salut,
j'ai une servlet qiu recupere un champ d'un formulaire
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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package metier;
 
public class Ftpchoice extends HttpServlet {
 
	private static final long serialVersionUID = 1L;
	protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
 
		response.setContentType("image/png");
		TimeSerie test = new .TimeSerie("");
		 String choix = request.getParameter("choix");
 
 
 JFreeChart imagechart;
try {
 
	imagechart = test.dessiner();
	 OutputStream out = response.getOutputStream(); 
	 ChartUtilities.writeChartAsPNG(out, imagechart, 700, 500);	
	 request.setAttribute("image",out);
	//request.getRequestDispatcher("Server1.jsp").forward(request, response);		 
 
} catch (SQLException e) {
	e.printStackTrace();
}
 
	}
 
	 protected void doGet(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException {
 processRequest(request, response);
}
	 protected void doPost(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException {
 processRequest(request, response);
}
 
	}
ainsi faire, la servlet marche sans probleme, sauf quand j'essaye de changer le code comme ceci :
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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public class Ftpchoice extends HttpServlet {
	/**
	 * 
	 */int i=0;
	private static final long serialVersionUID = 1L;
	protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
 
		response.setContentType("image/png");
		TimeSerie test = new TimeSerie("");
		 String choix = request.getParameter("choix");
 
 
JFreeChart imagechart;
if(choix=="date")
{
try {
 
	imagechart = test.dessiner();
	 OutputStream out = response.getOutputStream(); 
	 ChartUtilities.writeChartAsPNG(out, imagechart, 700, 500);	
	 request.setAttribute("image",out);
	//request.getRequestDispatcher("Server1.jsp").forward(request, response);		 
 
} catch (SQLException e) {
	e.printStackTrace();
}
 
	}
	}
 
	 protected void doGet(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException {
 processRequest(request, response);
}
	 protected void doPost(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException {
 processRequest(request, response);
}
 
	}
ca ne marche pas,