validationservlet.java

sourcode about java basic

/* Copyright 2005 Sun Microsystems, Inc. All rights reserved. You may not modify, use, reproduce, or distribute this software except in compliance with the terms of the License at: http://developer.sun.com/berkeley_license.html
$Id: ValidationServlet.java,v 1.2 2005/04/06 19:40:34 gmurray71 Exp $ */
package com.sun.j2ee.blueprints.bpcatalog.ajax;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

public class ValidationServlet extends HttpServlet {
    
    private ServletContext context;
    private HashMap accounts = new HashMap();
    
    // Initialize the "accounts" hashmap.  For the sake of this exercise,
    // two accounts are created with names "greg" and "duke" during
    // initialization of the Servlet.
    //
    public void init(ServletConfig config) throws ServletException {
        this.context = config.getServletContext();
        accounts.put("greg","account data");
        accounts.put("duke","account data");
    }
    
    public  void doGet(HttpServletRequest request, HttpServletResponse  response)
    throws IOException, ServletException {
        
        // Extract the data of the input form field whose name is "id"
        String targetId = request.getParameter("id");
        
        //  Send back either "<valid>true</valid>" or "<valid>false</valid>"
        //  XML message depending on the validity of the data that was entered.
        //  Note that the content type is "text/xml".
        //
        if ((targetId != null) && !accounts.containsKey(targetId.trim())) {
            response.setContentType("text/xml");
            response.setHeader("Cache-Control", "no-cache");
            response.getWriter().write("<valid>true</valid>");
        } else {
            response.setContentType("text/xml");
            response.setHeader("Cache-Control", "no-cache");
            response.getWriter().write("<valid>false</valid>");
        }
    }
    
    public  void doPost(HttpServletRequest request, HttpServletResponse  response)
    throws IOException, ServletException {
        
        String targetId = request.getParameter("id");
        if ((targetId != null) && !accounts.containsKey(targetId.trim())) {
            accounts.put(targetId.trim(), "account data");
            request.setAttribute("targetId", targetId);
            context.getRequestDispatcher("/success.jsp").forward(request, response);
        } else {
            context.getRequestDispatcher("/error.jsp").forward(request, response);
        }
    }
    
}