ExcelOutput.java

package com.idega.io;

/**
 * This example was written by Jason Clapham
 * for iText users who want a very simple example
 * of how to code a servlet to output a PDF document.
 */

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FilePermission;
import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.idega.core.file.util.MimeTypeUtil;

public class ExcelOutput extends HttpServlet {
	@Override
	public void init(ServletConfig config) throws ServletException {
		super.init(config);
	}

	@Override
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		FileInputStream fis = null;
		try {
			// take the message from the URL or create default message
			String spath = request.getParameter("dir");
			if (spath == null || spath.trim().length() <= 0) {
				spath = "[ specify a message in the 'msg' argument on the URL ]";
			}
			new FilePermission(spath, "read,execute");
			// create simple doc and write to a ByteArrayOutputStream
			ByteArrayOutputStream baos = new ByteArrayOutputStream();

			fis = new FileInputStream(spath);
			// Read the entire contents of the file.
			while (fis.available() > 0) {
				baos.write(fis.read());
			}

			// write ByteArrayOutputStream to the ServletOutputStream
			response.setContentType(MimeTypeUtil.MIME_TYPE_EXCEL_2);
			response.setContentLength(baos.size());
			ServletOutputStream out = response.getOutputStream();
			baos.writeTo(out);
			out.flush();

		}
		catch (Exception e2) {
			System.out.println("Error in " + getClass().getName() + "\n" + e2);
		}
		finally {
			if (fis != null) {
				fis.close();
			}
		}
	}

	@Override
	public void destroy() {
	}
}