jfreechart 结合 struts2

action

package kite.struts2.action;

import java.awt.Font;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import javax.annotation.Resource;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;

import kite.domain.Question;
import kite.domain.statistics.OptionStatisticsModel;
import kite.domain.statistics.QuestionStatisticsModel;
import kite.service.StatisticsService;

@Controller("chartOutputAction")
@Scope("prototype")
public class ChartOutputAction extends BaseAction<Question>
{
    @Resource(name="statisticsService")
    StatisticsService statisticsService;
    private Integer qid;
    
    private Integer chartType;
    public String execute() throws Exception
    {
        return SUCCESS;
    }
    
    public InputStream getInputStream()
    {
        try
        {
            QuestionStatisticsModel qsm = statisticsService.statistics(qid);
            DefaultPieDataset ds = new DefaultPieDataset();
            for(OptionStatisticsModel osm : qsm.getOsms())
            {
                ds.setValue(osm.getOptionLabel(), osm.getCount());
            }
            JFreeChart chart = ChartFactory.createPieChart(qsm.getQuestion().getTitle(), ds, true, false, false);
            
            //设置标题和提示条中文
            chart.getTitle().setFont(new Font("宋体",Font.BOLD, 25));
            chart.getLegend().setItemFont(new Font("宋体", Font.BOLD, 20));
            
            PiePlot plot = (PiePlot) chart.getPlot();
            plot.setLabelFont(new Font("宋体", Font.PLAIN, 15));
            plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0}(选择人数:{1}总数:{3} 占百分比:{2})"));
            
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ChartUtilities.writeChartAsJPEG(baos, chart, 800, 600);
            ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
            return bais;
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        return null;
        
    }

    public Integer getQid()
    {
        return qid;
    }

    public void setQid(Integer qid)
    {
        this.qid = qid;
    }

    public Integer getChartType()
    {
        return chartType;
    }

    public void setChartType(Integer chartType)
    {
        this.chartType = chartType;
    }
}

struts.xml 文件配置

<action name="chartOutputAction"   class="chartOutputAction">
            <result name="success" type="stream">
                <param name="contentType">image/jpeg</param>
                <param name="inputName">inputStream</param>//getInputStream inputStream 
                <param name="bufferSize">1024</param>   
            </result>
</action>



改进 使用 struts2的 jfreechart插件  ChartResult 

修改action 文件

public JFreeChart getChart()
    {
        try
        {
            QuestionStatisticsModel qsm = statisticsService.statistics(qid);
            DefaultPieDataset ds = new DefaultPieDataset();
            for(OptionStatisticsModel osm : qsm.getOsms())
            {
                ds.setValue(osm.getOptionLabel(), osm.getCount());
            }
            JFreeChart chart = ChartFactory.createPieChart(qsm.getQuestion().getTitle(), ds, true, false, false);
            
            //设置标题和提示条中文
            chart.getTitle().setFont(new Font("宋体",Font.BOLD, 25));
            chart.getLegend().setItemFont(new Font("宋体", Font.BOLD, 20));
            
            PiePlot plot = (PiePlot) chart.getPlot();
            plot.setLabelFont(new Font("宋体", Font.PLAIN, 15));
            plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0}(选择人数:{1}总数:{3} 占百分比:{2})"));
            
            return chart;
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        return null;
        
    }

修改xml配置文件   需要继承 jfreechart-default

<action name="chartOutputAction" class="chartOutputAction">
　　<result name="success" type="chart">
　　　　<param name="height">600</param>
　　　　<param name="width">800</param>
　　　　<param name="bufferSize">1024</param>
　　</result>
</action>