ajaxservlet.java

时尚数码平台登录模块 strut2+hibernate整合 四层架构 底层数据库层 DAO server层 表现层

package com.djj.server;
import com.djj.dao.impl.*;
import com.djj.model.User;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

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


public class AJAXServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		

	try{
		boolean flag = false;
		response.setContentType("text/html;charset=gb2312");
		PrintWriter out = response.getWriter();
		
		String name = request.getParameter("username");
		//String password = request.getParameter("password");
		//System.out.println("----------"+name);
		//System.out.println("----------"+password);
		
		if(name.length()==0 || name == null)
		{
			out.println("用户名不能为空");
		}else
		{
			UserDaoHibernate userDao = new UserDaoHibernate();
			Iterator<List> p = userDao.select();
			   
			   while(p.hasNext())
			   {
				   User u = (User)p.next();
				   if(name.equals(u.getUsername()))
				   {
					     out.println("用户名[" + name + "]已经存在,请使用其他用户");
					     flag = true;
				   }
			   }
			   if(!flag)
				   out.println("用户名[" + name + "]不存在,可以使用");
		}
		
	}catch(Exception e){
			e.printStackTrace();
		
	}
	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request,response);
	}
	
}