基于JavaWeb的简易投票系统
Posted Mr.zhou_Zxy
tags:
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基于JavaWeb的简易投票系统
1.工具
IDEA
JDK1.8
Tomcat8.5
mysql
2.MySQL数据库
- subjects表
/*
Navicat Premium Data Transfer
Source Server : zxy
Source Server Type : MySQL
Source Server Version : 50710
Source Host : localhost:3306
Source Schema : java_test
Target Server Type : MySQL
Target Server Version : 50710
File Encoding : 65001
Date: 19/06/2021 16:16:30
*/
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for subjects
-- ----------------------------
DROP TABLE IF EXISTS `subjects`;
CREATE TABLE `subjects` (
`id` int(10) NOT NULL COMMENT '主题ID',
`title` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '主题名',
`totalVotes` int(50) NOT NULL COMMENT '投票人数',
`viewTimes` int(50) NOT NULL COMMENT '查看次数',
`createDate` date NOT NULL COMMENT '创建时间',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of subjects
-- ----------------------------
INSERT INTO `subjects` VALUES (1, '本次考试难度如何', 30, 100, '2021-06-18');
INSERT INTO `subjects` VALUES (2, '导致空气污染得主要原因是什么', 40, 200, '2021-06-18');
INSERT INTO `subjects` VALUES (3, '你幸福吗', 35, 150, '2021-06-18');
SET FOREIGN_KEY_CHECKS = 1;
- options表
/*
Navicat Premium Data Transfer
Source Server : zxy
Source Server Type : MySQL
Source Server Version : 50710
Source Host : localhost:3306
Source Schema : java_test
Target Server Type : MySQL
Target Server Version : 50710
File Encoding : 65001
Date: 19/06/2021 16:16:38
*/
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for options
-- ----------------------------
DROP TABLE IF EXISTS `options`;
CREATE TABLE `options` (
`id` int(10) NOT NULL COMMENT '选项ID',
`optContent` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '选项内容',
`vote` int(50) NOT NULL COMMENT '得票数',
`sid` int(50) NOT NULL COMMENT '主题ID，主题表外键',
PRIMARY KEY (`id`) USING BTREE,
INDEX `sid`(`sid`) USING BTREE,
CONSTRAINT `sid` FOREIGN KEY (`sid`) REFERENCES `subjects` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of options
-- ----------------------------
INSERT INTO `options` VALUES (1, '很难', 5, 1);
INSERT INTO `options` VALUES (2, '比较难', 10, 1);
INSERT INTO `options` VALUES (3, '一般', 5, 1);
INSERT INTO `options` VALUES (4, '容易', 3, 1);
INSERT INTO `options` VALUES (5, '很容易', 7, 1);
SET FOREIGN_KEY_CHECKS = 1;
3.准备工作
-
tomcat
-
mybatis-3-cfg.xml
<?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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/java_test?useUnicode=true&characterEncoding=utf8"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<!-- 让主配置文件引用映射配置文件 -->
<mappers>
<mapper resource="com/zxy/mapper/UserMapper.xml"/>
</mappers>
</configuration>
- lib
Project Structure --》Modoules --》 Dependencies --》点击“+”添加JARS,选中lib目录就可以
JSP页面
- index.jsp
<%@ page import="com.zxy.pojo.Subjects" %>
<%@ page import="java.util.List" %>
<%--
Created by IntelliJ IDEA.
User: ZXY
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>主题页面</title>
</head>
<body>
<a href="SubjectServlet">投票系统</a>
</body>
</html>
- show.jsp
<%@ page import="com.zxy.pojo.Subjects" %>
<%@ page import="java.util.List" %>
<%--
Created by IntelliJ IDEA.
User: ZXY
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>主题页面</title>
</head>
<body>
<a href="/SubjectServlet">全部主题 >></a>
<%-- <div style="text-align: center">全部主题 >></div>--%>
<form action="/OptionServlet" method="post">
<table border="1">
<tr>
<th>序号</th>
<th>主题</th>
<th>投票/查看</th>
<th>创建时间</th>
</tr>
<%
List<Subjects> subjects = (List<Subjects>) session.getAttribute("subjects");
for(Subjects lists:subjects){
%>
<tr>
<td><%=lists.getId()%></td>
<td>
<input type="submit" value="<%=lists.getTitle()%>">
</td>
<td><%=lists.getTotalVotes()%>/<%=lists.getViewTimes()%></td>
<td><%=lists.getCreateDate()%></td>
</tr>
<%
}
%>
</table>
</form>
</body>
</html>
- Option.jsp
<%@ page import="com.zxy.pojo.Options" %>
<%@ page import="java.util.List" %>
<%@ page import="com.zxy.pojo.Subjects" %><%--
Created by IntelliJ IDEA.
User: ZXY
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>投票选项</title>
</head>
<body>
<h2>本次投票难度如何</h2>
<%
List<Subjects> subjects = (List<Subjects>) session.getAttribute("subject");
for(Subjects list:subjects){
if(list.getId() == 1){
%>
<h3><%=list.getViewTimes()%>次查看,共有<%=list.getTotalVotes()%>人投票</h3>
<%
}
}
%>
<form action="/UpdateVoteServlet" method="post" id="updateVotes">
<table border="1">
<tr>
<th>序号</th>
<th>选项</th>
<th>票数</th>
<th>投票率</th>
</tr>
<%
List<Options> Options = (List<Options>) session.getAttribute("option");
subjects = (List<Subjects>) session.getAttribute("subject");
for(Subjects sub : subjects){
if(sub.getId() == 1){
int sumVote = sub.getTotalVotes();
System.out.println("sumvote");
System.out.println(sumVote);
for(Options lists:Options){
double sum = ((double)lists.getVote()/(double)sumVote) * 100;
long round = Math.round(sum * 100);
double s = round / 100.0;
System.out.println("lists.getvote()");
System.out.println(lists.getVote());
System.out.println("s");
System.out.println(s);
%>
<tr>
<td><%=lists.getId()%></td>
<td><%=lists.getOptContent()%></td>
<td><%=lists.getVote()%></td>
<td><%=s%>%</td>
</tr>
<%
}
}
}
%>
</table>
投票选项<input type="text" name="id" id="id"><br>
<span id="msg" style="font-size: 12px;color: red">${messageModel.msg}</span> <br>
<button type="button" id="loginBtn" >投票</button>
</form>
</body>
<script type="text/javascript" src="js/jquery-3.4.1.js"></script>
<script type="text/javascript">
$("#loginBtn").click(function () {
var id = $("#id").val();
if(isEmpty(id)){
$("#msg").html("投票选项不能为空!");
return;
}
$("#updateVotes").submit()
});
/**
* 判断用户名或者密码为空的函数
*/
function isEmpty(str) {
if(str == null || str.trim() == ""){
return true;
}
return false;
}
</script>
</html>
</html>
- Votes.jsp
<%@ page import="com.zxy.pojo.Options" %>
<%@ page import="java.util.List" %>
<%@ page import="com.zxy.pojo.Subjects" %><%--
Created by IntelliJ IDEA.
User: ZXY
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>投票选项</title>
</head>
<body>
<form action="/UpdateVoteServlet" method="post">
<table border="1">
<tr>
<th>序号</th>
<th>选项</th>
<th>票数</th>
<th>投票率</th>
</tr>
<%
List<Options> Options = (List<Options>) session.getAttribute("option");
List<Subjects> subjects = (List<Subjects>) session.getAttribute("subject");
for(Subjects sub : subjects){
if(sub.getId() == 1){
int sumVote = sub.getTotalVotes();
System.out.println("sumvote");
System.out.println(sumVote);
for(Options lists:Options){
double sum = ((double)lists.getVote()/(double)sumVote) * 100;
long round = Math.round(sum * 100);
double s = round / 100.0;
System.out.println("lists.getvote()");
System.out.println(lists.getVote());
System.out.println("s");
System.out.println(s);
%>
<tr>
<td><%=lists.getId()%></td>
<td><%=lists.getOptContent()%></td>
<td><%=lists.getVote()%></td>
<td><%=s%>%</td>
</tr>
<%
}
}
}
%>
</table>
</form>
<a href="/show.jsp"><input type="button" value="返回主题页面"></a>
</body>
</html>
- web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>SubjectServlet</servlet-name>
<servlet-class>com.zxy.controller.SubjectServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SubjectServlet</servlet-name>
<url-pattern>/SubjectServlet</url-pattern><!-- 访问servlet的路径 -->
</servlet-mapping>
<servlet>
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