login.java

这是一个网站在线订单系统.可以删除,查询,修改

package com.bsw.order.servlet;

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

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.bsw.order.database.*;
import com.bsw.order.base.*;

/**
 * @author 蜗牛 用来实现用户登录及用户order的显示
 * 
 */
public class Login extends HttpServlet {

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

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

	/**
	 * The doGet method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @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 doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request, response);
	}

	/**
	 * 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 {
		// 设置response和request的参数
		response.setContentType("text/html");
		response.setCharacterEncoding("utf-8");
		request.setCharacterEncoding("utf-8");

		// 从登录框里取出用户名字和密码
		
		String name = request.getParameter("name");
		String password = request.getParameter("password");

		// 定义session保存用户名字用于以后的查询
		javax.servlet.http.HttpSession session = request.getSession();
		session.setAttribute("buyer", name);

		// 创建User及其UserDAO用来进行数据库的操作
		User user = new User();
		user.setUser_name(name);
		user.setUser_password(password);
		userDAO ud = new userDAO();

		// 判断用户名与密码的正确性，如果正确，显示用户Order
		if (ud.userLogin(user)) {
			// 查询用户Order
			TorderDAO t = new TorderDAO();
			List l1 = t.queryUserOrders(name);
			request.setAttribute("list", l1);
			request.getRequestDispatcher("../com/bsw/order/jsp/viewOrder.jsp").forward(request, response);

		} else {
			response.sendRedirect("../com/bsw/order/jsp/error.jsp");

		}

	}

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

}