loginaction.java

学生成绩管理系统

package com.stuman.web.struts.action;

import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

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

import org.apache.commons.beanutils.BeanUtilsBean;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.validator.DynaValidatorForm;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;

import com.stuman.dao.hibernate.HibernateUtil;
import com.stuman.domain.Admin;
import com.stuman.domain.Student;
import com.stuman.domain.Teacher;
import com.stuman.web.struts.form.LoginForm;

public class LoginAction extends Action {
	private BeanUtilsBean beanUtilsBean;

	public LoginAction() {
		this.beanUtilsBean = new BeanUtilsBean();
	}

	 

	/**
	 * Method execute
	 * 
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 * @throws UnsupportedEncodingException
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws UnsupportedEncodingException {

		// TODO Auto-generated method stub

		HttpSession session = request.getSession();
		Session s = HibernateUtil.currentSession();
		LoginForm loginForm = new LoginForm();
		DynaValidatorForm dform = (DynaValidatorForm) form;
		try {
			this.getBeanUtilsBean().copyProperties(loginForm, dform);
		} catch (IllegalAccessException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (InvocationTargetException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}

		// 声明字符串型变量sort，并调用loginForm的getSort函数取得类型为其赋值
		String sort = loginForm.getSort();
		// 声明字符串型变量username，并调用loginForm的getUsername函数取得用户名为其赋值
		String username = loginForm.getUsername();
		// 声明字符串型变量password，并调用loginForm的getPassword函数取得密码为其赋值
		String password = loginForm.getPassword();
		// 声明整型变量loginSort，将上面的字符串类型变量sort表示的数字转换成整型为其赋值
		int loginSort = Integer.parseInt(sort);
		// 声明字符串类型数组userlist
		String[] userlist = new String[2];
		// 分别将刚刚取得的用户名和密码存入到userlist中

		userlist[0] = username;
		userlist[1] = password;
		List list = new ArrayList();
		try {
			// 开始事务
			HibernateUtil.beginTransaction();
			String str = new String();
			// 使用程序结构控制语句swicth，根据loginSort的值进入不同的分支
			switch (loginSort) {
			// 类型1为学生用户
			case 1:
				str = " from Student as stu where stu.name=:stuName and stu.password=:stuPassword";
				Query query = s.createQuery(str);
				// System.out.println(username + " " + password);
				// 调用其setString方法，并为str中的stuName，stuPassword赋值为username
				// 和password
				query.setString("stuName", username);
				query.setString("stuPassword", password);
				// 调用query对象的list函数执行查询，
				list = query.list();

				if (list.size() > 0) {
					// 如果结果大于0，表示找到该用户名，关闭Session对象s
					request.getSession().setAttribute("stuid",
							((Student) list.get(0)).getId());
					request.getSession().setAttribute("deptment",
							((Student) list.get(0)).getDepartment());
					s.close();
					// 页面跳转
					return mapping.findForward("studentLoginsuccess");
				} else
					// 否则表示该用户不存在
					break;
			case 2:
				str = " from Teacher tea where tea.name =? and tea.password ='"
						+ password + "'";

				Query query2 = s.createQuery(str);
				// System.out.println(username + " " + password);
				query2.setString(0, username);
				list = query2.list();
				if (list.size() > 0) {
					request.getSession().setAttribute("teaid",
							((Teacher) list.get(0)).getId());
					request.getSession().setAttribute("teacherId",
							((Teacher) list.get(0)).getId());
					s.close();
					return mapping.findForward("teacherLoginsuccess");
				} else
					break;
			case 3:
				str = " from Admin admin where admin.name = ? and admin.password ='"
						+ password + "'";
				// System.out.println(username + " " + password);
				Query query3 = s.createQuery(str);
				query3.setString(0, username);
				list = query3.list();
				if (list.size() > 0) {
					request.getSession().setAttribute("id",
							((Admin) list.get(0)).getId());
					s.close();
					return mapping.findForward("adminLoginsuccess");
				} else
					break;
			default:
				break;
			}
		} catch (HibernateException e) {
			// 如果有异常，打印出异常结果
			e.printStackTrace();
		} finally {
			s.close();
		}
		// 创建ActionMessages类的对象errors，用来保存错误信息
		ActionMessages errors = new ActionMessages();
		errors.add("login error", new ActionMessage("login.error"));
		saveErrors(request, errors);
		return mapping.getInputForward();

	}

	public BeanUtilsBean getBeanUtilsBean() {
		return beanUtilsBean;
	}
}