jsp+servlet搭建在线投票问卷系统

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开发环境准备：

1. jdk1.8
2. tomcat8
3. mysql5.7
4. intellij IDEA

系统采用技术：

1. jsp+ servlet mvc三层架构模式
2. jdbc
3. jQuery+ajax
4. ECharts 4.3.0

项目介绍

用户端

1. 用户端可以查看问卷列表并参与问卷调查
2. 查看个人参与的调查报告以及整个问卷情况

管理端

1. 问卷的新增和维护
2. 用户信息维护

项目设计

运行效果

• 登录

• 添加问卷

• 问卷投票列表

• 投票详情

• 数据库表

• 代码结构截图

关键代码:

1.添加问卷：

public void doGet(HttpServletRequest request, HttpServletResponse response) throws  IOException {
 String questionTitle = request.getParameter("questionTitle"); //问卷标题
 String qId = request.getParameter("qId"); //问卷id
 Integer ops =Integer.valueOf(request.getParameter("ops"));//具体几组
 String doType=request.getParameter("doType"); //操作类型
 User user=(User)request.getSession().getAttribute(User.SESSIONNAME); SubjectService subjectService=new SubjectServiceImpl(); List subjects=new ArrayList<>(); //问题列表
 Question question=new Question(); question.setTitle(questionTitle); if("add".equalsIgnoreCase(doType)){ //如果修改添加id
 if(null!=user){//用户对象不为空，保存值
 question.setUserId(user.getId()); } }else{ question.setId(Integer.valueOf(qId)); } String title=""; for(int i=0;i

2.修改问卷信息

public void doGet(HttpServletRequest request, HttpServletResponse response) {
 int id = Integer.parseInt(request.getParameter("id")); try { SubjectService subjectService = new SubjectServiceImpl(); QuestionService questionService = new QuestionServiceImpl(); SubjectQueryModel subjectQueryModel=new SubjectQueryModel(); subjectQueryModel.setQuestionId(id); List subject = subjectService.getSubjects(subjectQueryModel);//问题列表
 subjectQueryModel.setQuestionId(id); Question question=questionService.getQuestion(id); request.setAttribute("subjects", subject); request.setAttribute("ops", subject.size());//多少组
 request.setAttribute("question", question); request.getRequestDispatcher("/WEB-INF/pages/modify.jsp") .forward(request, response); } catch (Exception e) {         throw new RuntimeException(e);
 } }

3.问卷投票

 public void doGet(HttpServletRequest request, HttpServletResponse response)  { try{ PrintWriter printWriter = response.getWriter(); int subjectId=Integer.parseInt(request.getParameter("subjectId")); String id = request.getParameter("options"); String[] ids = id.split(","); if(null==ids){ //未选中任何一项答案
 printWriter.println(0); return; }else{ User user= (User)request.getSession().getAttribute(User.SESSIONNAME); //如果登录用户，判断是否已经投过票
 if(null!=user){ RecordQueryModel recordQueryModel=new RecordQueryModel(); recordQueryModel.getUser().setId(user.getId()); recordQueryModel.getSubject().setId(subjectId); List list=recordService.getVotes(recordQueryModel); if(list.size()>0){       //当前用户已经投过票
 printWriter.println(2); return; } } List records = new ArrayList<>(); for(int i=0;i

根据jdbc直连技术，编写数据库操作工具类，方便存储数据，代码如下：

public class DBUtils {
 String url = null;    //连接地址
 String username = null;       //数据库名
 String password = null;       //数据库密码
 String driverClass = null; //连接驱动
 private static DBUtils db = new DBUtils(); /**构建数据库连接参数*/
 private DBUtils() { try { url = "jdbc:mysql://localhost:3306/shopCartDb?useUnicode=true&characterEncoding=utf8"; username = "root"; password = "root123"; driverClass = "com.mysql.jdbc.Driver"; Class.forName(driverClass); } catch (Exception e) { e.printStackTrace(); } } /**构建数据库连接对象*/
 public Connection getConnection(){ Connection conn = null; try { conn = DriverManager.getConnection(url, username, password); } catch (Exception e) { e.printStackTrace(); } return conn; } public static DBUtils getInstance(){ return db; }}

4.投票可视化代码

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 HttpSession session = request.getSession(); try { int subjectId=Integer.parseInt(request.getParameter("subjectId")); //题目
 RecordService recordService=new RecordServiceImpl(); List list=recordService.geyVotes(subjectId); if(list.size()>0){ session.setAttribute("list", list); session.setAttribute("stitle", list.get(0).getSubject().getTitle()); List opDatas=new ArrayList<>(); Map map=new HashMap<>(); for(Record r:list){ if(null!=r.getOption()){ if(!opDatas.contains(r.getOption().getContent())){ opDatas.add(r.getOption().getContent()); map.put(r.getOption().getContent(),0); } map.put(r.getOption().getContent(),map.get(r.getOption().getContent())+1); }
 } String opData=""; for(String o:opDatas){ opData=opData+"'"+o+"',"; } if(opData.length()>0){ opData=opData.substring(0,opData.length()-1); } session.setAttribute("opData", opData);   //选项
 String datavn=""; for (String key : map.keySet()) { datavn=datavn+"{ value: "+map.get(key)+", name: '"+key+"' },"; } if(datavn.length()>0){ datavn=datavn.substring(0,datavn.length()-1); } session.setAttribute("datavn", datavn); request.getRequestDispatcher("/WEB-INF/pages/view.jsp").forward(request, response); return; }else{ request.setAttribute("exception","暂无问卷结果！");
 request.getRequestDispatcher("/WEB-INF/pages/500.jsp").forward(request, response); return; } } catch (ReTryException e) { request.getSession().setAttribute("message", e.getMessage()); response.sendRedirect(request.getContextPath()+"/m/view"); }catch(Exception ex){ ex.printStackTrace(); } }

核心代码截图

• 我的发布后台程序

• 管理员维护界面后台代码

• 管理员创建界面后台代码

时序图

• mvc流程图

• 问卷操作时序图

• 用户注册登录时序图