loginservlet.java

一个仿造淘宝的jsp网站。功能比较完善

package com.jc.taobao.gjj.action;

import java.io.IOException;
import java.io.PrintWriter;

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

import com.jc.taobao.gjj.entity.UserInfo;
import com.jc.taobao.gjj.logic.UserInfoBean;

public class LoginServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public LoginServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doPost method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		String username = request.getParameter("usercardid");
		String userpwd = request.getParameter("userpassword");
		UserInfoBean userbean = new UserInfoBean();
		UserInfo user = new UserInfo();
		user.setUsername(username);
		user.setUserpwd(userpwd);
		int isuser=userbean.getLogin(user);
		HttpSession session=request.getSession();
		if(isuser<0)
		{
			out.print("<script>alert('用户名或密码错误！');window.history.go(-1);</script>");
		}else
		{
			session.setAttribute("loginusername", username);
			System.out.println(request.getPathInfo());
			out.print("<script>window.history.go(-2);window.history.go(0);</script>");
		}
	}

	/**
	 * Initialization of the servlet. <br>
	 * 
	 * @throws ServletException
	 *             if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}