struts和jfreechart结合

package cn.infocore.www;

import java.awt.Color;
import java.awt.Font;
import java.io.File;
import java.io.FileOutputStream;
import java.io.UnsupportedEncodingException;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
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.renderer.category.LineAndShapeRenderer;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;

public class CreateLinechart {
    /**
     * 图片保存的根目录
     * @param filename
     * @return
     */
    public String Savepath(){
        String path = getClass().getProtectionDomain().getCodeSource().getLocation().getPath();
        String testpath = path.substring(0,path.lastIndexOf("WEB-INF"));
        String filepath = testpath+"images/";

        System.out.println(filepath);
        return filepath;//Tomcat的中webapps目录下项目的images文件夹
    }
    
    /**
     *  柱状图,折线图 数据集 方法
     */
    public CategoryDataset getBarData(double[][] data, String[] rowKeys,     
            String[] columnKeys) {     
        return DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data);     
    
    }
    private void isChartPathExist(String chartPath) {     
        File file = new File(chartPath);     
        if (!file.exists()) {     
            file.mkdirs();     
        // log.info("CHART_PATH="+CHART_PATH+"create.");     
        }
             
    }
 
    /**
     * 折线图样式
     * @param chartTitle
     * @param x
     * @param y
     * @param xyDataset
     * @param charName
     * @return
     */