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

   1 package pnews.servlet;
   2
   3 import java.io.BufferedWriter;
   4 import java.io.FileWriter;
   5 import java.io.IOException;
   6 import java.io.Writer;
   7 import java.text.SimpleDateFormat;
   8 import java.util.Date;
   9 import java.util.Locale;
  10 import java.util.logging.Level;
  11 import java.util.logging.Logger;
  12
  13 import javax.servlet.http.HttpServletRequest;
  14
  15 public class RequesterLog {
  16         public static final RequesterLog singleton = new RequesterLog();
  17         private Writer writer;
  18         private Logger LOG = Logger.getLogger(RequesterLog.class.getName());
  19         private SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MMM/yyyy:HH:mm:ss Z", Locale.US);
  20
  21         public void writeRequest(HttpServletRequest rq) {
  22                 try {
  23                         synchronized(this) {
  24                                 if (writer == null)
  25                                         writer = new BufferedWriter(new FileWriter("access.log", true), 1024);
  26                         }
  27
  28                         synchronized (writer) {
  29                                 writer.write("[" + dateFormat.format(new Date()) + "] ");
  30                                 writer.write(rq.getRemoteAddr() + " " + rq.getRequestURI() + " " + rq.getQueryString());
  31                                 writer.write(" " + rq.getHeader("User-Agent"));
  32                                 writer.write("\n");
  33                                 writer.flush();
  34                         }
  35                 } catch (IOException e) {
  36                         LOG.log(Level.SEVERE, "Fails to log requester information", e);
  37                 }
  38         }
  39 }