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点赞再看，养成习惯 开发环境准备：
系统采用技术：
项目介绍用户端
管理端
项目设计运行效果
关键代码:
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");
}
}
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);
}
}
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;
}
}
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();
}
}核心代码截图
时序图
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