package servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import user.UserDao;

/**
 * Servlet implementation class AjaxServlet
 */

public class AjaxServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public AjaxServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		
		doPost(request, response);
		
		
		
	
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		request.setCharacterEncoding("utf-8");
		
		
		String username = request.getParameter("username");
		//System.out.println(username);
		
		UserDao dao=new UserDao();
		boolean b=dao.isExitsUserName(username);
	    //System.out.println(b);
	    if(b){
	    	response.getWriter().print("false");
	    }else{
	    	
	    	response.getWriter().print("true");
	    }
	
	}

}