基于JSP学生成绩管理系统软件的开发(源代码+论文).zip

package plib; import java.io.*; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; public class ClassSvlt extends HttpServlet{ public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { String class_id =req.getParameter("id"); int success = 0; String action = req.getParameter("action"); classp cla = null; String message=""; if ("new".equalsIgnoreCase(action)) { cla = doNew(req,res); sendBean(req, res, cla,"/getClass.jsp"); } if ("update".equalsIgnoreCase(action)) { try{ cla = doUpdate(req,res, class_id); sendBean(req,res,cla,"/getClass.jsp"); } catch(SQLException e){} } if ("delete".equalsIgnoreCase(action)) { try{ success = doDelete(class_id); } catch(SQLException e){} if (success != 1) { doError(req, res, "ClassSvlt: Delete unsuccessful. Rows affected: " + success); } else { res.sendRedirect("http://localhost:8084/CJGLXT/getClass.jsp"); }} } public classp doNew(HttpServletRequest req,HttpServletResponse res ) throws ServletException,IOException{ classp cla= new classp(); String class_id=req.getParameter("id"); String tea_id=req.getParameter("tea_id"); String cour_id=req.getParameter("cour_id"); String room_id=req.getParameter("room_id"); String cour_time=req.getParameter("cour_time"); if(isTrue(req,res,class_id) && hasMoreclass(tea_id,cour_time,req,res) ){ cla.setId(class_id); cla.setTea_id(tea_id); cla.setCour_id(cour_id); cla.setRoom_id(room_id); cla.setCour_time(cour_time); cla.addClass(); } return cla; } public boolean hasMoreclass(String tea_id,String cour_time,HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException{ boolean f=true; String temp=""; String message=""; classp cla=new classp(); temp=cla.hasMoreclass(tea_id,cour_time); if (temp=="no") f=true; else { f=false; message="对不起，该教师("+tea_id+")在"+cour_time+"时间已经安排有课"+temp+"" ; doError(req,res,message); } return f; } public boolean hasChange(String tea_id,String cour_time, HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException{ boolean f=false; String tea_id0=req.getParameter("tea_id0"); String cour_time0=req.getParameter("cour_time0"); if(!tea_id.equals(tea_id0) || !cour_time.equals(cour_time0) ) f=true; return f; } public classp doUpdate(HttpServletRequest req,HttpServletResponse res , String id) throws ServletException,IOException,SQLException { classp cla = new classp(); String tea_id=req.getParameter("tea_id"); String cour_id=req.getParameter("cour_id"); String room_id=req.getParameter("room_id"); String cour_time=req.getParameter("cour_time"); if(hasChange(tea_id,cour_time,req,res)){ if(hasMoreclass(tea_id,cour_time,req,res)){ cla.updateClass(id,tea_id,cour_id,room_id,cour_time); }}else{ cla.updateClass(id,cour_id,room_id); } return cla; } public int doDelete(String id) throws SQLException { int num=0; classp cla=new classp(); num=cla.deleteClass(id); return num; } public void sendBean(HttpServletRequest req, HttpServletResponse res, classp cla, String target) throws ServletException, IOException { req.setAttribute("cla", cla); RequestDispatcher rd = getServletContext().getRequestDispatcher(target); rd.forward(req, res); } public void doError(HttpServletRequest req, HttpServletResponse res, String str) throws ServletException, IOException { req.setAttribute("problem", str); RequestDispatcher rd = getServletContext().getRequestDispatcher("/errorpage.jsp"); rd.forward(req, res); } public boolean isTrue(HttpServletRequest req, HttpServletResponse res, String id) throws ServletException, IOException { classp cla = new classp(); boolean f=true; String message =""; if(id==null || id.equals("")) { f=false; message="错误，班级号不能为空！"; doError(req,res,message); } if(cla.hasLogin(id)){ f=false; message="对不起，班级("+id+")已经注册了！"; doError(req,res,message); } return f; } public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { doGet(req, res); } }