SSM demo ：投票系统

框架：

Spring

SpringMVC

MyBatis

题目：

投票系统

导包:

1, spring

2, MyBatis

3, mybatis-spring

4, fastjson

5, aspectweaver----AspectJ框架

6, log4j-----打印日志信息

7, ojdbc6.jar

8, jstl.jar, standard.jar----标准标签库

9, commons-logging-1.2.jar

10,……

建立包结构

配置web.xml，spring-mvc.xml，spring-all.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

     <!-- 告诉web容器log4j的属性文件所在位置 -->
     <context-param>
         <param-name>log4jConfigLocation</param-name>
         <param-value>classpath:conf/log4j.properties</param-value>
     </context-param>
     <listener>
         <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
     </listener>

     <!-- spring框架提供的字符编码过滤器 -->
     <filter>
         <filter-name>characterEncodingFilter</filter-name>
         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
         <init-param>
             <param-name>encoding</param-name>
             <param-value>UTF-8</param-value>
         </init-param>
         <init-param>
             <param-name>forceEncoding</param-name>
             <param-value>true</param-value>
         </init-param>
     </filter>
     <filter-mapping>
         <filter-name>characterEncodingFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>

     <!-- 加载spring配置文件 -->
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:conf/spring-config.xml</param-value>
     </context-param>
     <listener>
         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
     </listener>

     <!-- 加载springmvc配置文件 -->
     <servlet>
         <servlet-name>springDispatcherServlet</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>classpath:conf/spring-mvc.xml</param-value>
         </init-param>
         <load-on-startup>1</load-on-startup>
     </servlet>
     <servlet-mapping>
         <servlet-name>springDispatcherServlet</servlet-name>
         <url-pattern>*.do</url-pattern>
     </servlet-mapping>
 </web-app>

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns:context="http://www.springframework.org/schema/context"
     xmlns:mvc="http://www.springframework.org/schema/mvc"
     xmlns:p="http://www.springframework.org/schema/p"
     xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

 <!-- 引入数据库信息的属性文件 -->
     <context:property-placeholder location="classpath:conf/db_orcl.properties" />

     <!-- 配置扫描器 -->
     <context:component-scan base-package="com.hanqi.dao.impl" />

     <!-- 配置数据源 -->
     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
         <property name="username" value="${jdbc.username}"></property>
         <property name="password" value="${jdbc.password}"></property>
         <property name="driverClassName" value="${jdbc.driverClassName}"></property>
         <property name="url" value="${jdbc.url}"></property>
     </bean>

     <!-- 配置Mybatis核心对象 SessionFactory -->
     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <!-- mybatis中使用的别名 -->
         <property name="typeAliasesPackage" value="com.hanqi.model"></property>
         <!-- 注入数据源属性 -->
         <property name="dataSource" ref="dataSource"></property>
         <!-- Mybatis需要的映射文件 -->
         <property name="mapperLocations" value="classpath:com/hanqi/dao/impl/*Mapper.xml"></property>
     </bean>

     <!-- mybatis所有的映射接口 -->
     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
         <property name="basePackage" value="com.hanqi.dao"></property>
         <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
     </bean>
 </beans>

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
     xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p"
     xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

     <!-- 配置扫描器 -->
     <context:component-scan base-package="com.hanqi.controller" />

     <!-- 配置视图解析器 -->
     <bean
         class="org.springframework.web.servlet.view.InternalResourceViewResolver"
         p:prefix="/" p:suffix=".jsp"></bean>

     <!-- 开启mvc注解驱动 -->
     <mvc:annotation-driven>
         <!-- springMVC有一个默认的json格式的转换器, 是基于Jackson.jar, 但实际开发当中, fastjson -->
         <mvc:message-converters register-defaults="false">
             <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                 <!-- 配置支持的媒体类型 -->
                 <property name="supportedMediaTypes">
                     <list>
                         <!-- 顺序不能写反, 否则会出现下载提示 -->
                         <value>text/html; charset=utf-8</value>
                         <value>application/json; charset=utf-8</value>
                     </list>
                 </property>
             </bean>
         </mvc:message-converters>
     </mvc:annotation-driven>
 </beans>

包结构文件：

model层---实体类：

 package com.hanqi.model;

 public class XiangMu {

     private String ids;
     private String title;
     private String selectiontype;
     private String isover;

     public XiangMu(String ids, String title, String selectiontype, String isover) {
         super();
         this.ids = ids;
         this.title = title;
         this.selectiontype = selectiontype;
         this.isover = isover;
     }

     public XiangMu() {
         super();
         // TODO Auto-generated constructor stub
     }

     public String getIds() {
         return ids;
     }

     public void setIds(String ids) {
         this.ids = ids;
     }

     public String getTitle() {
         return title;
     }

     public void setTitle(String title) {
         this.title = title;
     }

     public String getSelectiontype() {
         return selectiontype;
     }

     public void setSelectiontype(String selectiontype) {
         this.selectiontype = selectiontype;
     }

     public String getIsover() {
         return isover;
     }

     public void setIsover(String isover) {
         this.isover = isover;
     }

     @Override
     public String toString() {
         return "XiangMu [ids=" + ids + ", title=" + title + ", selectiontype=" + selectiontype + ", isover=" + isover
                 + "]";
     }

 }

 package com.hanqi.model;

 public class XuanXiang {

     private String ids;
     private String options;
     private Integer numbers;
     private String timudaihao;
     private String baifenb;

     public XuanXiang() {
         super();
         // TODO Auto-generated constructor stub
     }

     public XuanXiang(String ids, String options, Integer numbers, String timudaihao) {
         super();
         this.ids = ids;
         this.options = options;
         this.numbers = numbers;
         this.timudaihao = timudaihao;
     }

     public String getBaifenb() {
         return baifenb;
     }

     public void setBaifenb(String baifenb) {
         this.baifenb = baifenb;
     }

     public String getIds() {
         return ids;
     }

     public void setIds(String ids) {
         this.ids = ids;
     }

     public String getOptions() {
         return options;
     }

     public void setOptions(String options) {
         this.options = options;
     }

     public Integer getNumbers() {
         return numbers;
     }

     public void setNumbers(Integer numbers) {
         this.numbers = numbers;
     }

     public String getTimudaihao() {
         return timudaihao;
     }

     public void setTimudaihao(String timudaihao) {
         this.timudaihao = timudaihao;
     }

     @Override
     public String toString() {
         return "XuanXiang [ids=" + ids + ", options=" + options + ", numbers=" + numbers + ", xiangmuid=" + timudaihao
                 + "]";
     }

 }

dao层---接口：

 package com.hanqi.dao;

 import java.util.List;

 import com.hanqi.model.XiangMu;
 import com.hanqi.model.XuanXiang;

 public interface TouPiaoDao {

     List<XiangMu> selectAllXiangMu();

     List<XuanXiang> selectAllXuanXiang();

     int updatexuanxiang(String xuanxiang,int i);

     int selectXuanXiang(String xuanxiang);
 }

dao层---实现方法：

 <?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="com.hanqi.dao.TouPiaoDao">

     <select id="selectAllXiangMu" resultType="XiangMu">
         select t.* from DIAOYANTIMU  t where t.ids=101
     </select>
     <select id="selectAllXuanXiang" resultType="XuanXiang" parameterType="String">
         select t.* from DIAOYANXUANXIANG  t where t.timudaihao=101
     </select>
     <select id="selectXuanXiang" resultType="Integer">
         select t.numbers from DIAOYANXUANXIANG  t where t.options=#{xuanxiang}
     </select>

     <update id="updatexuanxiang">
         update DIAOYANXUANXIANG t set t.numbers=#{param2} where t.options=#{param1}
     </update>

 </mapper>

controller层---控制器：

 package com.hanqi.controller;

 import java.text.NumberFormat;
 import java.util.ArrayList;
 import java.util.List;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.bind.annotation.SessionAttributes;
 import org.springframework.web.servlet.ModelAndView;

 import com.alibaba.fastjson.JSONObject;
 import com.hanqi.dao.TouPiaoDao;
 import com.hanqi.model.XiangMu;
 import com.hanqi.model.XuanXiang;

 @Controller
 @SessionAttributes("currentUser")
 @RequestMapping("/toupiao")
 public class ToupiaoController {

     @Autowired
     private TouPiaoDao tpDao;

     //@ResponseBody
     @RequestMapping("/selectall")
     public String selectAll(Model model) {
         List<XiangMu> xmlist=tpDao.selectAllXiangMu();
         List<XuanXiang> xxlist=tpDao.selectAllXuanXiang();
         model.addAttribute("xmlist", xmlist);
         model.addAttribute("xxlsit", xxlist);
         return "second";
     }

     @RequestMapping("/calcpiao")
     public String calcPiao(String xuanxiang,Model model) {

         List<XuanXiang> xxlist1=tpDao.selectAllXuanXiang();
         int i=0;
         for(XuanXiang x:xxlist1){
             if(xuanxiang.equals(x.getOptions())){
                 System.out.println("---1----");
                 i=tpDao.selectXuanXiang(xuanxiang);
                 i++;
                 int c=tpDao.updatexuanxiang(xuanxiang,i);
             }
         }

         List<XiangMu> xmlist=tpDao.selectAllXiangMu();
         List<XuanXiang> xxlist=tpDao.selectAllXuanXiang();
         double sum=0;
         for(XuanXiang x:xxlist){
             sum=sum+x.getNumbers();
         }
         NumberFormat nf= NumberFormat.getInstance();  //创建格式化类nf
         nf.setMaximumFractionDigits(2);    //数值2表示保留2位小数
         for(XuanXiang x:xxlist){

             x.setBaifenb(nf.format(
                     (double)x.getNumbers()/sum*100));
         }

         model.addAttribute("xmlist", xmlist);
         model.addAttribute("xxlsit", xxlist);
         model.addAttribute("sum", sum);

         return "second";
     }

 }

前台jsp页面：

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Insert title here</title>
 <%
     String path=request.getContextPath();
 %>
 </head>
 <body>
     <div  style="text-align: center">
         <div><h1>登錄頁名</h1></div>

         <div style="margin-top: 100px">
             <a href="<%=path %>/toupiao/selectall.do">查看所有投票項目</a><br>
             <a>專業調查</a><br>
             <a>技術調查</a><br>

         </div>
     </div>
 </body>
 </html>

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Insert title here</title>
 <%
     String path = request.getContextPath();
 %>
 </head>
 <body>
 <table  style="text-align: center">
 <form action="<%=path %>/toupiao/calcpiao.do" method="post">
     <c:forEach var="xiangmu" items="${xmlist }" >
         <tr>
             <td>${xiangmu.title }</td>
             <td>
                  <ul>
                     <c:forEach var="xuanxiang" items="${xxlsit }">
                         <li><input type="radio" name="xuanxiang" value="${xuanxiang.options }"> ${xuanxiang.options }
                             <div style="width: 100px;height:40px"><br>
                                 <div style="width: ${xuanxiang.baifenb}%;height:20px;background: green">
                                 </div>
                             ${xuanxiang.numbers}  ( ${xuanxiang.baifenb}% )
                             </div>
                         </li>
                     </c:forEach>
                 </ul>
             </td>
         </tr>

     </c:forEach>
     <input type="submit" value="提交">
 </form>
 </table>
 </body>
 </html>

效果：

总结：

　　1.前台传值乱码

从前台表单中传到controller层控制器中的变量，如果不加设置会是乱码

post方式和get方式提交的设置方法不同

这里用的是post方式，方法在spring-mvc.xml中已经设置好

gei方式需要修改xml文件

　　2.百分比的计算

经过尝试，没有在前台JSP页面中使用EL表达式将百分比计算出来，百度也没有结果，只能进行变量和数字的计算，没有两个变量之间的计算

只能在选项类定义一个百分比的成员变量

　　3.int型之间的除法结果是无穷大

需要都设置double型

　　4.取计算结果小数点后几位

     NumberFormat nf= NumberFormat.getInstance();  //创建格式化类
     nf.setMaximumFractionDigits(2);    //数值2表示保留2位小数
     nf.format((double)x.getNumbers()/sum*100));  //结果是字符串  

　　5.多选和单选

这里只写了单选，多选基本上差不多，需要注意传入的是数组，修改一下具体实现的代码

　　6.Oracle数据库中计算+1

不知道为什么直接在sql语句中计算总是报错，只能计算之后写入