import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; import java.io.BufferedReader; import java.util.Iterator; import java.util.List; import java.util.ArrayList; import java.util.TreeMap; import java.net.URLDecoder; import java.io.UnsupportedEncodingException; public class WeatherServlet extends QueryDecodeServlet { private static String htmlHead = ""; private static String htmlTail = ""; protected void processQuery( List list, HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { String path = request.getPathInfo(); path = path.substring(1); String[] parts = path.split("/"); if ( parts[0].equals("update") ) { update( list, request, response ); } else if ( parts[0].equals("list") ) { report( response ); } } private TreeMap weather = new TreeMap(); private synchronized void updateWeatherDesc( List list ) { String location = null; double temp = Double.NaN; String synopsis = null; Iterator it = list.iterator(); while ( it.hasNext() ) { QueryDecodeServlet.Pair p = it.next(); if ( p.name.equals( "location" ) ) { location = p.value; } else if ( p.name.equals( "temp" ) ) { temp = Double.parseDouble( p.value ); } else if ( p.name.equals( "synopsis" ) ) { synopsis = p.value; } } weather.put( location, new WeatherDesc(location,temp,synopsis) ); } private void update( List list, HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { updateWeatherDesc( list ); response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println( htmlHead ); out.println("

Thank you for your report.

"); out.println( htmlTail ); } private void report( HttpServletResponse response ) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println( htmlHead ); out.println(""); synchronized ( this ) { Iterator it = weather.values().iterator(); while ( it.hasNext() ) { WeatherDesc w = it.next(); out.print(""); out.print(""); out.print(""); out.print(""); out.print(""); } } out.println("

"+w.getLocation()+"

"+w.getTemperature()+"

"+w.getSynopsis()+"

"); out.println( htmlTail ); } }