changepswd.java

整个系统采用MVC开发模式

package lp;

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

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 bean.UserDAO;
import bean.User;

public class changepswd extends HttpServlet {

	/**
	 * 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 {

		response.setContentType("text/html; charset=gb2312");
		HttpSession session = request.getSession(true);
		String sql = "select * from user where username = '"
					+ session.getAttribute("username") + "'";
		   //从数据库中去出结果集
		UserDAO userdao = new UserDAO();
		
		String password =request.getParameter("password");
		String newpswd =request.getParameter("newpswd");
		String newpswd2 =request.getParameter("newpswd2");
		String message = null;
		
		try {
			ArrayList<User> result = userdao.userSelect(sql);
			User user = result.get(0);
			String realpswd = user.getPassword();
			if(!password.equals(realpswd)) message = "1";
			if(!newpswd.equals(newpswd2)) 
			{ 
				if (message != null) message ="12";
				else message = "2";
			}
			if(password.equals(realpswd) && newpswd.equals(newpswd2))
			{
				user.setPassword(newpswd);
				userdao.userUpdate(user);
				System.out.println("信息提交成功!!");
				message = "3";
			}	
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		response.sendRedirect("pswd_change.jsp?message=" + message);
	}

	/**
	 * 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 {

		doGet(request, response);
	}

}