[Forward / Redirect] Probléme

**wayle** · 09/08/2007, 11h04

Bonjour,

Je vourdrais faire un forward vers une page JSP. (Servlet) --> (JSP)
est - il possible ?

**kore62** · 09/08/2007, 11h05

ben oui
getServletContext().getRequestDispatcher("/page.jsp").forward(request, response);

**wayle** · 09/08/2007, 11h19

Dans ma Servlet LoginServlet, je test si le login de l'utilisateur est dans la BD. si ok je stock la session. sinon je forward vers la page login.jsp.

login.jsp

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>BD AGR</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
  <P>  &nbsp;</P><P></P><P align="center">
			<IMG src="../images/db_agr.jpg" alt="DB AGR" border="0" align="middle">
		</P><FORM name="FrmLogin" action="/LoginServlet" method="post">
			<P> 
			</P><TABLE border="0" align="center">
				<TR>
					<TD>
						<P align="left">
							login
						</P></TD>
					<TD>
						<INPUT type="text" name="login" maxlength="15">
					</TD>
				</TR>
				<TR>
					<TD>
						<P align="left">
							Mot de Passe
						</P></TD>
					<TD>
						<INPUT type="password" name="passwd" maxlength="10">
					</TD>
				</TR>
				<TR>
					<TD></TD>
					<TD>
						<P align="right">
							<INPUT type="submit" name="Valider" value="Valider" ></P>
					</TD>
				</TR>
			</TABLE><P></P>
			<P>
				 &nbsp;
			</P>
			<P>
				 &nbsp;
			</P>
			<P>
				 &nbsp;
			</P>
			</FORM>
  </body>
</html>

loginServlet.java

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package com.ge.health.em.agr.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;


import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;

import com.ge.health.em.agr.db.DBManager;

public class LoginServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;
	
	
	private static final Logger logger = Logger.getLogger(LoginServlet.class.getName());
	
	/**
	 * Constructor of the object.
	 */
	public LoginServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request,response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		
		String login = request.getParameter("login");
		String passwd = request.getParameter("passwd");
		
		
		
		
		DBManager db=null;
		Connection ct=null;
		Statement st=null;
		ResultSet rs=null;
		String query="";
		
		query = "select * from AGR_DEMANDEUR where NOM ='" + login +"'";
		try{
			db = DBManager.getInstance();
			ct = db.getConnection();
			st = ct.createStatement();
			rs = st.executeQuery(query);
			
			while (rs.next()) {
				HttpSession session = request.getSession(true);
			    session.setAttribute("login",login);             
				
				
			if  (!(login.equals (null)) && login.equals(rs.getString ("NOM")) && !(passwd.equals (null))){
			 
				System.out.println("ok");
				System.out.println(rs.getString ("NOM"));
			
				getServletContext().getRequestDispatcher("/jsp/index_main.jsp").forward(request, response);
				//String newURL = "/jsp/agr_consult/agr_search.jsp";
				//RequestDispatcher disp = request.getRequestDispatcher("/jsp/index_main.jsp");
				//disp.forward(request, response);
				System.out.println("ok forward"); 
				 
				}
				else if (!(login.equals(rs.getString ("NOM")) && !(passwd.equals(null)))) {
					System.out.println("ko");	
					getServletContext().getRequestDispatcher("/jsp/login.jsp").forward(request, response);
					//RequestDispatcher disp = request.getRequestDispatcher("/login.jsp");
					//disp.forward(request, response);
				    
				}
				else {
					out.println("Compte Inconnu !!");
				}

			}
			
		} catch (SQLException sqlEx){
			logger.error("SQLException in table Agr_Demandeur LOGIN() : " + sqlEx);
		} catch (Exception e){
			logger.error("Exception in table Agr_Demandeur LOGIN() : " + e);
		}finally{
			try {
				rs.close();
				rs = null;
				db.finalClose(st, ct);
			} catch (SQLException sqlEx) {
				logger.error("SQLException while closing ResultSet OR Connection in insertSQL() : " + sqlEx);
			}
		}
			
	
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}

web.xml

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<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<distributable/>
  <servlet>
    <servlet-name>DAG_Read</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.DAG_Read</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>User_Consult</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.User_Consult</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>Doc_Template</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.Doc_Template</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>Admin_Global</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.Admin_Global</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>DAG_FileTransfer</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.DAG_FileTransfer</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>Log4J_InitFromDB</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.Log4J_InitFromDB</servlet-class>
  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet>
    <servlet-name>DB_DuplicateAnAgr</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.DB_DuplicateAnAgr</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>DB_ModifyAnAgr</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.DB_ModifyAnAgr</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>DB_DeleteAnAgr</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.DB_DeleteAnAgr</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>DB_MoveAnAgr</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.DB_MoveAnAgr</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>DB_CreateAnAgr</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.DB_CreateAnAgr</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>Export_Oracle2Excel</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.Export_Oracle2Excel</servlet-class>
  </servlet>
  
  <servlet>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.ge.health.em.agr.servlet.LoginServlet</servlet-class>
  </servlet>






  <servlet-mapping>
	<servlet-name>DAG_Read</servlet-name>
	    <url-pattern>/DAG_Read</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
	<servlet-name>User_Consult</servlet-name>
	<url-pattern>/User_Consult</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Doc_Template</servlet-name>
    <url-pattern>/Doc_Template</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Admin_Global</servlet-name>
    <url-pattern>/Admin_Global</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>DAG_FileTransfer</servlet-name>
    <url-pattern>/DAG_FileTransfer</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Log4J_InitFromDB</servlet-name>
    <url-pattern>/Log4J_InitFromDB</url-pattern>
  </servlet-mapping>
    <servlet-mapping>
    <servlet-name>DB_DuplicateAnAgr</servlet-name>
    <url-pattern>/DB_DuplicateAnAgr</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>DB_ModifyAnAgr</servlet-name>
    <url-pattern>/DB_ModifyAnAgr</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
	<servlet-name>DB_DeleteAnAgr</servlet-name>
	<url-pattern>/DB_DeleteAnAgr</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>DB_MoveAnAgr</servlet-name>
    <url-pattern>/DB_MoveAnAgr</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>DB_CreateAnAgr</servlet-name>
    <url-pattern>/DB_CreateAnAgr</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Export_Oracle2Excel</servlet-name>
    <url-pattern>/Export_Oracle2Excel</url-pattern>
  </servlet-mapping>
  
  <servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/LoginServlet</url-pattern>
  </servlet-mapping>

  
  <welcome-file-list>
     <welcome-file>/jsp/login.jsp</welcome-file>
  </welcome-file-list></web-app>

d'où penses tu le probleme ??

En resultat:
j'ai une page blanche, avec l'URL de ma servlet ds le browser.
c'est bisar,

**kore62** · 09/08/2007, 11h26

pourquoi tu mets ton login en session et aprés tu testes s'il est bon..????
En plus ca doit plus tot être HttpSession session = request.getSession() ; et non pas HttpSession session = request.getSession(true) ;

ta mise en session je la ferait plutot une fois que je suis sur que le login est bon... nan? donc dans le if.. A moins que j 'ai mal compris ton code...

**wayle** · 09/08/2007, 11h33

oui, tout à fait, il faut tester d'abord et apres faire la mise en session.

Mais ce n'est pas normal de ne pas avoir ma page jsp aprés ?

**kore62** · 09/08/2007, 11h37

essaie juste de mettre "/index_main.jsp" dans ton request dispatcher...

Essaie de mettre plutot ton traitement dans la methode doGet()... Moi j'ai un code qui fait a peu pres le meme traitement et ca fonctionne... tiens voilà le code de la servlet si ca peut te servir:

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package maServlet;
import src.*;
 
 
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
 
import java.sql.*;
 
/**
 * Servlet implementation class for Servlet: VerifConnectionSVR
 *
 */
 public class VerifConnectionSVR extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
    /* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#HttpServlet()
	 */
	public VerifConnectionSVR() {
		super();
	}   	
 
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String identifiantCh = request.getParameter("identifiant"), motDePasseCh = request.getParameter("motDePasse");
		String pathBd,loginBd, pwdBd;
		boolean isPresent = false;
		pathBd = getServletContext().getInitParameter("baseDeDonnees");
		loginBd = getServletContext().getInitParameter("login");
		pwdBd = getServletContext().getInitParameter("pwd");
 
		try{
		  java.sql.Connection cnx = java.sql.DriverManager.getConnection(pathBd,loginBd,pwdBd);
	      java.sql.Statement requete = cnx.createStatement();
	      java.sql.ResultSet rs = requete.executeQuery("SELECT * FROM client");
	      //Parcours du résultat
	      int idClient=0;
	      Client monClient = new Client();
	      while((rs.next())&&(!isPresent))
	      {
	              //Login et mot de passe correspond a une entree dans la base de données
	              if((identifiantCh.equals(rs.getString("nom")))&&(motDePasseCh.equals(rs.getString("motDePasse")))){
	            	  idClient = rs.getInt("refClient");  
	            	  isPresent = true;
	                  monClient.chargeDepuisBase(rs);
	              }
	      }
	      //On ferme la connexion a la base...
	      rs.close();
	      requete.close();
	      cnx.close();
 
	      //Je met le client en session
	      HttpSession session = request.getSession() ;
	      session.setAttribute("leClient", monClient) ;
	      System.out.println(((Client)session.getAttribute("leClient")).getNom());
	      //Je renvoie vers le menu
	      if(isPresent)
	    	  getServletContext().getRequestDispatcher("/listeMenu.jsp").forward(request,response);
	      else
	    	  getServletContext().getRequestDispatcher("/index.jsp").forward(request, response);
 
		}catch(SQLException e)
		{
			//probleme de connexion a la base, on revient sur la page d'acceuil...
			 getServletContext().getRequestDispatcher("/index.jsp").forward(request, response);
		}
	}  	
 
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request,response);
	}   	  	    
}

fait pas gaffe a la gestion de la connexion c'est jste une servlet de test... C'est pas le must en codage niveau connexion..

[Forward / Redirect] Probléme

Servlets/JSP Java

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