JAVA课程设计
一、团队介绍
无
二、项目git地址
https://gitee.com/ZhangRongBo/online_examination_system
三、项目git提交记录截图
四、项目结构功能图与主要功能结构图
项目结构功能图：
主要功能结构图：
五、项目运行截图
1.学生登录界面
2.学生注册
3.考试界面
4.成绩查询
5.修改资料
6.管理员登录界面
7.后台管理部分界面
六、项目关键代码
public Lesson() { this.lessonDAO = new LessonDAO(); } public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { String action = request.getParameter("action"); System.out.println("获取的查询字符串：" + action); if (action == null || "".equals(action)) { return mapping.findForward("error"); } else if ("lessonQuery".equals(action)) { return lessonQuery(mapping, form, request, response); } else if ("lessonAdd".equals(action)) { return lessonAdd(mapping, form, request, response); } else if ("lessonDel".equals(action)) { return lessonDel(mapping, form, request, response); }else if("selectLesson".equals(action)){ return selectLesson(mapping, form, request, response); }else if("ready".equals(action)){ return ready(mapping, form, request, response); } request.setAttribute("error", "操作失败！"); return mapping.findForward("error"); }
private ActionForward submitTestPaper(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response){ QuestionsForm q=(QuestionsForm)form; String rightAnswer=""; float singleMark=0; float moreMark=0; String[] single=q.getAnswerArrS(); int[] singleId=q.getIdArrS(); //System.out.println(q.getID()); System.out.println("数据的长度："+single.length); float markS=40/(single.length); for(int i=0;i<single.length;i++){ //调用getRightAnswer()方法获取正确答案 rightAnswer=startExamDAO.getRightAnswer(singleId[i]); System.out.println("单选数组："+i+"********ID号"+singleId[i]+"********"+single[i]+"****正确答案"+rightAnswer); if(rightAnswer.equals(single[i])){ singleMark=singleMark+markS; //累加单选题的分数 } } System.out.println("单选题得分："+singleMark); MoreSelect[] more=q.getMoreSelect(); System.out.println("多选数组的长度："+more.length); float markM=60/(more.length); String str=""; for(int i=0;i<more.length;i++){ String[] ans=more[i].getAnswerArr(); int[] moreId=q.getIdArrM(); rightAnswer=startExamDAO.getRightAnswer(moreId[i]); System.out.println("多选数组："+i+"********ID号"+moreId[i]+"********"+more[i]+"****正确答案"+rightAnswer); for(int j=0;j<ans.length;j++){ if(ans[j]!=null) str=str+ans[j]+","; } if(str.length()>1){ str=str.substring(0,str.length()-1); } System.out.println("获取的多选题答案："+str); if(rightAnswer.equals(str)){ moreMark=moreMark+markM; //累加多选题的分数 } str=""; } System.out.println("多选题得分："+moreMark); HttpSession session = request.getSession(); String student=session.getAttribute("student").toString(); int lessonID=Integer.parseInt(session.getAttribute("lessonID").toString()); //课程ID int ret=startExamDAO.saveResult(student,lessonID,(int)Math.round(singleMark),(int)Math.round(moreMark)); if(ret>0){ request.setAttribute("submitTestPaperok", "试卷已提交，您本次考试的成绩为："+(Math.round(singleMark)+Math.round(moreMark))+"分！"); return mapping.findForward("submitTestPaperok"); }else{ return mapping.findForward("dealNull"); } } }
//找回密码（第一步） private ActionForward seekPwd1(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response){ StudentForm studentForm = (StudentForm) form; StudentForm s=studentDAO.seekPwd1(studentForm); request.setAttribute("seekPwd2", s); if(s.getID().equals("")){ request.setAttribute("error", "您输入的准考证号不存在！"); return mapping.findForward("error"); }else{ return mapping.findForward("seekPwd1"); } } // 找回密码（第二步） private ActionForward seekPwd2(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response){ StudentForm studentForm = (StudentForm) form; StudentForm s=studentDAO.seekPwd2(studentForm); request.setAttribute("seekPwd3", s); if(s.getID().equals("")){ request.setAttribute("error", "您输入的密码提示问题的答案不正确！"); return mapping.findForward("error"); }else{ return mapping.findForward("seekPwd2"); } }
public ResultSet executeQuery(String sql) { try { // 捕捉异常 conn = getConnection(); // 调用getConnection()方法构造Connection对象的一个实例conn stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); rs = stmt.executeQuery(sql); } catch (SQLException ex) { System.err.println(ex.getMessage()); // 输出异常信息 } return rs; // 返回结果集对象 } public int executeUpdate(String sql) { int result = 0; // 定义保存返回值的变量 try { // 捕捉异常 conn = getConnection(); // 调用getConnection()方法构造Connection对象的一个实例conn stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); result = stmt.executeUpdate(sql); // 执行更新操作 } catch (SQLException ex) { result = 0; // 将保存返回值的变量赋值为0 } return result; // 返回保存返回值的变量 }
<logic:iterate id="questions" name="singleQue" type="com.wgh.actionForm.QuestionsForm" scope="request" indexId="ind"> <tr> <td height=23 colspan="4" align=center nowrap> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="8%" align=right height=23>[ ${ind+1} ]</td> <td width="2%"> </td> <td width="90%" align=left nowrap style="font-size:11pt;"><bean:write name="questions" property="subject" filter="true"/> <html:hidden property="idArrS[${ind}]" name="questions"/> </td> </tr> </table> </td> </tr> <tr> <td width="8%" height=23 nowrap> </td> <td width="3%" align=center nowrap><html:radio property="answerArrS[${ind}]" styleClass="noborder" value="A"/></td> <td width="3%" align=center nowrap>A.</td> <td width="86%" align=left nowrap><bean:write name="questions" property="optionA" filter="true"/></td> </tr> <tr> <td width="8%" height=23 nowrap> </td> <td width="3%" align=center nowrap><html:radio property="answerArrS[${ind}]" styleClass="noborder" value="B"/></td> <td width="3%" align=center nowrap>B.</td> <td width="86%" align=left nowrap><bean:write name="questions" property="optionB" filter="true"/></td> </tr> <tr> <td width="8%" height=23 nowrap> </td> <td width="3%" align=center nowrap><html:radio property="answerArrS[${ind}]" styleClass="noborder" value="C"/></td> <td width="3%" align=center nowrap>C.</td> <td width="86%" align=left nowrap><bean:write name="questions" property="optionC" filter="true"/></td> </tr> <tr> <td width="8%" height=23 nowrap> </td> <td width="3%" align=center nowrap><html:radio property="answerArrS[${ind}]" styleClass="noborder" value="D"/></td> <td width="3%" align=center nowrap>D.</td> <td width="86%" align=left nowrap><bean:write name="questions" property="optionD" filter="true"/></td> </tr> </logic:iterate>
主要截取了一些诸如执行action的代码，以及前端传入form实例类的代码，以及DAO模式的存贮代码和返回后端的代码。
七、项目代码扫描结果及改正
扫描结果：
改正：
八、尚待改进
前端设计的时候并不是使用的动态化设计，并且在设计前端内容的时候没有考虑到整个去应用模块化设计，增加了后续的迭代难度。
后端中实例类的底层架构不够完美，在后续的开发工作中遇到了之前未想到的问题。归根结底是对面向对象编程的不熟悉，对类中属性和类承担的责任的不严谨导致后续迭代产生了困难。最后导致注入单选多选必须同时存在的问题。
部分功能无法实现：学生类中缺少相应的属性，使得管理员不得指定一个学生只能参加特定的考试，或者让该学生补考。