import java.io.*;
public class AlbumServlet extends PhotoApplicationServlet
{
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException,
IOException
{
User user = getCurrentUser(request);
if (user == null)
{
response.sendRedirect(LOGIN_PAGE_URL);
return;
}
response.setContentType("text/html");
disableCache(response);
String albumName = request.getParameter("album");
PrintWriter out = response.getWriter();
if (albumName == null || albumName.equals(""))
{
// print error
out.println("");
out.println("");
out.println("");
out.println("Error");
out.println("");
out.println("");
out.print("Missing parameter: album");
out.print("
");
out.println("");
return;
}
Album album = loadAlbumByName(albumName);
if (album == null)
{
// print error
out.println("");
out.println("");
out.println("");
out.println("Error");
out.println("Could not load album '" + albumName + "'
");
out.println("");
return;
}
out.println("");
out.println("");
out.println("");
out.println("Album: " + album.getName() + "" );
out.println("");
out.println("");
out.println("Album: " + album.getName() + "
");
String pageParameter = request.getParameter("page");
int page;
if (pageParameter == null || pageParameter.equals(""))
{
page = 0;
}
else
{
page = Integer.parseInt(pageParameter);
}
out.println("");
int start = page * 20;
int end = start + 20;
end = Math.min(end, album.getPictures().size());
for (int i=start; i");
out.println("");
if (page > 0) {
out.print("<< previous ");
}
if (end < album.getPictures().size()) {
out.print(" next >>");
}
out.println("");
out.flush();
}
User getCurrentUser(HttpServletRequest request)
{
return (User)(request.getSession(true).getAttribute(CURRENT_USER_SESSION_ATTRIBUTE));
}
private void disableCache(HttpServletResponse response)
{
response.setHeader("Cache-Control", "no-cache"); //HTTP 1.1
response.setHeader("Pragma", "no-cache"); //HTTP 1.0
// prevents caching at the proxy server
response.setHeader("Expires", "Thu, 01 Jan 1970 00:00:00 GMT");
}
private void printPicture(PrintWriter out, Picture picture)
{
out.print("");
out.print("![](" + picture.getThumbnailImageSource() + ") ");
out.print("");
out.print(" | ");
out.print("");
out.print(picture.getCaption());
out.print(" | ");
out.println("
");
}
}