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Another servlet to Send PDF

import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class SendPdf extends HttpServlet {   public void doGet(HttpServletRequest request, HttpServletResponse response)       throws ServletException, IOException {     //get the 'file' parameter     String fileName = (String) request.getParameter("file");     if (fileName == null || fileName.equals(""))       throw new ServletException(           "Invalid or non-existent file parameter in SendPdf servlet.");     // add the .pdf suffix if it doesn't already exist     if (fileName.indexOf(".pdf") == -1)       fileName = fileName + ".pdf";     String pdfDir = getServletContext().getInitParameter("pdf-dir");     if (pdfDir == null || pdfDir.equals(""))       throw new ServletException(           "Invalid or non-existent 'pdf-Dir' context-param.");     ServletOutputStream stream = null;     BufferedInputStream buf = null;     try {       stream = response.getOutputStream();       File pdf = new File(pdfDir + "/" + fileName);       response.setContentType("application/pdf");       response.addHeader("Content-Disposition", "attachment; filename="           + fileName);       response.setContentLength((int) pdf.length());       FileInputStream input = new FileInputStream(pdf);       buf = new BufferedInputStream(input);       int readBytes = 0;       while ((readBytes = buf.read()) != -1)         stream.write(readBytes);     } catch (IOException ioe) {       throw new ServletException(ioe.getMessage());     } finally {       if (stream != null)         stream.close();       if (buf != null)         buf.close();     }   }   public void doPost(HttpServletRequest request, HttpServletResponse response)       throws ServletException, IOException {     doGet(request, response);   } }