checkpwd.java

这是我自己做的一个选课系统

package org.chooseClass.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;

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

import org.chooseClass.database.DBConnect;
import org.hibernate.dao.LoginDAO;
import org.hibernate.dao.StudentDAO;
import org.hibernate.dao.TeacherDAO;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import org.struts2.util.Constants;

public class CheckPwd extends HttpServlet {

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

	/**
	 * 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 {

		this.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 {

		response.setContentType("text/xml");
		PrintWriter out = response.getWriter();
		String old_pwd = request.getParameter("old_pwd");
		String role = (String)request.getSession().getAttribute(Constants.USERNAME_ROLE);
		
		String user_id = (String)request.getSession().getAttribute(Constants.USERNAME_KEY);
		boolean isValid = false;
		
		WebApplicationContext wac=WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());
		
		try {
			if(role.equals("student")){
				StudentDAO studentDAO = (StudentDAO) wac.getBean("studentDAO");
			    isValid = studentDAO.isValid(user_id, old_pwd);
			}else
			if(role.equals("teacher")){
				TeacherDAO teacherDAO = (TeacherDAO) wac.getBean("teacherDAO");
			    isValid = teacherDAO.isValid(user_id, old_pwd);
			}else
			if(role.equals("admin")){
				LoginDAO loginDAO = (LoginDAO) wac.getBean("loginDAO");
			    isValid = loginDAO.isValid(user_id, old_pwd);
			}
			
			if(isValid){
				out.print("密码正确！请继续输入新密码！");
			}
			else{
				out.print("密码错误！请重新输入密码！");
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}