traininfoservice/banedk/DepartureServlet.java

package dk.thoerup.traininfoservice.banedk;

import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import dk.thoerup.traininfoservice.DBConnection;

/**
 * Servlet implementation class DepartureServlet
 */
public class DepartureServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;

        DepartureFetcher fetcher = new DepartureFetcher();
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
        

        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
                int station = Integer.parseInt( req.getParameter("station") );
                String format = req.getParameter("format");

                List<DepartureBean> beans;

                String stationName = getStationName(station);

                try {
                        beans = fetcher.lookupDepartures(station);
                } catch (Exception e) {
                        throw new ServletException(e);
                }
                
                resp.setDateHeader("Expires", 0);
                resp.setHeader("Cache-Control", "no-cache, must-revalidate");
                
                if (format.equalsIgnoreCase("xml")) {
                        resp.setContentType("text/xml");
                        resp.getWriter().print( formatXml(beans, stationName) );
                } else if (format.equalsIgnoreCase("html")) {
                        req.setAttribute("stationname", stationName );
                        req.setAttribute("departurebeans", beans);
                        req.setAttribute("stationID", station );
                        getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
                } else {
                        throw new ServletException("Unknown format");
                }

        }

        protected String formatXml(List<DepartureBean> beans, String stationName) throws ServletException{
                String xml = "";
                try {
                        DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
                        DOMImplementation impl = builder.getDOMImplementation();

                        
                        Document doc = impl.createDocument(null,null,null);
                Element root = doc.createElement("departureinfo");
                root.setAttribute("station", stationName);
                for (DepartureBean departure : beans) {
                        Element train = doc.createElement("train");
                        
                        Element time = doc.createElement("time");
                        time.setTextContent( departure.getTime() );
                        train.appendChild(time);
                        
                        Element updated = doc.createElement("updated");
                        updated.setTextContent( String.valueOf(departure.getUpdated()) );
                        train.appendChild(updated);
                        
                        Element trainNumber = doc.createElement("trainnumber");
                        trainNumber.setTextContent( departure.getTrainNumber() );
                        train.appendChild(trainNumber);
                        
                        Element destination = doc.createElement("destination");
                        destination.setTextContent( departure.getDestination());
                        train.appendChild(destination);
                        
                        Element origin = doc.createElement("origin");
                        origin.setTextContent( departure.getOrigin() );
                        train.appendChild(origin);
                        
                        Element location= doc.createElement("location");
                        location.setTextContent( departure.getLocation() );
                        train.appendChild(location);
                        
                        Element status = doc.createElement("status");
                        status.setTextContent( departure.getStatus() );
                        train.appendChild(status);
                        
                        Element note = doc.createElement("note");
                        note.setTextContent( departure.getNote() );
                        train.appendChild(note);
                        
                        root.appendChild(train);
                }
                
                doc.appendChild(root);
                
                
                DOMSource domSource = new DOMSource(doc);

                Transformer transformer = transformerFactory.newTransformer();
                //transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
                transformer.setOutputProperty(OutputKeys.METHOD, "xml");
                transformer.setOutputProperty(OutputKeys.ENCODING,"ISO-8859-1");
                transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
                transformer.setOutputProperty(OutputKeys.INDENT, "yes");
                java.io.StringWriter sw = new java.io.StringWriter();
                StreamResult sr = new StreamResult(sw);
                transformer.transform(domSource, sr);
                xml = sw.toString();


                } catch (Exception e) {
                        throw new ServletException(e);
                }
                return xml;
        }

        protected String getStationName(int stationID) {
                String station = "";

                Connection conn = null;
                try {
                        conn = DBConnection.getConnection();
                        Statement stmt = conn.createStatement();
                        ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID);
                        if (rs.next()) {
                                station = rs.getString(1);
                        }

                } catch (Exception e) { 
                } finally {
                        try {
                                if (conn != null && !conn.isClosed())
                                        conn.close();
                        } catch (Exception e) {}
                }

                return station;
        }

}
1	package dk.thoerup.traininfoservice.banedk;
2
3	import java.io.IOException;
4	import java.sql.Connection;
5	import java.sql.ResultSet;
6	import java.sql.Statement;
7	import java.util.List;
8
9	import javax.servlet.ServletException;
10	import javax.servlet.http.HttpServlet;
11	import javax.servlet.http.HttpServletRequest;
12	import javax.servlet.http.HttpServletResponse;
13	import javax.xml.parsers.DocumentBuilder;
14	import javax.xml.parsers.DocumentBuilderFactory;
15	import javax.xml.transform.OutputKeys;
16	import javax.xml.transform.Transformer;
17	import javax.xml.transform.TransformerFactory;
18	import javax.xml.transform.dom.DOMSource;
19	import javax.xml.transform.stream.StreamResult;
20
21	import org.w3c.dom.DOMImplementation;
22	import org.w3c.dom.Document;
23	import org.w3c.dom.Element;
24
25	import dk.thoerup.traininfoservice.DBConnection;
26
27	/**
28	* Servlet implementation class DepartureServlet
29	*/
30	public class DepartureServlet extends HttpServlet {
31	private static final long serialVersionUID = 1L;
32
33	DepartureFetcher fetcher = new DepartureFetcher();
34	TransformerFactory transformerFactory = TransformerFactory.newInstance();
35	DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
36
37
38	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
39	int station = Integer.parseInt( req.getParameter("station") );
40	String format = req.getParameter("format");
41
42	List<DepartureBean> beans;
43
44	String stationName = getStationName(station);
45
46	try {
47	beans = fetcher.lookupDepartures(station);
48	} catch (Exception e) {
49	throw new ServletException(e);
50	}
51
52	resp.setDateHeader("Expires", 0);
53	resp.setHeader("Cache-Control", "no-cache, must-revalidate");
54
55	if (format.equalsIgnoreCase("xml")) {
56	resp.setContentType("text/xml");
57	resp.getWriter().print( formatXml(beans, stationName) );
58	} else if (format.equalsIgnoreCase("html")) {
59	req.setAttribute("stationname", stationName );
60	req.setAttribute("departurebeans", beans);
61	req.setAttribute("stationID", station );
62	getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
63	} else {
64	throw new ServletException("Unknown format");
65	}
66
67	}
68
69	protected String formatXml(List<DepartureBean> beans, String stationName) throws ServletException{
70	String xml = "";
71	try {
72	DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
73	DOMImplementation impl = builder.getDOMImplementation();
74
75
76	Document doc = impl.createDocument(null,null,null);
77	Element root = doc.createElement("departureinfo");
78	root.setAttribute("station", stationName);
79	for (DepartureBean departure : beans) {
80	Element train = doc.createElement("train");
81
82	Element time = doc.createElement("time");
83	time.setTextContent( departure.getTime() );
84	train.appendChild(time);
85
86	Element updated = doc.createElement("updated");
87	updated.setTextContent( String.valueOf(departure.getUpdated()) );
88	train.appendChild(updated);
89
90	Element trainNumber = doc.createElement("trainnumber");
91	trainNumber.setTextContent( departure.getTrainNumber() );
92	train.appendChild(trainNumber);
93
94	Element destination = doc.createElement("destination");
95	destination.setTextContent( departure.getDestination());
96	train.appendChild(destination);
97
98	Element origin = doc.createElement("origin");
99	origin.setTextContent( departure.getOrigin() );
100	train.appendChild(origin);
101
102	Element location= doc.createElement("location");
103	location.setTextContent( departure.getLocation() );
104	train.appendChild(location);
105
106	Element status = doc.createElement("status");
107	status.setTextContent( departure.getStatus() );
108	train.appendChild(status);
109
110	Element note = doc.createElement("note");
111	note.setTextContent( departure.getNote() );
112	train.appendChild(note);
113
114	root.appendChild(train);
115	}
116
117	doc.appendChild(root);
118
119
120	DOMSource domSource = new DOMSource(doc);
121
122	Transformer transformer = transformerFactory.newTransformer();
123	//transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
124	transformer.setOutputProperty(OutputKeys.METHOD, "xml");
125	transformer.setOutputProperty(OutputKeys.ENCODING,"ISO-8859-1");
126	transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
127	transformer.setOutputProperty(OutputKeys.INDENT, "yes");
128	java.io.StringWriter sw = new java.io.StringWriter();
129	StreamResult sr = new StreamResult(sw);
130	transformer.transform(domSource, sr);
131	xml = sw.toString();
132
133
134	} catch (Exception e) {
135	throw new ServletException(e);
136	}
137	return xml;
138	}
139
140	protected String getStationName(int stationID) {
141	String station = "";
142
143	Connection conn = null;
144	try {
145	conn = DBConnection.getConnection();
146	Statement stmt = conn.createStatement();
147	ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID);
148	if (rs.next()) {
149	station = rs.getString(1);
150	}
151
152	} catch (Exception e) {
153	} finally {
154	try {
155	if (conn != null && !conn.isClosed())
156	conn.close();
157	} catch (Exception e) {}
158	}
159
160	return station;
161	}
162
163	}