【Java】jsp+servlet搭建在线投票问卷系统

Z时代
2024-01-10
分类：技术分享

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开发环境准备：

jdk1.8

tomcat8

mysql5.7

intellij IDEA

系统采用技术：

jsp+ servlet mvc三层架构模式

jdbc

jQuery+ajax

ECharts 4.3.0

项目介绍

用户端

用户端可以查看问卷列表并参与问卷调查

查看个人参与的调查报告以及整个问卷情况

管理端

问卷的新增和维护

用户信息维护

项目设计

【Java】jsp+servlet搭建在线投票问卷系统

运行效果

【Java】jsp+servlet搭建在线投票问卷系统

添加问卷

【Java】jsp+servlet搭建在线投票问卷系统

问卷投票列表

【Java】jsp+servlet搭建在线投票问卷系统

投票详情

【Java】jsp+servlet搭建在线投票问卷系统

数据库表

【Java】jsp+servlet搭建在线投票问卷系统

代码结构截图

【Java】jsp+servlet搭建在线投票问卷系统

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<Subject> 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<ops;i++){ int number = Integer.parseInt(request.getParameter("number"+i)); String[] os = request.getParameterValues("options"+i); String[] osIds = request.getParameterValues("optionsIds"+i);//选项id
title=request.getParameter("title"+i);//问题标题
String titleId=request.getParameter("titleId"+i);//问题id
Subject subject = new Subject(); subject.setOrderId(i); subject.setTitle(title); subject.setNumber(number); if(null!=titleId&&!"".equalsIgnoreCase(titleId)){//设置问题id
subject.setId(Integer.valueOf(titleId)); } for(int i1=0;i1<os.length;i1++){ Option op = new Option(); op.setContent(os[i1]); if("modify".equalsIgnoreCase(doType)){ //如果修改添加id
op.setId(Integer.valueOf(osIds[i1])); } subject.getOptions().add(op); } try { long startTime=new Date().getTime(); subject.setStartTime(startTime); subject.setEndTime(startTime+1*24*60*60*1000); subject.setMaster(user); subjects.add(subject); } catch (ReTryException e) { HttpSession session = request.getSession(); session.setAttribute("subject", subject); session.setAttribute("message", e.getMessage()); response.sendRedirect(request.getContextPath() + "/m/add"); } catch (Exception ex) { throw new RuntimeException(ex); } } try{ if("add".equalsIgnoreCase(doType)){//添加
subjectService.add(question,subjects); }else{//修改
subjectService.modify(question,subjects); } }catch (Exception e){ e.printStackTrace(); }
if(null!=user&&user.getRole().equalsIgnoreCase("user")){ response.sendRedirect(request.getContextPath() + "/list?action=myRelease");//用户查看自己的发布
}else{ response.sendRedirect(request.getContextPath() + "/list?action=index"); }}

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> 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<Record> list=recordService.getVotes(recordQueryModel); if(list.size()>0){       //当前用户已经投过票
printWriter.println(2); return; } } List<Record> records = new ArrayList<>(); for(int i=0;i<ids.length;i++){ Record record = new Record(); record.getSubject().setId(subjectId); record.getOption().setId(Integer.parseInt(ids[i])); if(null!=user){ record.getUser().setId(user.getId()); } records.add(record); } try { recordService.vote(records); //保存问卷信息
printWriter.println(1);//参与成功
return; } catch (ReTryException e) { e.printStackTrace(); printWriter.println(3);//参与成功return; }catch(Exception ex){ ex.printStackTrace(); throw new RuntimeException(ex); } } }  catch (Exception e){ e.printStackTrace(); } }

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<Record> list=recordService.geyVotes(subjectId); if(list.size()>0){ session.setAttribute("list", list); session.setAttribute("stitle", list.get(0).getSubject().getTitle()); List<String> opDatas=new ArrayList<>(); Map<String,Integer> 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(); } }