Mercurial > hg > STI-GWT

annotate src/econnect/wp3_3/server/ExportServlet.java @ 40:20eb7596d466 CellTable

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Preparation for a switch to a CellTable. This is work in progress.
author Sebastian Kruse <skruse@mpiwg-berlin.mpg.de>
date Thu, 06 Dec 2012 18:05:39 +0100
parents 175c1eecaf84
children
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1 package econnect.wp3_3.server;
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2
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3 import java.io.File;
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4 import java.io.FileInputStream;
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5 import java.io.FileNotFoundException;
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6 import java.io.IOException;
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7 import java.io.OutputStream;
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8
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9 import javax.servlet.ServletException;
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10 import javax.servlet.http.HttpServlet;
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11 import javax.servlet.http.HttpServletRequest;
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12 import javax.servlet.http.HttpServletResponse;
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13
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14 public class ExportServlet extends HttpServlet {
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16 private void streamFileTo(HttpServletResponse response, File file)
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17 throws IOException, FileNotFoundException {
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18 response.setBufferSize(32768);
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19 int bufSize = response.getBufferSize();
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21 OutputStream os = response.getOutputStream();
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22 FileInputStream fis = new FileInputStream(file);
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23 byte[] buffer = new byte[bufSize];
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24 int bytesRead = 0;
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25 while ((bytesRead = fis.read(buffer)) > 0) {
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26 os.write(buffer, 0, bytesRead);
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27 }
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28 os.flush();
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29 fis.close();
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30 }
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32 private void prepareResponseFor(HttpServletResponse response, File file) {
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33 StringBuilder type = new StringBuilder("attachment; filename=");
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34 type.append(file.getName());
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35 response.setContentLength((int) file.length());
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36 response.setContentType("application/octet-stream");
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37 response.setHeader("Content-Disposition", type.toString());
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38 }
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39
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40 public void doGet(HttpServletRequest request, HttpServletResponse response)
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41 throws ServletException {
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42
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43 OutputStream out = null;
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44 File exportedFile = null;
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45 try {
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46 String fileName = request.getParameter("ExportedFilename");
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47 exportedFile = new File("kmlexport/" + fileName);
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48
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49 prepareResponseFor(response, exportedFile);
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50 streamFileTo(response, exportedFile);
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51
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52 } catch (Exception e) {
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53 throw new ServletException("Exception in Export Servlet", e);
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54 } finally {
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55 if (out != null) {
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56 try {out.close();} catch(Exception e){}
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57 }
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58
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59 if (exportedFile != null) {
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60 exportedFile.delete();
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61 }
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63 }
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64 }
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65 }