checkuser.java

这是一个购物车的源码

package com.tarena.shoppingcart.action;

import javax.servlet.http.*;

import java.io.*;

import javax.servlet.*;

import com.tarena.shoppingcart.dao.ShoppingCartHibernateImpl;

public class CheckUser extends HttpServlet {
  private static 	ShoppingCartHibernateImpl service = new ShoppingCartHibernateImpl();
	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request,response);
	}

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		String username = request.getParameter("name");
		String isValid="false";
		if(service.find(username)==null){
			isValid="true";
		}
		out.println(isValid);
		out.flush();
		out.close();
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		super.destroy();
	}

	@Override
	public void init() throws ServletException {
		// TODO Auto-generated method stub
		super.init();
	}
	
}