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东北大学 实践考核类课二 选课系统 public class ChooseClass extends HttpServlet { private static final Log log = LogFactory.getLog(ChooseClass.class); /** * Constructor of the object. */ public ChooseClass() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * 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/html"); PrintWriter out = response.getWriter(); HttpSession session=request.getSession(true); String stuid=(String) session.getAttribute("usr"); String[] list=request.getParameterValues("chooselist"); for(int count=0;count<list.length;count++){ StudentDAO stu=new StudentDAO(); Student student=new Student(); Beans.ChooseClass choose=new Beans.ChooseClass(); student=stu.findById(stuid); ClassesDAO cla=new ClassesDAO(); Classes classes=new Classes(); ChooseClassDAO cho=new ChooseClassDAO(); classes=cla.findById(list[count]); choose.setClasses(classes); choose.setStudent(student); cho.save(choose); ClassesDAO cladao=new ClassesDAO(); Classes clas=choose.getClasses(); int num=clas.getNumOfStu(); clas.setNumOfStu(num-1); cladao.attachDirty(clas); } log.info("选课成功"); response.sendRedirect("choosesuc.jsp");//选课成功页面 } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }

beginning java object 课后实验