checkservlet.java

ajax工程的小例子

/**
 * Created on Jul 12, 2007
 * By Maxwell C. Dong
 * 
 * Copyright 2006-2007 the original author or authors.
 */
package com.tarena.ajax.servlet;

import java.io.IOException;

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

/**
 * used to deal with form submit
 * 
 * @author maxwell conrad
 * 
 */
public class CheckServlet extends HttpServlet {

	public String[] userlist;

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		String username = (String) request.getParameter("username");

		String password = (String) request.getParameter("password");

		String repassword = (String) request.getParameter("repassword");

		String email = (String) request.getParameter("email");

		if (isContain(username)) {
			request.setAttribute("error.message", "The user name which you input has been in our system!");
			RequestDispatcher requestDispatcher = request	.getRequestDispatcher("error.jsp");
			requestDispatcher.forward(request, response);
		} else {
			RequestDispatcher requestDispatcher = request	.getRequestDispatcher("success.jsp");
			requestDispatcher.forward(request, response);
		}
	}

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request, response);
	}

	@Override
	public void init(ServletConfig config) throws ServletException {
		super.init(config);
		this.userlist = new String[] { "Tom", "Maxwell,", "Jerry", "Franks" };
	}

	public boolean isContain(String param) {
		for (int i = 0; i < userlist.length; i++) {
			if (userlist[i].equals(param)) {
				return true;
			} else
				continue;
		}

		return false;
	}

}