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JFreeChart生成图片

<!-- jfreechart begin -->  
<dependency>  
    <groupId>jfree</groupId>  
    <artifactId>jcommon</artifactId>  
    <version>1.0.23</version>  
</dependency>  
<dependency>  
    <groupId>jfree</groupId>  
    <artifactId>jfreechart</artifactId>  
    <version>1.0.19</version>  
</dependency>  
<!-- jfreechart end -->


import java.awt.Color;  
import java.awt.Font;  
import java.io.File;  
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
 
import javax.servlet.http.HttpServletRequest;
 
import org.jfree.chart.ChartFactory;  
import org.jfree.chart.ChartUtilities;  
import org.jfree.chart.JFreeChart;
import org.jfree.chart.StandardChartTheme;
import org.jfree.chart.axis.CategoryAxis;  
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
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;  
      
    /**
     * 实际取色的时候一定要16位的,这样比较准确
     *  
     */  
    public class LineChart {  
      
        private String CHART_PATH = null;
        static{
            setChartTheme();
        }
      
        public static void setChartTheme() {
            //创建主题样式
            StandardChartTheme standardChartTheme=new StandardChartTheme("CN");
            //设置标题字体
            standardChartTheme.setExtraLargeFont(new Font("黑体",Font.BOLD,25));
            //设置图例的字体
            standardChartTheme.setRegularFont(new Font("宋书",Font.TRUETYPE_FONT,12));
            //设置轴向的字体
            standardChartTheme.setLargeFont(new Font("宋书",Font.TRUETYPE_FONT,12));
            //应用主题样式
            ChartFactory.setChartTheme(standardChartTheme);
        }
        /**
         * 生成折线图
         * @throws Exception
         */  
        public String makeLineAndShapeChart(List<HashMap<String,double[]>> list,HttpServletRequest request) throws Exception {
            CHART_PATH=request.getSession().getServletContext().getRealPath("fileDisk/report/monthSummary/img/");//图片输出路径
            int size = list.size();
            //线的名称 一维数组
            String[] rowKeys = new String[size];

     //二维数组存放折线图数据
            double[][] data = http://www.mamicode.com/new double[size][12];
           //线的名称 与折线数据数组顺序对应
            String fileName="\\pic.png";  

    //横坐标
            String[] columnKeys = {"一月", "二月", "三月", "四月", "五月","六月","七月", "八月", "九月", "十月", "十一月","十二月"};
            CategoryDataset dataset = getBarData(data, rowKeys, columnKeys);
            
            File directory=null;
            File file=null;
            String chartName = (CHART_PATH + fileName);
            directory=new File(CHART_PATH);
            if (!directory.exists()) {  
                directory.mkdirs();  
            }
            file=new File(chartName);
            createTimeXYChar("机车故障地理位置分布", "月份", "故障处理数量", dataset, file);  
            return "/fileDisk/report/monthSummary/img"+fileName;
        }  
        // 折线图 数据集  
        public CategoryDataset getBarData(double[][] data, String[] rowKeys,  
                String[] columnKeys) {  
            return DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data);  
      
        }
      
        /**
         * 折线图
         *  
         * @param chartTitle:折线图标题
         * @param x :X轴名称
         * @param y :Y轴名称
         * @param xyDataset
         * @param charName
         * @return
         * @throws Exception
         */  
        public void createTimeXYChar(String chartTitle, String x, String y,CategoryDataset xyDataset, File file) throws Exception {  
            JFreeChart chart = ChartFactory.createLineChart(chartTitle, x, y, xyDataset, PlotOrientation.VERTICAL, true, true, false);  
      
            chart.setTextAntiAlias(false);  
            chart.setBackgroundPaint(Color.WHITE);  
            // 设置图标题的字体重新设置title  
            //Font font = new Font("隶书", Font.BOLD, 25);  
            TextTitle title = new TextTitle(chartTitle);  
            //title.setFont(font);  
            chart.setTitle(title);  
            // 设置面板字体  
            //Font labelFont = new Font("SansSerif", Font.TRUETYPE_FONT, 12);  
      
            chart.setBackgroundPaint(Color.WHITE);  
      
            CategoryPlot categoryplot = (CategoryPlot) chart.getPlot();  
            // x轴 // 分类轴网格是否可见  
            categoryplot.setDomainGridlinesVisible(true);  
            // y轴 //数据轴网格是否可见  
            categoryplot.setRangeGridlinesVisible(true);  
      
            categoryplot.setRangeGridlinePaint(Color.WHITE);// 虚线色彩  
      
            categoryplot.setDomainGridlinePaint(Color.WHITE);// 虚线色彩  
      
            categoryplot.setBackgroundPaint(Color.lightGray);  
      
            // 设置轴和面板之间的距离  
            // categoryplot.setAxisOffset(new RectangleInsets(5D, 5D, 5D, 5D));  
      
            CategoryAxis domainAxis = categoryplot.getDomainAxis();  
      
            //domainAxis.setLabelFont(labelFont);// 轴标题  
      
            //domainAxis.setTickLabelFont(labelFont);// 轴数值  
      
            //domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45); // 横轴上的  
            // Lable  
            // 45度倾斜  
            // 设置距离图片左端距离  
      
            domainAxis.setLowerMargin(0.0);  
            // 设置距离图片右端距离  
            domainAxis.setUpperMargin(0.0);  
      
            NumberAxis numberaxis = (NumberAxis) categoryplot.getRangeAxis();  
            numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());  
            numberaxis.setAutoRangeIncludesZero(true);  
      
            // 获得renderer 注意这里是下嗍造型到lineandshaperenderer!!  
            LineAndShapeRenderer lineandshaperenderer = (LineAndShapeRenderer) categoryplot.getRenderer();  
      
            lineandshaperenderer.setBaseShapesVisible(true); // series 点(即数据点)可见  
      
            lineandshaperenderer.setBaseLinesVisible(true); // series 点(即数据点)间有连线可见  
      
            // 显示折点数据  
            lineandshaperenderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());  
            lineandshaperenderer.setBaseItemLabelsVisible(true);
            
            FileOutputStream fos_jpg=null;  
            try {  
                fos_jpg = new FileOutputStream(file,false);  
                // 将报表保存为png文件  
                ChartUtilities.writeChartAsPNG(fos_jpg, chart, 700, 490);
                fos_jpg.close();
            } catch (Exception e) {
                e.printStackTrace();
                throw e;
            } finally {  
                try {
                    fos_jpg.close();
                } catch (Exception e) {
                    // TODO: handle exception
                }
            }  
        }  
    }  
注意:X、Y坐标轴名称在中间,不能放在末尾处

JFreeChart生成图片