); 
			response.setContentType("application/vnd.ms-excel"); 
			char c = '\u5000'; 
			ServletOutputStream servletOutputStream = response.getOutputStream(); 
			BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(servletOutputStream); 
			int abyte0 = 0;
			int i = 0;
			while ((abyte0=inputStream.read()) != -1) 
			{ 
				bufferedOutputStream.write("teste \t".getBytes());
				i++;
				if(i%5 == 0)
					bufferedOutputStream.write("\n".getBytes());
				
				if(i%3 == 0)
					bufferedOutputStream.write("\t".getBytes());
			} 
			inputStream.close(); 
			bufferedOutputStream.flush(); 
		}catch(Exception e){}
	}

byte[] bytes = buffer.toByteArray();

response.setContentLength(bytes.length);

OuputStream out = response.getOutputStream();

out.write(bytes);

out.flush();
out.close();