Affichage d'un Jfreechart dans une JSP/Servlet
Bonjour, j'ai fait une classe qui se connecte a une base de donnée et qui affiche une courbe. Jusqu'au la tous fonctionne à merveille..
Sauf que lors de l'affichage dans une JSP, je me suis bloqué, j'ai crée une servlet et tt mais je ne sais pas comment 'afficher.
merci de me conseiller
voici ma classe qui trace la courbe
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package marouene;
import java.awt.Color;
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.Marker;
import org.jfree.chart.plot.ValueMarker;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StandardXYItemRenderer;
import org.jfree.chart.renderer.xy.XYItemRenderer;
//import org.jfree.data.time.Hour;
//import org.jfree.data.time.Minute;
import org.jfree.data.time.Minute;
//import org.jfree.data.time.RegularTimePeriod;
import org.jfree.data.time.Hour;
import org.jfree.data.time.Second;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import com.sun.org.apache.xpath.internal.operations.Minus;
public class TimeSeriesDemoTest extends ApplicationFrame {
private static final long serialVersionUID = 1L;
public TimeSeriesDemoTest(final String title) throws SQLException {
super(title);
String url = "jdbc:mysql://localhost:3306/newdata";
String username = "root";
String password = "root" ;
try{
Class.forName("com.mysql.jdbc.Driver");
}
catch (ClassNotFoundException e){
System.out.println("Pilote non retrouvé");
}
Statement stmt = null;
try {
Connection con = DriverManager.getConnection(url,username,password);
stmt = con.createStatement();
}
catch (SQLException sqle){System.out.println("Erreur de requete");}
ResultSet rs = (ResultSet) stmt.executeQuery("select heure,ftp from ftptable order by heure ;");
final TimeSeries series = new TimeSeries("Minute", Minute.class);
while(rs.next()){
Timestamp v1 = rs.getTimestamp("heure");
double v2=rs.getDouble("ftp");
series.addOrUpdate( new Second(v1), v2);
}
rs.close();
final TimeSeriesCollection dataset = new TimeSeriesCollection(series);
dataset.addSeries(series);
dataset.setDomainIsPointsInTime(true);
// create a title with Unicode characters (currency symbols in this case)...
final String chartTitle = "Evolution du transfert Ftp";
final JFreeChart chart = ChartFactory.createTimeSeriesChart(
chartTitle,
"Time",
"Débit en Ko/s",
dataset,
true,
true,
false
);
final XYPlot plot = chart.getXYPlot();
// plot.setInsets(new Insets(0, 0, 0, 20));
final Marker marker = new ValueMarker(0.0);
marker.setPaint(Color.blue);
marker.setAlpha(0.8f);
plot.addRangeMarker(marker);
plot.setBackgroundPaint(null);
final XYItemRenderer renderer = plot.getRenderer();
if (renderer instanceof StandardXYItemRenderer) {
final StandardXYItemRenderer r = (StandardXYItemRenderer) renderer;
//r.setPlotShapes(true);
r.setShapesFilled(true);
}
final ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new java.awt.Dimension(700, 400));
chartPanel.setMouseZoomable(true, false);
setContentPane(chartPanel);
}
public void tracer () throws SQLException {
final TimeSeriesDemoTest demo = new TimeSeriesDemoTest("Ftp ");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
} |
Servlet :je ne suis pas sur d'ailleurs quelle fonctionne a 100%
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package metier;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.data.time.Minute;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
public class tracage extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
/**
*
*/
private static final long serialVersionUID = 1L;
ServletOutputStream outb;
Connection connection;
Statement statmt;
ResultSet rs;
String url = "jdbc:mysql://localhost:3306/newdata;";
String username = "root";
String password = "root" ;
String driver ="com.mysql.jdbc.Driver";
//Initialiser les variables globales
public void init() throws ServletException {
try{
Class.forName(driver);
}
catch (ClassNotFoundException e){
System.out.println("Pilote non retrouvé");
}
try{
connection = DriverManager.getConnection(url,username,password);
}
catch(SQLException sqle){System.out.println("Erreur lors de la connexion à la base de données");
destroy();}
}
//Traiter la requête HTTP Get
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
outb = res.getOutputStream();
String requete = "select heure,ftp from ftptable order by heure ;";
final TimeSeries series = new TimeSeries("Minute", Minute.class);
try {
statmt = connection.createStatement();
rs = statmt.executeQuery(requete);
while(rs.next()){
Timestamp v1 = rs.getTimestamp("heure");
double v2=rs.getDouble("ftp");
series.addOrUpdate( new Minute(v1), v2);
}
rs.close();
}
catch (SQLException sqle){System.out.println("Erreur de requete");}
final TimeSeriesCollection dataset = new TimeSeriesCollection(series);
dataset.addSeries(series);
final String chartTitle = "Evolution du transfert Ftp";
final JFreeChart chart = ChartFactory.createTimeSeriesChart(
chartTitle,
"Time",
"Débit en Ko/s",
dataset,
true,
true,
false
);
OutputStream out = res.getOutputStream();
res.setContentType("image/png");
ChartUtilities.writeChartAsPNG(out, chart, 600, 500);
}
//Nettoyer les ressources
public void destroy() {
try {
connection.close();
}
catch (SQLException sqle){System.out.println("Erreur de fermeture de connexion à la base de données");}
}
} |
Partie JSP pour l'affichage
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<div class="entry">
<img src="metier/tracage"/>
</div> |
