Metacat

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.InputStream;

import java.io.OutputStream;

import edu.ucsb.nceas.utilities.FileUtil;

	private static int DEFAULT_BUFFER_SIZE = 4 * 1024; // 4K buffer

			HttpServletResponse response, String destination) throws MetacatUtilException {

		try {

			logMetacat.debug("Redirecting response to " + request.getContextPath() + destination);

			response.sendRedirect(request.getContextPath() + destination);

		} catch (IOException ioe) {

			throw new MetacatUtilException("I/O error when redirecting response to: " + destination);

		}

	public static void writeFileToOutput(HttpServletResponse response, String fileDir, String fileName)

		throws MetacatUtilException {

		writeFileToOutput(response, fileDir, fileName, DEFAULT_BUFFER_SIZE);

	}

	public static void writeFileToOutput(HttpServletResponse response, String fileDir, String fileName, int bufferSize)

			throws MetacatUtilException {

		String filePath = "";

		try {

			filePath = fileDir + FileUtil.getFS() + fileName;

			int lastFileSep = fileName.lastIndexOf(FileUtil.getFS());

			String shortFileName = fileName.substring(lastFileSep + 1, fileName.length());

			response.setHeader("Content-Disposition", "attachment; filename=\"" + shortFileName + "\"");

			InputStream inputStream = new FileInputStream(filePath);

			OutputStream outputStream = response.getOutputStream();

			byte[] byteBuffer = new byte[bufferSize]; 

			int b = 0;

			while ((b = inputStream.read(byteBuffer)) != -1) {

				outputStream.write(byteBuffer, 0, b);

			}	

		} catch (FileNotFoundException fnfe) {

			throw new MetacatUtilException("Error finding file: " + filePath 

					+ " when writing to output");

		} catch (IOException ioe) {

			throw new MetacatUtilException("I/O Error when writing: " + filePath 

					+ "  to output");

		}

	}