javaweb实训-学生选课系统源码.zip

package Servlet.StudentServiceServlet; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; import dao.CourseDao; import dao.impl.CourseDaoImpl; import model.Course; import model.User; import service.CourseService; import service.StudentService; import service.impl.CourseImp; import service.impl.StudentImp; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.lang.reflect.Type; import java.util.Arrays; import java.util.List; @WebServlet(asyncSupported=true, urlPatterns={"/Servlet/StudentServlet","/student/StudentServlet"} ) public class StudentServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("Servlet/StudentServlet"); String mothed=request.getParameter("mothed"); if(mothed==null) mothed=""; switch(mothed) { case "searchAllCourses": try { searchAllCourses(request,response); } catch (Exception e) { e.printStackTrace(); } break; case "pickCourse": pickCourse(request,response); break; case "searchPickedAllCourses": searchPickedAllCourses(request,response); break; case "cancelPickedCourse": cancelPickedCourse(request,response); break; case "searchUnpickedCourses": try { searchUnpickedCourses(request,response); } catch (Exception e) { e.printStackTrace(); } break; case "searchUnpickedCourses1": try { searchUnpickedCourses1(request,response); } catch (Exception e) { e.printStackTrace(); } break; case "searchPickedAllCourses1": searchPickedAllCourses1(request,response); break; case "pickingCourses": try { pickingCourses(request,response); } catch (Exception e) { e.printStackTrace(); } break; case "searchUnpickedCourses2": try { searchUnpickedCourses2(request, response); } catch (Exception e) { e.printStackTrace(); } break; default: break; } } /*查询所有课程 * 跳转到选课的界面*/ public void searchAllCourses(HttpServletRequest request, HttpServletResponse response) throws Exception { CourseDao courseDao=new CourseDaoImpl(); List<Course> courses=courseDao.gets(); request.setAttribute("courses", courses); request.getRequestDispatcher("/student/GetPickedCourses.jsp").forward(request, response); } /*查询所有的未选择的课程 * 跳转到 选择课程的界面*/ public void searchUnpickedCourses(HttpServletRequest request, HttpServletResponse response) throws Exception { User user=(User)request.getSession().getAttribute("userDao"); String stuid=user.getName(); CourseDao coursedao=new CourseDaoImpl(); List<Course> courses=coursedao.getUnpickedCourse(stuid); request.setAttribute("courses", courses); request.getRequestDispatcher("/student/GetPickedCourses.jsp").forward(request, response); } /*选择课程*/ public void pickCourse(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ User user=(User)request.getSession().getAttribute("userDao"); String stuid=user.getName(); String cno=request.getParameter("cno"); StudentService studentdao=new StudentImp(); String error=""; try { studentdao.pickedCourse(stuid, Integer.valueOf(cno)); } catch (Exception e) { error=""+e.getMessage(); } if(error.equals("")) { request.getRequestDispatcher("../student/StudentServlet?mothed=searchUnpickedCourses1").forward(request, response); }else { request.setAttribute("error", error); request.getRequestDispatcher("/student/PickingCourse.jsp").forward(request, response); } } /*查询所有未选择的课程 * 查询完毕后跳转到 选课界面*/ public void searchPickedAllCourses(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ User user=(User)request.getSession().getAttribute("userDao"); String stuid=user.getName(); StudentService studentdao=new StudentImp(); List<Course> courses=studentdao.getSingleStudent(stuid).getCourses(); request.setAttribute("courses", courses); request.getRequestDispatcher("../student/GetPickedCourses.jsp").forward(request, response); } /*退选 * 执行完毕后重新查询所有未选的课程*/ public void cancelPickedCourse(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ User user=(User)request.getSession().getAttribute("userDao"); String stuid=user.getName(); String cno=request.getParameter("cno"); StudentService studentdao=new StudentImp(); String error=""; try { studentdao.cancelPickedCourse(stuid, Integer.valueOf(cno)); } catch (Exception e) { error=""+e.getMessage(); } request.setAttribute("error", error); request.getRequestDispatcher("../student/StudentServlet?mothed=searchPickedAllCourses").forward(request, response); } /*跳转到 选课（即查看未选课程） 界面*/ public void searchUnpickedCourses1(HttpServletRequest request, HttpServletResponse response) throws Exception { User user=(User)request.getSession().getAttribute("userDao"); String stuid=user.getName(); CourseService coursedao=new CourseImp(); List<Course> courses=coursedao.getUnpickedCourse(stuid); for (int i = 0; i < courses.size(); i++) { System.out.println("courses.get(i).getCname():"+courses.get(i).getCname()); } request.setAttribute("courses", courses); request.getRequestDispatcher("../student/PickingCourse.jsp").forward(request, response); } /*跳转到 选课（即查看未选课程） 界面*/ public void searchUnpickedCourses2(HttpServletRequest request, HttpServletResponse response) throws Exception { User user=(User)request.getSession().getAttribute("userDao"); String stuid=user.getName(); CourseService coursedao=new CourseImp(); List<Course> courses=coursedao.getUnpickedCourse(stuid); for (int i = 0; i < courses.size(); i++) { System.out.println("courses.get(i).getCname():"+courses.get(i).getCname()); } request.setAttribute("courses", courses); // response.sendRedirect("../student/PickCourse.jsp"); request.getRequestDispatcher("../student/PickCourse.jsp").forward(request, response); } /*跳转到 查看已选课程 界面*/ public void searchPickedAllCourses1(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ User user=(User)request.getSession().getAttribute("userDao"); String stuid=user.getName(); StudentService studentdao=new StudentImp(); List<Course> courses=studentdao.getSingleStudent(stuid).getCourses(); reque