studentaction.java

java网上考试系统

package com.qrsx.exam.struts.action;

import java.io.IOException;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.qrsx.exam.dao.ClassesDAO;
import com.qrsx.exam.dao.DAOFactory;
import com.qrsx.exam.dao.StudentDAO;
import com.qrsx.exam.dao.UserDAO;
import com.qrsx.exam.model.Classes;
import com.qrsx.exam.model.Student;
import com.qrsx.exam.model.User;
import com.qrsx.exam.struts.BaseAction;
import com.qrsx.exam.struts.form.StudentForm;
import com.qrsx.exam.util.BeanUtils;

/**
 * The action about student
 * 
 * @struts.action name="studentForm" path="/manage/student" scope="request"
 *                input="/manage/student_add.jsp" validate="false" parameter="p"
 * 
 * @struts.action-forward name="add" path="/manage/student_add.jsp"
 * 
 * @struts.action-forward name="update" path="/manage/student_update.jsp"
 * 
 * @struts.action-forward name="list" path="/manage/student_list.jsp"
 * 
 * @author galaxy
 * 
 */
public class StudentAction extends BaseAction {
    /**
     * 获得班级学生的方法
     */
    public ActionForward list(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        // 得到班级的ID值
        String classesid = request.getParameter("classesid");

        // 得到班级DAO对象
        ClassesDAO dao = DAOFactory.getDao(ClassesDAO.class);
        // 得到班级信息
        Classes c = dao.findById(classesid, false);

        // 将班级信息设置为请求的属性
        request.setAttribute("classes", c);

        // 跳转到学生信息列表页面
        return mapping.findForward("list");
    }

    /**
     * 进入录入学生信息页面
     */
    public ActionForward addin(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        // 得到班级的ID值
        String classesid = request.getParameter("classesid");

        // 得到班级信息
        ClassesDAO dao = DAOFactory.getDao(ClassesDAO.class);
        Classes c = dao.findById(classesid, false);
        request.setAttribute("classes", c);

        // 跳转到录入学生信息页面
        return mapping.findForward("add");
    }

    /**
     * 保存学生信息
     */
    public ActionForward save(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        // 得到学生对象
        Student s = BeanUtils.copyProperties(new Student(), form);

        // 得到UserDAO对象的实例
        UserDAO dao = DAOFactory.getDao(UserDAO.class);
        // 判断用户名是否存在
        if (dao.getUserByName(s.getName()) == null) {
            // 得到班级的ID
            String classesid = request.getParameter("classesid");

            // 得到班级对象
            ClassesDAO classesdao = DAOFactory.getDao(ClassesDAO.class);
            Classes c = classesdao.findById(classesid, false);

            // 保存学生对象
            s.setClasses(c);
            dao.makePersistent(s);

            // 设置提示信息
            addMessage(request, "student.msg.add.success");

            // 清空Form中的值
            StudentForm student = (StudentForm) form;
            student.setName(null);
            student.setPassword(null);
            student.setFullname(null);
        } else {
            addMessage(request, "student.msg.add.nameexist");
        }

        // 返回到学生信息录入页面
        return addin(mapping, form, request, response);
    }

    /**
     * 进入学生信息修改页面的Action方法
     */
    public ActionForward updatein(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        // 得到用户传递的参数
        StudentForm student = (StudentForm) form;

        // 得到StudentDAO对象的实例
        StudentDAO dao = DAOFactory.getDao(StudentDAO.class);
        // 得到学生对象
        Student s = dao.findById(student.getId(), false);
        request.setAttribute("studentForm", s);
        request.setAttribute("classes", s.getClasses());

        // 跳转到学生信息修改页面
        return mapping.findForward("update");
    }

    /**
     * 保存学生信息
     */
    public ActionForward update(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        // 得到学生对象
        Student s = BeanUtils.copyProperties(new Student(), form);

        // 得到UserDAO对象的实例
        UserDAO dao = DAOFactory.getDao(UserDAO.class);
        User u = dao.getUserByName(s.getName());
        // 判断用户名是否存在
        if (u == null || u.getId().equals(s.getId())) {
            if (u == null)
                u = dao.findById(s.getId(), false);

            if (u != null) {
                Student stu = (Student) u;
                stu.setName(s.getName());
                stu.setPassword(s.getPassword());
                stu.setFullname(s.getFullname());

                // 设置提示信息
                addMessage(request, "student.msg.update.success");
            } else {
                // 设置提示信息
                addMessage(request, "student.msg.update.notexist");
            }
        } else {
            // 设置用户名重复提示信息
            addMessage(request, "student.msg.add.nameexist");
            if (s.getId() != null && s.getId().length() > 0) {
                // 返回学生信息修改页面
                return updatein(mapping, form, request, response);
            }
        }

        // 返回到学生信息列表页面
        return list(mapping, form, request, response);
    }

    /**
     * 删除学生信息功能
     */
    public ActionForward delete(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        // 得到用户传递的参数
        StudentForm student = (StudentForm) form;

        // 得到要删除的学生对象
        StudentDAO dao = DAOFactory.getDao(StudentDAO.class);
        Student s = dao.findById(student.getId(), false);
        if (s != null) {
            // 删除学生对象
            Classes c = s.getClasses();
            c.getStudents().remove(s);
            dao.makeTransient(s);

            // 设置提示信息
            addMessage(request, "student.msg.delete.success");

            request.setAttribute("classes", c);
        } else {
            addMessage(request, "student.msg.update.notexist");
        }

        return mapping.findForward("list");
    }
}