Explication de code servlet

Version imprimable

bonjour
je suis debutant en J2EE et j'aimerais comprendre cette servlet si vous pouvez m'aider je vous en serais reconnaissant.

Code:

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public class ClientCtrl extends HttpServlet implements Constantes {
	private static final long serialVersionUID = 1L;
 
	public void doIt(HttpServletRequest req, HttpServletResponse resp)
			throws IOException {
		resp.setContentType(GetInHtml);
		try {
 
			String action = req.getParameter("_action");
			if (action.equals("0")) {
				listAll(req, resp);
				return;
			}
 
			if (action.equals("Edit")) {
				editClient(req, resp);
				return;
			}
 
 
			if (action.equals("Maj")) {
				doMaj(req, resp);
				return;
			}
 
		} catch (Exception e) {
			e.printStackTrace();
			resp.getWriter().write("Erreur:" + e.getMessage());
		}
 
	}
 
	private void listAll(HttpServletRequest req, HttpServletResponse resp)
			throws IOException {
		resp.setContentType(GetInHtml);
		try {
			ArrayList<Client> listeClt = new ArrayList<Client>();
			listeClt=ServiceFactory.getInstance().clientService.listAll();
			req.getSession().setAttribute("listeClt", listeClt);
			resp.sendRedirect(pageAPP + "Client.jsp");
			return;
 
		} catch (Exception e) {
			resp.getWriter().write("1//" + e.getMessage());
 
		}
	}
 
	private void editClient(HttpServletRequest req, HttpServletResponse resp)
			throws IOException {
		resp.setContentType(GetInHtml);
		try {
			Client clt=new Client();
             req.getSession().setAttribute("op", req.getParameter("op"));
             req.getSession().setAttribute("id", req.getParameter("id"));
             if(req.getParameter("op").equals("2")){
               	 clt=ServiceFactory.getInstance().clientService.getById(new Integer(req.getParameter("id")));
             }
             req.getSession().setAttribute("clt", clt);
			resp.sendRedirect(pageAPP + "ClientEdit.jsp");
			return;
 
		} catch (Exception e) {
			resp.getWriter().write("1//" + e.getMessage());
 
		}
	}
 
 
	private void doMaj(HttpServletRequest req, HttpServletResponse resp)
			throws IOException {
		resp.setContentType(GetInHtml);
		Client client = new Client();
		try {
			if ((req.getParameter("txtOp").equals("1"))
					|| (req.getParameter("txtOp").equals("2"))) {
 
				client.setLibelle(req.getParameter("txtLibelle"));
				client.setAdresse(req.getParameter("txtAdresse"));
 
				if (req.getParameter("txtOp").equals("1")) {
					ServiceFactory.getInstance().clientService.create(client);
				}
				if (req.getParameter("txtOp").equals("2")) {
					client.setId(new Integer(req.getParameter("txtId")));
					ServiceFactory.getInstance().clientService.update(client);
				}
 
			}
			// delete
			// -------------------------------------------------------------------------
			if (req.getParameter("txtOp").equals("3")) {
				ServiceFactory.getInstance().clientService.delete(req
						.getParameter("id"));
			}
			resp.sendRedirect(pageAPP + "Client.jsp");
 
		} catch (Exception e) {
			e.printStackTrace();
			resp.getWriter().write("1//" + e.getMessage());
		}
 
	}
 
	public void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws IOException
 
	{
		doIt(req, resp);
	}
 
	public void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws IOException
 
	{
		doIt(req, resp);
	}
}
   // FIN

j'en ai vraiment besoin merci;

Explication de code servlet

Re-Bonjour,
ta classe recupére le paramétre _action et selon la valeur de paramétre, O, edit, maj on se redirige vers des méthodes qui font : editer, lister la calsse Client.

Ta classe doit être posté comme ça :

Code:

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public class ClientCtrl extends HttpServlet implements Constantes {
private static final long serialVersionUID = 1L;
 
public void doIt(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType(GetInHtml);
try {
 
String action = req.getParameter("_action");
if (action.equals("0")) {
listAll(req, resp);
return;
}
 
if (action.equals("Edit")) {
editClient(req, resp);
return;
}
 
 
if (action.equals("Maj")) {
doMaj(req, resp);
return;
}
 
} catch (Exception e) {
e.printStackTrace();
resp.getWriter().write("Erreur:" + e.getMessage());
}
 
}
 
private void listAll(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType(GetInHtml);
try {
ArrayList<Client> listeClt = new ArrayList<Client>();
listeClt=ServiceFactory.getInstance().clientService.listAll();
req.getSession().setAttribute("listeClt", listeClt);
resp.sendRedirect(pageAPP + "Client.jsp");
return;
 
} catch (Exception e) {
resp.getWriter().write("1//" + e.getMessage());
 
}
}
 
private void editClient(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType(GetInHtml);
try {
Client clt=new Client();
req.getSession().setAttribute("op", req.getParameter("op"));
req.getSession().setAttribute("id", req.getParameter("id"));
if(req.getParameter("op").equals("2")){
clt=ServiceFactory.getInstance().clientService.getById(new Integer(req.getParameter("id")));
}
req.getSession().setAttribute("clt", clt);
resp.sendRedirect(pageAPP + "ClientEdit.jsp");
return;
 
} catch (Exception e) {
resp.getWriter().write("1//" + e.getMessage());
 
}
}
 
 
private void doMaj(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType(GetInHtml);
Client client = new Client();
try {
if ((req.getParameter("txtOp").equals("1"))
|| (req.getParameter("txtOp").equals("2"))) {
 
client.setLibelle(req.getParameter("txtLibelle"));
client.setAdresse(req.getParameter("txtAdresse"));
 
if (req.getParameter("txtOp").equals("1")) {
ServiceFactory.getInstance().clientService.create(client);
}
if (req.getParameter("txtOp").equals("2")) {
client.setId(new Integer(req.getParameter("txtId")));
ServiceFactory.getInstance().clientService.update(client);
}
 
}
// delete
// -------------------------------------------------------------------------
if (req.getParameter("txtOp").equals("3")) {
ServiceFactory.getInstance().clientService.delete(req
.getParameter("id"));
}
resp.sendRedirect(pageAPP + "Client.jsp");
 
} catch (Exception e) {
e.printStackTrace();
resp.getWriter().write("1//" + e.getMessage());
}
 
}
 
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException
 
{
doIt(req, resp);
}
 
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException
 
{
doIt(req, resp);
}
}
// FIN

17/11/2008, 16h00
abdel1025

explication du code servlet

merci beaucoup kmdkaci

ca marche maintenant merci beaucoup