简易的网上投票系统（Struts2+JFreeChart）

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1、该系统所用到的技术有：

（1）Struts2.x

（2）JFreeChart

2、该系统的文件结构如下图所示：

3、源码如下：

（1）JSP页面源码

SelectVote.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title></title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	

  </head>
  
  <body style="background-color: #6FBACD; width: 50%; height: 50%;">
    <h1><font color="blue">请选择自己的兴趣爱好：</font></h1>
    <s:form action="chartResult">
       <s:checkbox name="interest" label="篮球" fieldValue="basketball" labelposition="center"></s:checkbox>
       <s:checkbox name="interest" label="足球" fieldValue="football" labelposition="center"></s:checkbox>
       <s:checkbox name="interest" label="网球" fieldValue="tennis" labelposition="center"></s:checkbox>
       <s:checkbox name="interest" label="羽毛球" fieldValue="yumiaoqiu" labelposition="center"></s:checkbox>
       <s:checkbox name="interest" label="登山" fieldValue="dengshan" labelposition="center"></s:checkbox>
       <s:checkbox name="interest" label="游泳" fieldValue="swim" labelposition="center"></s:checkbox>
       <s:checkbox name="interest" label="围棋" fieldValue="weiqi" labelposition="center"></s:checkbox>
       <s:submit value="提交" labelposition="center"></s:submit>
    </s:form>
  </body>
</html>

（2）Action源码

ChartResultAction.java：

/**
 * @Title:ChartResultAction.java
 * @Package:com.you.action
 * @Description:
 * @author:Youhaidong(游海东)
 * @date:2013-7-28 上午10:55:26
 * @version V1.0
 */
package com.you.action;

import java.awt.Color;
import java.awt.Font;
import java.util.List;
import java.util.Map;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.title.LegendTitle;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
 * 类功能说明
 * 类修改者 修改日期
 * 修改说明
 * <p>Title:ChartResultAction.java</p>
 * <p>Description:游海东个人开发</p>
 * <p>Copyright:Copyright(c)2013</p>
 * @author:游海东
 * @date:2013-7-28 上午10:55:26
 * @version V1.0
 */
public class ChartResultAction extends ActionSupport {

	/**
	 * @Fields  serialVersionUID:序列化
	 */
	private static final long serialVersionUID = 1L;
	
	//创建chart属性
	private JFreeChart chart;
	
	//创建interest属性
	private List<String> interest;
	
	public JFreeChart getChart(){
		
		//创建JFreeChart对象
		chart = ChartFactory.createBarChart("兴趣爱好统计分布图", "兴趣爱好", "统计次数", this.getDataset(), 
				PlotOrientation.VERTICAL, true, true, false);
		//设置标题
		chart.setTitle(new TextTitle("兴趣爱好统计", new Font("黑体",Font.BOLD,20)));
		//获取CategoryPlot对象
		CategoryPlot categoryPlot = (CategoryPlot)chart.getPlot();
		//设置X，Y轴围起来的面板的颜色
		categoryPlot.setBackgroundPaint(Color.LIGHT_GRAY);
		//获取水平轴
		CategoryAxis categoryAxis = categoryPlot.getDomainAxis();
		//设置水平轴标签的字体
		categoryAxis.setLabelFont(new Font("宋体",Font.BOLD,20));
		//设置水平轴标签的倾斜度
		categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.STANDARD);
		//设置X轴的标题文字
		categoryAxis.setLabelFont(new Font("宋体",Font.BOLD,20));  
		//设置X轴坐标上的文字
        categoryAxis.setTickLabelFont(new Font("宋体",Font.BOLD,20));
		//设置水平轴标签的背景色
		categoryPlot.setDomainGridlinePaint(Color.BLUE);
		//获取竖直轴
		NumberAxis numberAxis = (NumberAxis)categoryPlot.getRangeAxis();
		//设置Y轴坐标上的文字
		numberAxis.setTickLabelFont(new Font("宋体",Font.BOLD,20)); 
		//设置Y轴的标题文字
		numberAxis.setLabelFont(new Font("宋体",Font.BOLD,20));
		//解决Legend乱码问题  
        LegendTitle legendTitle = chart.getLegend(0);
        //设置Legend的字体
        legendTitle.setItemFont(new Font("宋体",Font.BOLD,20));  
          
		return chart;
	}

	/* (non-Javadoc)
	 * <p>Title:execute</p>
	 * <p>Description:</p>
	 * @return
	 * @throws Exception
	 * @see com.opensymphony.xwork2.ActionSupport#execute()
	 */
	@Override
	public String execute() throws Exception {
		return SUCCESS;
	}
	
	//创建实现每次请求的increaseResult()方法
	@SuppressWarnings({ "rawtypes", "unchecked" })
	private void increaseResult(List<String> list){
		
		//返回ActionContext实例
		ActionContext content = ActionContext.getContext();
		//获取Application
		Map map = content.getApplication();
		//遍历传入的请求参数list
		for(String str : list)
		{
			//判断选中的选项
			if(null == map.get(str))
			{
				map.put(str, 1);
			}else{
				map.put(str, (Integer)map.get(str) + 1);
			}
			
		}
	}
	
	//创建图像的数据集
	@SuppressWarnings("rawtypes")
	private CategoryDataset getDataset(){
		
		//创建数据集
		DefaultCategoryDataset dataset = new DefaultCategoryDataset();
		//处理当前的请求
		this.increaseResult(this.getInterest());
		//获取ActionContext实例
		ActionContext content = ActionContext.getContext();
		//获取Application对象
		Map map = content.getApplication();
		//为数据集中添加数值
		dataset.setValue((Integer)map.get("basketball"), "篮球", "篮球");
		dataset.setValue((Integer)map.get("football"), "足球", "足球");
		dataset.setValue((Integer)map.get("tennis"), "网球", "网球");
		dataset.setValue((Integer)map.get("yumiaoqiu"), "羽毛球", "羽毛球");
		dataset.setValue((Integer)map.get("dengshan"), "登山", "登山");
		dataset.setValue((Integer)map.get("swim"), "游泳", "游泳");
		dataset.setValue((Integer)map.get("weiqi"), "围棋", "围棋");
		return dataset;
				 
	}

	/**
	 * @return the interest
	 */
	public List<String> getInterest() {
		return interest;
	}

	/**
	 * @param interest the interest to set
	 */
	public void setInterest(List<String> interest) {
		this.interest = interest;
	}

	/**
	 * @param chart the chart to set
	 */
	public void setChart(JFreeChart chart) {
		this.chart = chart;
	}

}

（3）struts.xml配置文件

<!DOCTYPE struts PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
          "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>

    <package name="struts2" extends="jfreechart-default">
        <action name="chartResult" class="com.you.action.ChartResultAction">
            <result name="success" type="chart">
                <param name="width">1300</param>
                <param name="height">600</param>
            </result>
        </action>
    </package>

</struts>

4、运行结果如下

（1）在浏览器地址栏输入：http://localhost:8080/votesystem/SelectVote.jsp，运行结果如下图：