bonjour j'espere que ce que je te propose va t'aider vola un exemple comment afficher l'image de jfree chart dans une jsp et qui appele le resultat da la servlet Graphe:
la jsp:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Graphisme</title>
</head>
<body>
<H1>Exemple de graphique avec JFreeChart Essai1</h1>
<img src="Graphe"></img>
</body>
</html>
la servlet:
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
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.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
/**
* Servlet implementation class histo2
*/
public class Graphe extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Graphe() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
public void doGet(HttpServletRequest request,HttpServletResponse response)throws IOException,ServletException{
//response.setContentType("text/html");
//PrintWriter out=response.getWriter();
//out.println("<p>hello</p>");
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(120000.0, "aaa", "premier ");
dataset.addValue(550000.0, "aaa", "2 eme");
dataset.addValue(180000.0, "aa", "3eme e");
JFreeChart barChart = ChartFactory.createBarChart("Evolution des ventes", "","Unité vendue", dataset, PlotOrientation.VERTICAL, true, true, false);
ServletOutputStream out = response.getOutputStream();
response.setContentType("image/png");
ChartUtilities.writeChartAsPNG(out, barChart, 400, 300);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}