package actions;import java.util.List;import org.jfree.chart.ChartFactory;import org.jfree.chart.JFreeChart;import org.jfree.chart.plot.PlotOrientation;import org.jfree.data.category.DefaultCategoryDataset;import bean.Vote;import bean.VoteOption;import com.opensymphony.xwork2.ActionSupport;import dao.VoteDAO;import dao.VoteOptionDAO;import daoFactory.VoteDAOFactory;import daoFactory.VoteOptionDAOFactory;public class VoteResultAction extends ActionSupport {    private JFreeChart chart;    private int voteID;//投票ID        public int getVoteID() {        return voteID;    }    public void setVoteID(int voteID) {        this.voteID = voteID;    }    public JFreeChart getChart() {        VoteDAO voteDAO = VoteDAOFactory.getVoteDAOInstance();//获得VoteDAO实例        VoteOptionDAO voteOptionDAO =             VoteOptionDAOFactory.getVoteOptionDAOInstance();//获得voteOption实例        //根据投票ID得到的投票        Vote vote = voteDAO.findVoteById(voteID);        String voteName = vote.getVoteName();    //得到投票名称                //根据投票ID得到所有的投票选项        List<VoteOption> voteOptions = voteOptionDAO.findVoteOptionByVoteID(voteID);                DefaultCategoryDataset dcd = new DefaultCategoryDataset();//数据源                //设置数据        for(VoteOption voteOption : voteOptions) {            dcd.setValue(voteOption.getTicketNum(),"",voteOption.getVoteOptionName());        }        //使用工厂类创建柱状图        JFreeChart chart = ChartFactory.createBarChart3D(                voteName,                "投票选项",                "投票数",                 dcd,                PlotOrientation.VERTICAL ,                false,                 true,                false);                return chart;    }    public void setChart(JFreeChart chart) {        this.chart = chart;    }        public String execute() throws Exception {        return SUCCESS;    }}

<action name="voteResult" class="actions.VoteResultAction">             <result name="success" type="chart">                 <param name="width">400</param>                 <param name="height">300</param>             </result>         </action>