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 HttpServlet { private static String htmlHead = ""; private static String htmlTail = ""; protected void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String path = request.getPathInfo(); path = path.substring(1); String[] parts = path.split("/"); if ( parts[0].equals("update") ) { updateWeatherDesc( request ); report( response ); } else if ( parts[0].equals("list") ) { report( response ); } } protected void doPost( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet( request, response); } private TreeMap weather = new TreeMap(); private synchronized void updateWeatherDesc( HttpServletRequest request ) { String location = request.getParameter("location" ); double temp = Double.NaN; try { String t = request.getParameter("temp" ); if ( t != null ) { temp = Double.parseDouble( t ); } } catch( Exception ex ) { } String synopsis = request.getParameter("synopsis" ); weather.put( location, new WeatherDesc(location,temp,synopsis) ); } 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 ); } }