war/src/main/java/pnews/servlet/Pnews.java

   1 package pnews.servlet;
   2
   3 import java.io.IOException;
   4 import java.io.UnsupportedEncodingException;
   5 import java.net.URLDecoder;
   6 import java.util.logging.Level;
   7 import java.util.logging.Logger;
   8
   9 import javax.servlet.ServletConfig;
  10 import javax.servlet.ServletException;
  11 import javax.servlet.http.HttpServlet;
  12 import javax.servlet.http.HttpServletRequest;
  13 import javax.servlet.http.HttpServletResponse;
  14
  15 public class Pnews extends HttpServlet {
  16         private static final Logger LOG = Logger.getLogger(Pnews.class.getName());
  17         private static final long serialVersionUID = 1L;
  18
  19         private static String getQueryParameter(HttpServletRequest rq, String key)
  20                         throws UnsupportedEncodingException {
  21                 String[] params;
  22                 int idx;
  23                 String q;
  24
  25                 q = rq.getQueryString();
  26
  27                 if (q == null)
  28                         return null;
  29
  30                 params = URLDecoder.decode(q, "UTF-8").split("&");
  31
  32                 for (String p: params) {
  33                         idx = p.indexOf('=');
  34
  35                         if (idx > 1 && p.substring(0, idx).equals(key))
  36                                 return p.substring(idx + 1);
  37                 }
  38
  39                 return null;
  40         }
  41
  42         private static void redirect(HttpServletRequest rq, HttpServletResponse rp) {
  43                 String redirectURL;
  44
  45                 try {
  46                         redirectURL = getQueryParameter(rq, "url");
  47
  48                         LOG.info("Request redirection to " + redirectURL);
  49
  50                         if (redirectURL != null) {
  51                                 rp.setHeader("Location", redirectURL);
  52                                 rp.setStatus(HttpServletResponse.SC_TEMPORARY_REDIRECT);
  53                         } else {
  54                                 rp.setStatus(HttpServletResponse.SC_NOT_FOUND);
  55                         }
  56
  57                 } catch (UnsupportedEncodingException e) {
  58                         e.printStackTrace();
  59                         LOG.log(Level.SEVERE, "redirect failure", e);
  60                         rp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
  61                 }
  62         }
  63
  64         @Override
  65         protected void  doGet(HttpServletRequest req, HttpServletResponse resp) {
  66                 String path;
  67
  68                 LOG.info("doGet " + req.getRequestURI());
  69
  70                 path = req.getPathInfo();
  71
  72                 if (path.equals("/redirect")) {
  73                         redirect(req, resp);
  74                 } else {
  75                         try {
  76                                 resp.getWriter().write("Not found " + req.getPathInfo());
  77                                 resp.setStatus(HttpServletResponse.SC_NOT_FOUND);
  78                         } catch (IOException e) {
  79                                 LOG.log(Level.SEVERE, "doGet failure", e);
  80                         }
  81                 }
  82         }
  83
  84         @Override
  85         public void init(ServletConfig config) throws ServletException {
  86                 LOG.info("Pnews servlet init " + config.getServletContext().getContextPath());
  87
  88         }
  89 }