最近一直想找点事情做，前几个星期马原老师说要做一份社会调查需要用到调查问卷，然后基本都是网上直接用现成的网站直接做的，我在想自己是不是也能做一个类似简单的管理系统呢。。然后一做就做了半个月，前几天总算是做好了，感觉要是自己勤快一点可能几天就能写好吧，下面是我在写这个调查系统的全部过程和遇到的问题解决方法。
首先是在脑海中构建整个系统的模型，我是喜欢根据这个模型先写好数据库的脚本，然后再写用到的POJO，和数据库相连接的sql类和mybatis的配置文件，最后将这些东西在jsp页面中拼接起来，SpringMVC算是一个粘合剂将这些东西很好的组合在一起。
我的构想：
首先和其他系统一样，应该先有一个账号以便起到多个人使用时使数据分开标识的作用，那么就应该有登录界面和注册账号页面。。这个很简单，随便搞搞就好了。
那么来到管理者的主界面，应该有创建问卷，查看/进行问卷调查，和查看问卷调查结果的功能，到这里，这个系统的大致模型已经有了。
再细想，数据库的数据表，首先应该有存放用户账号密码的表，叫user吧，其次应该有一张存放题目信息的表，叫inf吧，然后就是应该再有一张存放对应题目选项的表，叫det，然后每张表里面的数据就按照意思建就好了。
然后对应每张表，POJO类应该也有三个。。为了偷懒我直接都叫了表的名字。
下面是我mysql建表的脚本代码：
create database users; use users; create table user( username varchar(10) primary key, pwd varchar(20) ); create table inf( num int, username varchar(10), des varchar(200), foreign key(username) references user(username) ); create table det( num int, id int, opt varchar(30), username varchar(10), value int default '0', foreign key(username) references user(username) );
我的num是存题目的编号，id是存选项的编号。
然后就可以开始写POJO的java代码了，还有相应的sql语句，由于整个工程涉及的代码太多，就不一一放上来了，就挑一些重要的放，然后整个工程代码附上github的网址：https://github.com/iunique/IdeaProject。
项目基本骨架：
简介：
Dao放着和数据库相连接的代码，entity里放这POJO类，handles里面放的是页面控制器，用于处理页面映射以及起到servlet的作用，处理请求，跳转页面，config.xml放mybatis的基本配置文件，tab.xml放着sql语句，页面我用到的很多，登录界面login，注册界面register，还有相应的登录和注册判断跳转页面，然后index是用户主界面，对应着三个功能的界面，建调查问卷，进行问卷调查，查看调查文件结果。
先记录一下过程中遇到的几大问题：
1.中文乱码问题
2.WEB-INF目录下限制访问问题
3.算法问题，也就是如何用代码实现整个系统
解决方法：
1.中文乱码算是困扰我最久的问题，因为需要改的地方有很多，mysql数据库存储时的编码，解码设置，jsp页面编码解码的设置，以及mybatis配置文件中编码设置，在java代码处理数据时的编码解码设置。。只有全部搞好了才能实现中文在页面中的正常读取和呈现，少一步都不行，因为平时不用中文读取和呈现，基本没发现还有这么大的一个问题。。然后为此搞了一天最后写了博客：https://blog.csdn.net/qq_37497322/article/details/80034487
2.出于安全性考虑，jsp文件最好放在限制访问的WEB-INF目录下，
不用springMVC解决方法：https://blog.csdn.net/qq_37497322/article/details/80027464
一开始我是没用springMVC的，全部是用上面的方法+大量的web.xml配置映射+十几个servlet。。。代码量大大增加而且很复杂，最后我还是屈服了，花了一两天把代码改成了springMVC版的，映射文件和servlet全交给Controller处理。。才体会到了springMVC的强大，还有自带的表单自动填补POJO类的功能。。。简直不要太强
3.这个问题感觉是长期积累的代码感觉。。。想了一会实现方法，就写出来了，这东西感觉不好表达，或许是一年多的acm经验带来的加成吧，下面贴代码
首先是我的config.xml，也就是mybatis的配置文件,需要注意连接的时候加上字符集，url处最后加上
useUnicode=true&characterEncoding=UTF-8的字样可以解决写入数据库时的编码问题:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 和Spring整合后environment配置都会被干掉 -->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事务管理，目前由mybatis来管理 -->
<transactionManager type="JDBC" />
<!-- 数据库连接池，目前由mybatis来管理 -->
<dataSource type="POOLED"><!--有关于mysql数据库的各种信息-->
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/users?useUnicode=true&characterEncoding=UTF-8"/>
<property name="username" value="root" />
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<mappers>
<!--将操作配置文件User.xml系添加进mapper-->
<mapper resource="tab.xml" />
</mappers>
</configuration>
然后是tab.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="dom">
<resultMap type="entity.det" id="det">
<result column="num" property="num" javaType="int"/>
<result column="id" property="id" javaType="int"/>
<result column="opt" property="opt" javaType="string"/>
<result column="value" property="value" javaType="int"/>
<result column="username" property="username" javaType="string"/>
</resultMap>
<resultMap type="entity.user" id="user">
<result column="username" property="username" javaType="string"/>
<result column="pwd" property="pwd" javaType="string"/>
</resultMap>
<resultMap type="entity.inf" id="inf">
<result column="num" property="num" javaType="int"/>
<result column="username" property="username" javaType="string"/>
<result column="des" property="des" javaType="string"/>
</resultMap>
<!--查询用户是否存在-->
<select id="findUser" parameterType="java.lang.String" resultType="java.lang.Integer">
select COUNT(*) from user where username = '${value}'
</select>
<!--返回用户密码-->
<select id="findPwd" parameterType="java.lang.String" resultType="java.lang.String">
select pwd from user where username = '${value}'
</select>
<!--插入一个用户-->
<insert id="insertUser" parameterType="entity.user">
insert into user values(#{username},#{pwd})
</insert>
<!-- 通过id查询题目描述 -->
<select id="findDes" parameterType="java.lang.String" resultMap="inf">
select * from inf where username = '${value}' order by num
</select>
<!--通过num查询响应题目-->
<select id="findOneDes" parameterType="entity.inf" resultMap="inf">
select * from inf where username = #{username} and num= #{num}
</select>
<!--通过num查询所有题目的选项-->
<select id="findOptByNum" parameterType="entity.inf" resultMap="det">
select * from det where num = #{num} and username = #{username} order by id
</select>
<!--查询一个调查表中num最大值-->
<select id="findMaxNum" parameterType="java.lang.String" resultType="java.lang.Integer">
select MAX(num) from inf where username = '${value}'
</select>
<!--查询一个题中选项id的最大值-->
<select id="findMaxId" parameterType="entity.inf" resultType="java.lang.Integer">
select MAX(id) from det where username = #{username} and num = #{num}
</select>
<!--插入题目-->
<insert id="insertInf" parameterType="entity.inf">
insert into inf values(#{num},#{username},#{des})
</insert>
<!--插入题目选项-->
<insert id="insertOpt" parameterType="entity.det">
insert into det values(#{num},#{id},#{opt},#{username},default)
</insert>
<!--更新选题描述-->
<update id="updateDes" parameterType="entity.inf">
update inf set des = #{des} where username = #{username} and num = #{num}
</update>
<!--更新选项描述-->
<update id="updateOpt" parameterType="entity.det">
update det set opt = #{opt} where username = #{username} and id = #{id} and num = #{num}
</update>
<!--选项选择情况-->
<update id="updateRes" parameterType="entity.det">
update det set value = value+1 where username = #{username} and id = #{id} and num = #{num}
</update>
<!--删除题目信息-->
<delete id="deleteDes" parameterType="entity.inf">
delete from inf where num = #{num} and username =#{username}
</delete>
<!--删除单个选项信息-->
<delete id="deleteOneOpt" parameterType="entity.det">
delete from det where id= #{id} and username =#{username} and num = #{num}
</delete>
<!--删除所有选项-->
<delete id="deleteAllOpt" parameterType="entity.inf">
delete from det where username =#{username} and num = #{num}
</delete>
</mapper>
因为有很多数据库处理的动作所以很长，至于POJO类代码就不贴了，直接按alt+insert可以直接调用getter and setter直接生成POJO类
用于获得SqlSession的工具类session.java:
package Dao;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
public class session {
private final static SqlSessionFactory sqlSessionFactory;
static {
String resource = "config.xml";
InputStream inputStream=null;
try {
inputStream = Resources.getResourceAsStream(resource);
} catch (IOException e) {
e.printStackTrace();
}
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
}
public static SqlSession getSession()
{
return sqlSessionFactory.openSession(true);//这里设置成true表示支持事务，就是会更新数据库的意思，mybatis默认不支持事务
}
}
与tab.xml相对于的java类sql.java:
package Dao;
import entity.det;
import entity.inf;
import entity.user;
import org.apache.ibatis.session.SqlSession;
import java.util.List;
public class sql {
private static SqlSession session;
static {
session= Dao.session.getSession();
}
public static int findUser(String name)
{
return session.selectOne("dom.findUser",name);
}
public static String findPwd(String name)
{
return session.selectOne("dom.findPwd",name);
}
public static void insertUser(user user)
{
session.insert("dom.insertUser",user);
}
public static List<inf> findDes(String username)
{
return session.selectList("dom.findDes",username);
}
public static List<det> findOptByNum(inf t)
{
return session.selectList("dom.findOptByNum",t);
}
public static inf findOneDes(inf t)
{
return session.selectOne("findOneDes",t);
}
public static void insertInf(inf t)
{
session.insert("dom.insertInf",t);
}
public static void insertOpt(det t)
{
session.insert("dom.insertOpt",t);
}
public static int findMaxNum(String username)
{
return session.selectOne("findMaxNum",username);
}
public static int findMaxId(inf t)
{
return session.selectOne("findMaxId",t);
}
public static void updateDes(inf t)
{
session.update("dom.updateDes",t);
}
public static void updateOpt(det t)
{
session.update("dom.updateOpt",t);
}
public static void updateRes(det t)
{
session.update("dom.updateRes",t);
}
public static void deleteDes(inf t)
{
session.delete("deleteDes",t);
}
public static void deleteOneOpt(det t)
{
session.delete("deleteOneOpt",t);
}
public static void deleteAllOpt(inf t)
{
session.delete("deleteAllOpt",t);
}
}
登录界面login.jsp代码，我这里用了cookies存储登录账号密码：
<%@ page import="java.net.URLDecoder" %><%--
Created by IntelliJ IDEA.
User: hjy
Date: 18-4-24
Time: 下午8:10
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("UTF-8");
Cookie cookies[]=null;
cookies=request.getCookies();
String username="";
String pwd="";
if(cookies!=null)
{
for(Cookie c:cookies)
{
String s=c.getName();
if("username".equals(s))
{
username= URLDecoder.decode((String)c.getValue(),"UTF-8");
System.out.println(username);
}
if("pwd".equals(s))
{
pwd= URLDecoder.decode((String)c.getValue(),"UTF-8");
System.out.println(pwd);
}
}
}
%>
<html>
<head>
<title>login</title>
</head>
<body>
<form action="/servlets/login" method="post">
账号：<input name="username" value="<%=username%>"/><br/>
密码：<input type="password" name="pwd" value="<%=pwd%>"/>
<button type="submit">登录</button>
</form>
<a href="/registerPage">注册</a>
</body>
</html>
然后是创建调查问卷的create_tab.jsp，这段代码的实现完全出自于感觉。。然后注意一般用hidden属性来给要传的表加入一些用于数据处理又不想呈现出来的值，还有就是一个表格根据不同的按钮提交给不用的servlet的方法是onclick属性里面，this.form.action='xxx'：
<%--
Created by IntelliJ IDEA.
User: hjy
Date: 18-4-20
Time: 下午3:26
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" import="Dao.*" language="java" pageEncoding="UTF-8"%>
<%@ page import="java.util.List" %>
<%@ page import="entity.det" %>
<%@ page import="entity.inf" %>
<%
if(session.getAttribute("flag")!=null)
{
%>
<script> alert("添加成功");</script>
<%
session.removeAttribute("flag");
}
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>调查表建立</title>
</head>
<body>
<div>
<div>
<a href="/">回到主界面</a>
<a href="/research">查看问卷</a>
<p>已添加的题目：</p>
<%
String username=(String)session.getAttribute("username");
List<inf>l;
l=sql.findDes(username);
for(int i=0;i<l.size();i++)
{
String des=l.get(i).getDes();
List<det>lz=sql.findOptByNum(l.get(i));
%>
<form method="post">
<textarea hidden name="num"><%=(l.get(i)).getNum()%></textarea>
<textarea hidden name="username"><%=username%></textarea>
<div><%=i+1%>.题目描述：</div>
<textarea style="width: 200px;height: 80px" name="des"><%=des%>
</textarea>
<input type="submit" onclick="this.form.action='/servlets/adjdes'" value="修改描述"/>
<input type="submit" onclick="this.form.action='/servelts/deletedes'" value="删除题目"/>
</form>
<%
for(int j=0;j<lz.size();j++)
{
char c=(char)(65+j);
String tt=lz.get(j).getOpt();
%>
<form method="post">
<textarea hidden name="username"><%=username%></textarea>
<textarea hidden name="num"><%=(l.get(i)).getNum()%></textarea>
<textarea hidden name="id"><%=(lz.get(j)).getId()%></textarea>
<%=c%>.<textarea style="width: 120px;height: 25px" name="opt"><%=tt%></textarea>
<input type="submit" onclick="this.form.action='/servlets/adjopt'" value="修改选项"/>
<input type="submit" onclick="this.form.action='/servelts/deleteOneOpt'" value="删除选项"/>
</form>
<%
}
}
%>
</div>
<hr>
<p>添加题目</p>
<%
int tmp;
tmp=sql.findMaxNum(username);
inf a1=new inf();
a1.setUsername(username);
a1.setNum(tmp);
%>
当前题号:<%=l.size()%><br/>
<form method="post" action="/servlets/adjdes">
<textarea hidden name="num"><%=tmp%></textarea>
<textarea hidden name="username"><%=username%></textarea>
<div><%=l.size()%>.题目描述：</div>
<textarea style="width: 200px;height:80px" name="des"><%=sql.findOneDes(a1).getDes()%></textarea>
<button type="submit">修改描述</button>
</form>
已添加选项：<br/>
<%
List<det>l1=sql.findOptByNum(a1);
for(int i=0;i<l1.size();i++)
{
char c=(char)(65+i);
%>
<form method="post">
<textarea hidden name="username"><%=username%></textarea>
<textarea hidden name="num"><%=tmp%></textarea>
<textarea hidden name="id"><%=l1.get(i).getId()%></textarea>
<p><%=c%>.<textarea style="width: 120px;height: 25px" name="opt"><%=(l1.get(i)).getOpt()%></textarea>
<input type="submit" onclick="this.form.action='/servlets/adjopt'" value="修改选项"/>
<input type="submit" onclick="this.form.action='/servelts/deleteOneOpt'" value="删除选项"/>
</form>
<%
}
%>
<br/>
为当前题目添加选项:
<form method="post" action="/servlets/addopt">
<textarea hidden name="username"><%=username%></textarea>
<textarea hidden name="num"><%=tmp%></textarea>
<textarea hidden name="id"><%=l1.size()==0?1:((int)(sql.findMaxId(a1))+1)%></textarea>
<textarea style="width: 200px;height: 80px" name="opt"></textarea><br/>
<button type="submit">添加选项卡</button>
</form>
<a href="/servlets/addnum" style="display: block">进入下一题添加</a>
</div>
</body>
</html>
问卷调查页面tab_research.jsp：
<%@ page import="entity.inf" %>
<%@ page import="java.util.List" %>
<%@ page import="Dao.sql" %>
<%@ page import="entity.det" %><%--
Created by IntelliJ IDEA.
User: hjy
Date: 18-4-20
Time: 下午3:27
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>问卷调查</title>
</head>
<body>
<form action="/servlets/handle_submit" method="post">
<%
String username=(String)session.getAttribute("username");
List<inf>l= sql.findDes(username);
for(int i=0;i<l.size();i++)
{
%>
<p><%=i+1%>.<%=l.get(i).getDes()%></p>
<%
List<det>lz=sql.findOptByNum(l.get(i));
for(int j=0;j<lz.size();j++)
{
char c=(char)(65+j);
%>
<%=c%>.<input type="radio" name="opt<%=lz.get(j).getNum()%>" value="<%=lz.get(j).getId()%>"><%=lz.get(j).getOpt()%><br/>
<%
}
}
%>
<button type="submit" >提交</button>
</form>
</body>
</html>
然后是整个系统最重要的LoginController.java:
package handles;
import Dao.sql;
import entity.det;
import entity.det;
import entity.inf;
import entity.user;
import org.springframework.http.HttpRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.List;
@Controller
public class LoginController {
@RequestMapping("/")
public String home(HttpServletRequest req, HttpServletResponse resp) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
return "login";
}
@RequestMapping("/registerPage")
public String registerPage(HttpServletRequest req, HttpServletResponse resp) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
return "register";
}
@RequestMapping("/servlets/login")
public String login(HttpServletRequest req, HttpServletResponse resp, HttpSession session, user t) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
int tag=sql.findUser(t.getUsername());
String confirm;
if(tag==0)
{
session.setAttribute("confirm","none");
}
else
{
if((t.getPwd()).equals(sql.findPwd(t.getUsername()))) {
session.setAttribute("confirm", "true");
session.setAttribute("username", t.getUsername());
String name= URLEncoder.encode(t.getUsername(),"UTF-8");
String pwd= URLEncoder.encode(t.getPwd(),"UTF-8");
Cookie c1=new Cookie("username",t.getUsername());
c1.setMaxAge(30*24*3600);
c1.setPath("/");
resp.addCookie(c1);
Cookie c2=new Cookie("pwd",t.getPwd());
c2.setMaxAge(30*24*3600);
c2.setPath("/");
resp.addCookie(c2);
}
else
{
session.setAttribute("confirm", "false");
}
}
return "judge";
}
@RequestMapping("/create_tab")
public String create_tab(HttpServletRequest req, HttpServletResponse resp) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
return "create_tab";
}
@RequestMapping("/research")
public String research(HttpServletRequest req, HttpServletResponse resp) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
return "/tab_research";
}
@RequestMapping("/result")
public String result(HttpServletRequest req, HttpServletResponse resp) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
return "result";
}
@RequestMapping("/servlets/register")
public String register(HttpServletRequest req, HttpServletResponse resp, HttpSession session, user t) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
int tag=sql.findUser(t.getUsername());
System.out.println(tag);
String comfirm;
if(tag==0)
{
comfirm="true";
sql.insertUser(t);
inf tmp=new inf();
tmp.setNum(1);
tmp.setUsername(t.getUsername());
tmp.setDes("此处添加描述");
sql.insertInf(tmp);
session.setAttribute("username",t.getUsername());
}
else
{
comfirm="false";
}
session.setAttribute("confirm",comfirm);
return "reg_judge";
}
@RequestMapping("/servlets/adjdes")
public String adjdes(HttpServletRequest req, HttpServletResponse resp, HttpSession session, inf t) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
t.setDes(new String(t.getDes().getBytes("ISO-8859-1"),"UTF-8"));
sql.updateDes(t);
return "create_tab";
}
@RequestMapping("/servlets/adjopt")
public String adjopt(HttpServletRequest req, HttpServletResponse resp, HttpSession session, det t) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
t.setOpt(new String(t.getOpt().getBytes("ISO-8859-1"),"UTF-8"));
sql.updateOpt(t);
return "create_tab";
}
@RequestMapping("/servlets/addopt")
public String addopt(HttpServletRequest req, HttpServletResponse resp,det t) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
t.setOpt(new String(t.getOpt().getBytes("ISO-8859-1"),"UTF-8"));
sql.insertOpt(t);
return "create_tab";
}
@RequestMapping("/servlets/addnum")
public String addnum(HttpServletRequest req, HttpServletResponse resp,HttpSession session) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
String username=(String)session.getAttribute("username");
inf t=new inf();
t.setUsername(username);
t.setNum(sql.findMaxNum(username)+1);
t.setDes("此处添加描述");
sql.insertInf(t);
session.setAttribute("flag","true");
return "create_tab";
}
@RequestMapping("/servlets/handle_submit")
public String handle_submit(HttpServletRequest req, HttpServletResponse resp,HttpSession session) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
String username=(String)session.getAttribute("username");
List<inf>l=sql.findDes(username);
for(int i=0;i<l.size();i++)
{
int num=l.get(i).getNum();
String tmp=req.getParameter("opt"+num);
if(tmp==null)
continue;
det t=new det();
t.setUsername(username);
t.setNum(num);
int id=Integer.parseInt(tmp);
t.setId(id);
sql.updateRes(t);
}
return "success";
}
@RequestMapping("/servelts/deletedes")
public String deletedes(HttpServletRequest req, HttpServletResponse resp,inf t) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
sql.deleteAllOpt(t);
sql.deleteDes(t);
return "create_tab";
}
@RequestMapping("/servelts/deleteOneOpt")
public String deleteopt(HttpServletRequest req, HttpServletResponse resp,det t) throws UnsupportedEncodingException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
sql.deleteOneOpt(t);
return "create_tab";
}
}
然后附上一些项目的运行效果图。。由于还没写css和特技,所以很丑见谅owo
登录界面：
主界面：
创建调查问卷界面：
调查问卷界面：
调查结果界面：
就到这里了。。代码写的很丑请见谅qwq，这几天写css美化下～