java-后台生成图表、并将图表保存为PNG图片

创建图表步骤：
* 1：创建数据集合
* 2：创建Chart：
* 3:设置抗锯齿，防止字体显示不清楚
* 4:对柱子进行渲染，
* 5:对其他部分进行渲染
* 6:使用chartPanel接收

1：引包
jcommon-1.0.20.jar
jfreechart-1.0.16-experimental.jar
jfreechart-1.0.16.jar
2:创建工具类
ChartUtils.java

package util;


import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Paint;
import java.awt.Rectangle;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Vector;


import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.StandardChartTheme;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.DateTickUnit;
import org.jfree.chart.axis.DateTickUnitType;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.block.BlockBorder;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.labels.StandardXYItemLabelGenerator;
import org.jfree.chart.labels.StandardXYToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.DefaultDrawingSupplier;
import org.jfree.chart.plot.PieLabelLinkStyle;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.chart.renderer.category.StackedBarRenderer;
import org.jfree.chart.renderer.category.StandardBarPainter;
import org.jfree.chart.renderer.xy.StandardXYBarPainter;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.TextAnchor;


/**
 * Jfreechart工具类
 * <p>
 * 解决中午乱码问题<br>
 * 用来创建类别图表数据集、创建饼图数据集、时间序列图数据集<br>
 * 用来对柱状图、折线图、饼图、堆积柱状图、时间序列图的样式进行渲染<br>
 * 设置X-Y坐标轴样式
 * <p>
 * 
 */
public class ChartUtils {
    private static String NO_DATA_MSG = "数据加载失败";
    private static Font FONT = new Font("宋体", Font.PLAIN, 12);
    public static Color[] CHART_COLORS = {
            new Color(31,129,188), new Color(92,92,97), new Color(144,237,125), new Color(255,188,117),
            new Color(153,158,255), new Color(255,117,153), new Color(253,236,109), new Color(128,133,232),
            new Color(158,90,102),new Color(255, 204, 102) };//颜色


    static {
        setChartTheme();
    }


    public ChartUtils() {
    }


    /**
     * 中文主题样式 解决乱码
     */
    public static void setChartTheme() {
        // 设置中文主题样式 解决乱码
        StandardChartTheme chartTheme = new StandardChartTheme("CN");
        // 设置标题字体
        chartTheme.setExtraLargeFont(FONT);
        // 设置图例的字体
        chartTheme.setRegularFont(FONT);
        // 设置轴向的字体
        chartTheme.setLargeFont(FONT);
        chartTheme.setSmallFont(FONT);
        chartTheme.setTitlePaint(new Color(51, 51, 51));
        chartTheme.setSubtitlePaint(new Color(85, 85, 85));


        chartTheme.setLegendBackgroundPaint(Color.WHITE);// 设置标注
        chartTheme.setLegendItemPaint(Color.BLACK);//
        chartTheme.setChartBackgroundPaint(Color.WHITE);
        // 绘制颜色绘制颜色.轮廓供应商
        // paintSequence,outlinePaintSequence,strokeSequence,outlineStrokeSequence,shapeSequence


        Paint[] OUTLINE_PAINT_SEQUENCE = new Paint[] { Color.WHITE };
        // 绘制器颜色源
        DefaultDrawingSupplier drawingSupplier = new DefaultDrawingSupplier(CHART_COLORS, CHART_COLORS, OUTLINE_PAINT_SEQUENCE,
                DefaultDrawingSupplier.DEFAULT_STROKE_SEQUENCE, DefaultDrawingSupplier.DEFAULT_OUTLINE_STROKE_SEQUENCE,
                DefaultDrawingSupplier.DEFAULT_SHAPE_SEQUENCE);
        chartTheme.setDrawingSupplier(drawingSupplier);


        chartTheme.setPlotBackgroundPaint(Color.WHITE);// 绘制区域
        chartTheme.setPlotOutlinePaint(Color.WHITE);// 绘制区域外边框
        chartTheme.setLabelLinkPaint(new Color(8, 55, 114));// 链接标签颜色
        chartTheme.setLabelLinkStyle(PieLabelLinkStyle.CUBIC_CURVE);


        chartTheme.setAxisOffset(new RectangleInsets(5, 12, 5, 12));
        chartTheme.setDomainGridlinePaint(new Color(192, 208, 224));// X坐标轴垂直网格颜色
        chartTheme.setRangeGridlinePaint(new Color(192, 192, 192));// Y坐标轴水平网格颜色


        chartTheme.setBaselinePaint(Color.WHITE);
        chartTheme.setCrosshairPaint(Color.BLUE);// 不确定含义
        chartTheme.setAxisLabelPaint(new Color(51, 51, 51));// 坐标轴标题文字颜色
        chartTheme.setTickLabelPaint(new Color(67, 67, 72));// 刻度数字
        chartTheme.setBarPainter(new StandardBarPainter());// 设置柱状图渲染
        chartTheme.setXYBarPainter(new StandardXYBarPainter());// XYBar 渲染


        chartTheme.setItemLabelPaint(Color.black);
        chartTheme.setThermometerPaint(Color.white);// 温度计


        ChartFactory.setChartTheme(chartTheme);
    }


    /**
     * 必须设置文本抗锯齿
     */
    public static void setAntiAlias(JFreeChart chart) {
        chart.setTextAntiAlias(false);


    }


    /**
     * 设置图例无边框，默认黑色边框
     */
    public static void setLegendEmptyBorder(JFreeChart chart) {
        chart.getLegend().setFrame(new BlockBorder(Color.WHITE));


    }


    /**
     * 创建类别数据集合
     */
    public static DefaultCategoryDataset createDefaultCategoryDataset(Vector<Serie> series, String[] categories) {
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();


        for (Serie serie : series) {
            String name = serie.getName();
            Vector<Object> data = serie.getData();
            if (data != null && categories != null && data.size() == categories.length) {
                for (int index = 0; index < data.size(); index++) {
                    String value = data.get(index) == null ? "" : data.get(index).toString();
                    if (isPercent(value)) {
                        value = value.substring(0, value.length() - 1);
                    }
                    if (isNumber(value)) {
                        dataset.setValue(Double.parseDouble(value), name, categories[index]);
                    }
                }
            }


        }
        return dataset;


    }


    /**
     * 创建饼图数据集合
     */
    public static DefaultPieDataset createDefaultPieDataset(String[] categories, Object[] datas) {
        DefaultPieDataset dataset = new DefaultPieDataset();
        for (int i = 0; i < categories.length && categories != null; i++) {
            String value = datas[i].toString();
            if (isPercent(value)) {
                value = value.substring(0, value.length() - 1);
            }
            if (isNumber(value)) {
                dataset.setValue(categories[i], Double.valueOf(value));
            }
        }
        return dataset;


    }


    /**
     * 创建时间序列数据
     * 
     * @param category
     *            类别
     * @param dateValues
     *            日期-值 数组
     * @param xAxisTitle
     *            X坐标轴标题
     * @return
     */
    public static TimeSeries createTimeseries(String category, Vector<Object[]> dateValues) {
        TimeSeries timeseries = new TimeSeries(category);


        if (dateValues != null) {
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
            for (Object[] objects : dateValues) {
                Date date = null;
                try {
                    date = dateFormat.parse(objects[0].toString());
                } catch (ParseException e) {
                }
                String sValue = objects[1].toString();
                double dValue = 0;
                if (date != null && isNumber(sValue)) {
                    dValue = Double.parseDouble(sValue);
                    timeseries.add(new Day(date), dValue);
                }
            }
        }


        return timeseries;
    }
    /**
     * 设置 折线图样式
     * 
     * @param plot
     * @param isShowDataLabels
     *            是否显示数据标签 默认不显示节点形状
     */
    public static void setLineRender(CategoryPlot plot, boolean isShowDataLabels) {
        setLineRender(plot, isShowDataLabels, false);
    }


    /**
     * 设置折线图样式
     * 
     * @param plot
     * @param isShowDataLabels
     *            是否显示数据标签
     */
    public static void setLineRender(CategoryPlot plot, boolean isShowDataLabels, boolean isShapesVisible) {
        plot.setNoDataMessage(NO_DATA_MSG);
        plot.setInsets(new RectangleInsets(10, 10, 0, 10), false);
        LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot.getRenderer();


        renderer.setStroke(new BasicStroke(1.5F));
        if (isShowDataLabels) {
            renderer.setBaseItemLabelsVisible(true);
            renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator(StandardCategoryItemLabelGenerator.DEFAULT_LABEL_FORMAT_STRING,
                    NumberFormat.getInstance()));
            renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE1, TextAnchor.BOTTOM_CENTER));// weizhi
        }
        renderer.setBaseShapesVisible(isShapesVisible);// 数据点绘制形状
        setXAixs(plot);
        setYAixs(plot);


    }


    /**
     * 设置时间序列图样式
     * 
     * @param plot
     * @param isShowData
     *            是否显示数据
     * @param isShapesVisible
     *            是否显示数据节点形状
     */
    public static void setTimeSeriesRender(Plot plot, boolean isShowData, boolean isShapesVisible) {


        XYPlot xyplot = (XYPlot) plot;
        xyplot.setNoDataMessage(NO_DATA_MSG);
        xyplot.setInsets(new RectangleInsets(10, 10, 5, 10));


        XYLineAndShapeRenderer xyRenderer = (XYLineAndShapeRenderer) xyplot.getRenderer();


        xyRenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
        xyRenderer.setBaseShapesVisible(false);
        if (isShowData) {
            xyRenderer.setBaseItemLabelsVisible(true);
            xyRenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
            xyRenderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE1, TextAnchor.BOTTOM_CENTER));// weizhi
        }
        xyRenderer.setBaseShapesVisible(isShapesVisible);// 数据点绘制形状


        DateAxis domainAxis = (DateAxis) xyplot.getDomainAxis();
        domainAxis.setAutoTickUnitSelection(false);
        DateTickUnit dateTickUnit = new DateTickUnit(DateTickUnitType.YEAR, 1, new SimpleDateFormat("yyyy-MM")); // 第二个参数是时间轴间距
        domainAxis.setTickUnit(dateTickUnit);


        StandardXYToolTipGenerator xyTooltipGenerator = new StandardXYToolTipGenerator("{1}:{2}", new SimpleDateFormat("yyyy-MM-dd"), new DecimalFormat("0"));
        xyRenderer.setBaseToolTipGenerator(xyTooltipGenerator);


        setXY_XAixs(xyplot);
        setXY_YAixs(xyplot);


    }


    /**
     * 设置时间序列图样式 -默认不显示数据节点形状
     * 
     * @param plot
     * @param isShowData
     *            是否显示数据
     */


    public static void setTimeSeriesRender(Plot plot, boolean isShowData) {
        setTimeSeriesRender(plot, isShowData, false);
    }


    /**
     * 设置时间序列图渲染：但是存在一个问题：如果timeseries里面的日期是按照天组织， 那么柱子的宽度会非常小，和直线一样粗细
     * 
     * @param plot
     * @param isShowDataLabels
     */


    public static void setTimeSeriesBarRender(Plot plot, boolean isShowDataLabels) {


        XYPlot xyplot = (XYPlot) plot;
        xyplot.setNoDataMessage(NO_DATA_MSG);


        XYBarRenderer xyRenderer = new XYBarRenderer(0.1D);
        xyRenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());


        if (isShowDataLabels) {
            xyRenderer.setBaseItemLabelsVisible(true);
            xyRenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
        }


        StandardXYToolTipGenerator xyTooltipGenerator = new StandardXYToolTipGenerator("{1}:{2}", new SimpleDateFormat("yyyy-MM-dd"), new DecimalFormat("0"));
        xyRenderer.setBaseToolTipGenerator(xyTooltipGenerator);
        setXY_XAixs(xyplot);
        setXY_YAixs(xyplot);


    }


    /**
     * 设置柱状图渲染
     * 
     * @param plot
     * @param isShowDataLabels
     */
    public static void setBarRenderer(CategoryPlot plot, boolean isShowDataLabels) {


        plot.setNoDataMessage(NO_DATA_MSG);
        plot.setInsets(new RectangleInsets(10, 10, 5, 10));
        BarRenderer renderer = (BarRenderer) plot.getRenderer();
        renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
        renderer.setMaximumBarWidth(0.075);// 设置柱子最大宽度


        if (isShowDataLabels) {
            renderer.setBaseItemLabelsVisible(true);
        }


        setXAixs(plot);
        setYAixs(plot);
    }


    /**
     * 设置堆积柱状图渲染
     * 
     * @param plot
     */


    public static void setStackBarRender(CategoryPlot plot) {
        plot.setNoDataMessage(NO_DATA_MSG);
        plot.setInsets(new RectangleInsets(10, 10, 5, 10));
        StackedBarRenderer renderer = (StackedBarRenderer) plot.getRenderer();
        renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
        plot.setRenderer(renderer);
        setXAixs(plot);
        setYAixs(plot);
    }


    /**
     * 设置类别图表(CategoryPlot) X坐标轴线条颜色和样式
     * 
     * @param axis
     */
    public static void setXAixs(CategoryPlot plot) {
        Color lineColor = new Color(31, 121, 170);
        plot.getDomainAxis().setAxisLinePaint(lineColor);// X坐标轴颜色
        plot.getDomainAxis().setTickMarkPaint(lineColor);// X坐标轴标记|竖线颜色


    }


    /**
     * 设置类别图表(CategoryPlot) Y坐标轴线条颜色和样式 同时防止数据无法显示
     * 
     * @param axis
     */
    public static void setYAixs(CategoryPlot plot) {
        Color lineColor = new Color(192, 208, 224);
        ValueAxis axis = plot.getRangeAxis();
        axis.setAxisLinePaint(lineColor);// Y坐标轴颜色
        axis.setTickMarkPaint(lineColor);// Y坐标轴标记|竖线颜色
        // 隐藏Y刻度
        axis.setAxisLineVisible(false);
        axis.setTickMarksVisible(false);
        // Y轴网格线条
        plot.setRangeGridlinePaint(new Color(192, 192, 192));
        plot.setRangeGridlineStroke(new BasicStroke(1));


        plot.getRangeAxis().setUpperMargin(0.1);// 设置顶部Y坐标轴间距,防止数据无法显示
        plot.getRangeAxis().setLowerMargin(0.1);// 设置底部Y坐标轴间距


    }


    /**
     * 设置XY图表(XYPlot) X坐标轴线条颜色和样式
     * 
     * @param axis
     */
    public static void setXY_XAixs(XYPlot plot) {
        Color lineColor = new Color(31, 121, 170);
        plot.getDomainAxis().setAxisLinePaint(lineColor);// X坐标轴颜色
        plot.getDomainAxis().setTickMarkPaint(lineColor);// X坐标轴标记|竖线颜色


    }


    /**
     * 设置XY图表(XYPlot) Y坐标轴线条颜色和样式 同时防止数据无法显示
     * 
     * @param axis
     */
    public static void setXY_YAixs(XYPlot plot) {
        Color lineColor = new Color(192, 208, 224);
        ValueAxis axis = plot.getRangeAxis();
        axis.setAxisLinePaint(lineColor);// X坐标轴颜色
        axis.setTickMarkPaint(lineColor);// X坐标轴标记|竖线颜色
        // 隐藏Y刻度
        axis.setAxisLineVisible(false);
        axis.setTickMarksVisible(false);
        // Y轴网格线条
        plot.setRangeGridlinePaint(new Color(192, 192, 192));
        plot.setRangeGridlineStroke(new BasicStroke(1));
        plot.setDomainGridlinesVisible(false);


        plot.getRangeAxis().setUpperMargin(0.12);// 设置顶部Y坐标轴间距,防止数据无法显示
        plot.getRangeAxis().setLowerMargin(0.12);// 设置底部Y坐标轴间距


    }


    /**
     * 设置饼状图渲染
     */
    public static void setPieRender(Plot plot) {


        plot.setNoDataMessage(NO_DATA_MSG);
        plot.setInsets(new RectangleInsets(10, 10, 5, 10));
        PiePlot piePlot = (PiePlot) plot;
        piePlot.setInsets(new RectangleInsets(0, 0, 0, 0));
        piePlot.setCircular(true);// 圆形


        // piePlot.setSimpleLabels(true);// 简单标签
        piePlot.setLabelGap(0.01);
        piePlot.setInteriorGap(0.05D);
        piePlot.setLegendItemShape(new Rectangle(10, 10));// 图例形状
        piePlot.setIgnoreNullValues(true);
        piePlot.setLabelBackgroundPaint(null);// 去掉背景色
        piePlot.setLabelShadowPaint(null);// 去掉阴影
        piePlot.setLabelOutlinePaint(null);// 去掉边框
        piePlot.setShadowPaint(null);
        // 0:category 1:value:2 :percentage
        piePlot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0}:{2}"));// 显示标签数据
    }


    /**
     * 是不是一个%形式的百分比
     * 
     * @param str
     * @return
     */
    public static boolean isPercent(String str) {
        return str != null ? str.endsWith("%") && isNumber(str.substring(0, str.length() - 1)) : false;
    }


    /**
     * 是不是一个数字
     * 
     * @param str
     * @return
     */
    public static boolean isNumber(String str) {
        return str != null ? str.matches("^[-+]?(([0-9]+)((([.]{0})([0-9]*))|(([.]{1})([0-9]+))))$") : false;
    }


}

Serie.java

package util;


import java.io.Serializable;
import java.util.Vector;


/**
 * 系列:名字和数据集合 构成一条曲线</br> 可以将serie看作一根线或者一根柱子：
 * 
 * <p>
 * 参照JS图表来描述数据：</br> series: [{ name: 'Tokyo', data: [7.0, 6.9, 9.5, 14.5]
 * },</br> { name: 'New York', data: [-0.2, 0.8, 5.7, 11.3} ]</br>
 * </p>
 * 
 */
public class Serie implements Serializable {


    private static final long serialVersionUID = 1L;
    private String name;// 名字
    private Vector<Object> data;// 数据值ֵ


    public Serie() {


    }


    /**
     * 
     * @param name
     *            名称（线条名称）
     * @param data
     *            数据（线条上的所有数据值）
     */
    public Serie(String name, Vector<Object> data) {


        this.name = name;
        this.data = data;
    }


    /**
     * 
     * @param name
     *            名称（线条名称）
     * @param array
     *            数据（线条上的所有数据值）
     */
    public Serie(String name, Object[] array) {
        this.name = name;
        if (array != null) {
            data = new Vector<Object>(array.length);
            for (int i = 0; i < array.length; i++) {
                data.add(array[i]);
            }
        }
    }


    public String getName() {
        return name;
    }


    public void setName(String name) {
        this.name = name;
    }


    public Vector<Object> getData() {
        return data;
    }


    public void setData(Vector<Object> data) {
        this.data = data;
    }


}

3:生成折线图

package chart;


import java.awt.Color;
import java.util.Vector;


import javax.swing.JFrame;
import javax.swing.SwingUtilities;


import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.block.BlockBorder;
import org.jfree.data.category.DefaultCategoryDataset;


import util.ChartUtils;
import util.Serie;


/**
 * 
 * 折线图
 *       <p>
 *       创建图表步骤：<br/>
 *       1：创建数据集合<br/>
 *       2：创建Chart：<br/>
 *       3:设置抗锯齿，防止字体显示不清楚<br/>
 *       4:对柱子进行渲染，<br/>
 *       5:对其他部分进行渲染<br/>
 *       6:使用chartPanel接收<br/>
 * 
 *       </p>
 */
public class LineChart {
    public LineChart() {
    }


    public DefaultCategoryDataset createDataset() {
        // 标注类别
        String[] categories = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
        Vector<Serie> series = new Vector<Serie>();
        // 柱子名称：柱子所有的值集合
        series.add(new Serie("Tokyo", new Double[] { 49.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4 }));
        series.add(new Serie("New York", new Double[] { 83.6, 78.8, 98.5, 93.4, 106.0, 84.5, 105.0, 104.3, 91.2, 83.5, 106.6, 92.3 }));
        series.add(new Serie("London", new Double[] { 48.9, 38.8, 39.3, 41.4, 47.0, 48.3, 59.0, 59.6, 52.4, 65.2, 59.3, 51.2 }));
        series.add(new Serie("Berlin", new Double[] { 42.4, 33.2, 34.5, 39.7, 52.6, 75.5, 57.4, 60.4, 47.6, 39.1, 46.8, 51.1 }));
        // 1：创建数据集合
        DefaultCategoryDataset dataset = ChartUtils.createDefaultCategoryDataset(series, categories);
        return dataset;
    }


    public ChartPanel createChart() {
        // 2：创建Chart[创建不同图形]
        JFreeChart chart = ChartFactory.createLineChart("Monthly Average Rainfall", "", "Rainfall (mm)", createDataset());
        // 3:设置抗锯齿，防止字体显示不清楚
        ChartUtils.setAntiAlias(chart);// 抗锯齿
        // 4:对柱子进行渲染[[采用不同渲染]]
        ChartUtils.setLineRender(chart.getCategoryPlot(), false,true);//
        // 5:对其他部分进行渲染
        ChartUtils.setXAixs(chart.getCategoryPlot());// X坐标轴渲染
        ChartUtils.setYAixs(chart.getCategoryPlot());// Y坐标轴渲染
        // 设置标注无边框
        chart.getLegend().setFrame(new BlockBorder(Color.WHITE));
        // 6:使用chartPanel接收
        ChartPanel chartPanel = new ChartPanel(chart);
        return chartPanel;
    }


    public static void main(String[] args) {
        final JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(1024, 420);
        frame.setLocationRelativeTo(null);


        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                // 创建图形
                ChartPanel chartPanel = new LineChart().createChart();
                frame.getContentPane().add(chartPanel);
                frame.setVisible(true);
            }
        });


    }


}

4：将图表保存为PNG、JPEG图片

 public static void saveAsFile(JFreeChart chart, String outputPath,      
                int weight, int height)throws Exception {      
            FileOutputStream out = null;      
                File outFile = new File(outputPath);      
                if (!outFile.getParentFile().exists()) {      
                    outFile.getParentFile().mkdirs();      
                }      
                out = new FileOutputStream(outputPath);      
                // 保存为PNG      
                ChartUtilities.writeChartAsPNG(out, chart, weight, height);      
                // 保存为JPEG      
                // ChartUtilities.writeChartAsJPEG(out, chart, weight, height);      
                out.flush();      
                if (out != null) {      
                    try {      
                        out.close();      
                    } catch (IOException e) {      
                        // do nothing      
                    }      


            }      
        }

创建图表步骤：
* 1：创建数据集合
* 2：创建Chart：
* 3:设置抗锯齿，防止字体显示不清楚
* 4:对柱子进行渲染，
* 5:对其他部分进行渲染
* 6:使用chartPanel接收

1：引包
jcommon-1.0.20.jar
jfreechart-1.0.16-experimental.jar
jfreechart-1.0.16.jar
2:创建工具类
ChartUtils.java

package util;


import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Paint;
import java.awt.Rectangle;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Vector;


import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.StandardChartTheme;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.DateTickUnit;
import org.jfree.chart.axis.DateTickUnitType;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.block.BlockBorder;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.labels.StandardXYItemLabelGenerator;
import org.jfree.chart.labels.StandardXYToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.DefaultDrawingSupplier;
import org.jfree.chart.plot.PieLabelLinkStyle;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.chart.renderer.category.StackedBarRenderer;
import org.jfree.chart.renderer.category.StandardBarPainter;
import org.jfree.chart.renderer.xy.StandardXYBarPainter;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.TextAnchor;


/**
 * Jfreechart工具类
 * <p>
 * 解决中午乱码问题<br>
 * 用来创建类别图表数据集、创建饼图数据集、时间序列图数据集<br>
 * 用来对柱状图、折线图、饼图、堆积柱状图、时间序列图的样式进行渲染<br>
 * 设置X-Y坐标轴样式
 * <p>
 * 
 */
public class ChartUtils {
    private static String NO_DATA_MSG = "数据加载失败";
    private static Font FONT = new Font("宋体", Font.PLAIN, 12);
    public static Color[] CHART_COLORS = {
            new Color(31,129,188), new Color(92,92,97), new Color(144,237,125), new Color(255,188,117),
            new Color(153,158,255), new Color(255,117,153), new Color(253,236,109), new Color(128,133,232),
            new Color(158,90,102),new Color(255, 204, 102) };//颜色


    static {
        setChartTheme();
    }


    public ChartUtils() {
    }


    /**
     * 中文主题样式 解决乱码
     */
    public static void setChartTheme() {
        // 设置中文主题样式 解决乱码
        StandardChartTheme chartTheme = new StandardChartTheme("CN");
        // 设置标题字体
        chartTheme.setExtraLargeFont(FONT);
        // 设置图例的字体
        chartTheme.setRegularFont(FONT);
        // 设置轴向的字体
        chartTheme.setLargeFont(FONT);
        chartTheme.setSmallFont(FONT);
        chartTheme.setTitlePaint(new Color(51, 51, 51));
        chartTheme.setSubtitlePaint(new Color(85, 85, 85));


        chartTheme.setLegendBackgroundPaint(Color.WHITE);// 设置标注
        chartTheme.setLegendItemPaint(Color.BLACK);//
        chartTheme.setChartBackgroundPaint(Color.WHITE);
        // 绘制颜色绘制颜色.轮廓供应商
        // paintSequence,outlinePaintSequence,strokeSequence,outlineStrokeSequence,shapeSequence


        Paint[] OUTLINE_PAINT_SEQUENCE = new Paint[] { Color.WHITE };
        // 绘制器颜色源
        DefaultDrawingSupplier drawingSupplier = new DefaultDrawingSupplier(CHART_COLORS, CHART_COLORS, OUTLINE_PAINT_SEQUENCE,
                DefaultDrawingSupplier.DEFAULT_STROKE_SEQUENCE, DefaultDrawingSupplier.DEFAULT_OUTLINE_STROKE_SEQUENCE,
                DefaultDrawingSupplier.DEFAULT_SHAPE_SEQUENCE);
        chartTheme.setDrawingSupplier(drawingSupplier);


        chartTheme.setPlotBackgroundPaint(Color.WHITE);// 绘制区域
        chartTheme.setPlotOutlinePaint(Color.WHITE);// 绘制区域外边框
        chartTheme.setLabelLinkPaint(new Color(8, 55, 114));// 链接标签颜色
        chartTheme.setLabelLinkStyle(PieLabelLinkStyle.CUBIC_CURVE);


        chartTheme.setAxisOffset(new RectangleInsets(5, 12, 5, 12));
        chartTheme.setDomainGridlinePaint(new Color(192, 208, 224));// X坐标轴垂直网格颜色
        chartTheme.setRangeGridlinePaint(new Color(192, 192, 192));// Y坐标轴水平网格颜色


        chartTheme.setBaselinePaint(Color.WHITE);
        chartTheme.setCrosshairPaint(Color.BLUE);// 不确定含义
        chartTheme.setAxisLabelPaint(new Color(51, 51, 51));// 坐标轴标题文字颜色
        chartTheme.setTickLabelPaint(new Color(67, 67, 72));// 刻度数字
        chartTheme.setBarPainter(new StandardBarPainter());// 设置柱状图渲染
        chartTheme.setXYBarPainter(new StandardXYBarPainter());// XYBar 渲染


        chartTheme.setItemLabelPaint(Color.black);
        chartTheme.setThermometerPaint(Color.white);// 温度计


        ChartFactory.setChartTheme(chartTheme);
    }


    /**
     * 必须设置文本抗锯齿
     */
    public static void setAntiAlias(JFreeChart chart) {
        chart.setTextAntiAlias(false);


    }


    /**
     * 设置图例无边框，默认黑色边框
     */
    public static void setLegendEmptyBorder(JFreeChart chart) {
        chart.getLegend().setFrame(new BlockBorder(Color.WHITE));


    }


    /**
     * 创建类别数据集合
     */
    public static DefaultCategoryDataset createDefaultCategoryDataset(Vector<Serie> series, String[] categories) {
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();


        for (Serie serie : series) {
            String name = serie.getName();
            Vector<Object> data = serie.getData();
            if (data != null && categories != null && data.size() == categories.length) {
                for (int index = 0; index < data.size(); index++) {
                    String value = data.get(index) == null ? "" : data.get(index).toString();
                    if (isPercent(value)) {
                        value = value.substring(0, value.length() - 1);
                    }
                    if (isNumber(value)) {
                        dataset.setValue(Double.parseDouble(value), name, categories[index]);
                    }
                }
            }


        }
        return dataset;


    }


    /**
     * 创建饼图数据集合
     */
    public static DefaultPieDataset createDefaultPieDataset(String[] categories, Object[] datas) {
        DefaultPieDataset dataset = new DefaultPieDataset();
        for (int i = 0; i < categories.length && categories != null; i++) {
            String value = datas[i].toString();
            if (isPercent(value)) {
                value = value.substring(0, value.length() - 1);
            }
            if (isNumber(value)) {
                dataset.setValue(categories[i], Double.valueOf(value));
            }
        }
        return dataset;


    }


    /**
     * 创建时间序列数据
     * 
     * @param category
     *            类别
     * @param dateValues
     *            日期-值 数组
     * @param xAxisTitle
     *            X坐标轴标题
     * @return
     */
    public static TimeSeries createTimeseries(String category, Vector<Object[]> dateValues) {
        TimeSeries timeseries = new TimeSeries(category);


        if (dateValues != null) {
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
            for (Object[] objects : dateValues) {
                Date date = null;
                try {
                    date = dateFormat.parse(objects[0].toString());
                } catch (ParseException e) {
                }
                String sValue = objects[1].toString();
                double dValue = 0;
                if (date != null && isNumber(sValue)) {
                    dValue = Double.parseDouble(sValue);
                    timeseries.add(new Day(date), dValue);
                }
            }
        }


        return timeseries;
    }
    /**
     * 设置 折线图样式
     * 
     * @param plot
     * @param isShowDataLabels
     *            是否显示数据标签 默认不显示节点形状
     */
    public static void setLineRender(CategoryPlot plot, boolean isShowDataLabels) {
        setLineRender(plot, isShowDataLabels, false);
    }


    /**
     * 设置折线图样式
     * 
     * @param plot
     * @param isShowDataLabels
     *            是否显示数据标签
     */
    public static void setLineRender(CategoryPlot plot, boolean isShowDataLabels, boolean isShapesVisible) {
        plot.setNoDataMessage(NO_DATA_MSG);
        plot.setInsets(new RectangleInsets(10, 10, 0, 10), false);
        LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot.getRenderer();


        renderer.setStroke(new BasicStroke(1.5F));
        if (isShowDataLabels) {
            renderer.setBaseItemLabelsVisible(true);
            renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator(StandardCategoryItemLabelGenerator.DEFAULT_LABEL_FORMAT_STRING,
                    NumberFormat.getInstance()));
            renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE1, TextAnchor.BOTTOM_CENTER));// weizhi
        }
        renderer.setBaseShapesVisible(isShapesVisible);// 数据点绘制形状
        setXAixs(plot);
        setYAixs(plot);


    }


    /**
     * 设置时间序列图样式
     * 
     * @param plot
     * @param isShowData
     *            是否显示数据
     * @param isShapesVisible
     *            是否显示数据节点形状
     */
    public static void setTimeSeriesRender(Plot plot, boolean isShowData, boolean isShapesVisible) {


        XYPlot xyplot = (XYPlot) plot;
        xyplot.setNoDataMessage(NO_DATA_MSG);
        xyplot.setInsets(new RectangleInsets(10, 10, 5, 10));


        XYLineAndShapeRenderer xyRenderer = (XYLineAndShapeRenderer) xyplot.getRenderer();


        xyRenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
        xyRenderer.setBaseShapesVisible(false);
        if (isShowData) {
            xyRenderer.setBaseItemLabelsVisible(true);
            xyRenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
            xyRenderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE1, TextAnchor.BOTTOM_CENTER));// weizhi
        }
        xyRenderer.setBaseShapesVisible(isShapesVisible);// 数据点绘制形状


        DateAxis domainAxis = (DateAxis) xyplot.getDomainAxis();
        domainAxis.setAutoTickUnitSelection(false);
        DateTickUnit dateTickUnit = new DateTickUnit(DateTickUnitType.YEAR, 1, new SimpleDateFormat("yyyy-MM")); // 第二个参数是时间轴间距
        domainAxis.setTickUnit(dateTickUnit);


        StandardXYToolTipGenerator xyTooltipGenerator = new StandardXYToolTipGenerator("{1}:{2}", new SimpleDateFormat("yyyy-MM-dd"), new DecimalFormat("0"));
        xyRenderer.setBaseToolTipGenerator(xyTooltipGenerator);


        setXY_XAixs(xyplot);
        setXY_YAixs(xyplot);


    }


    /**
     * 设置时间序列图样式 -默认不显示数据节点形状
     * 
     * @param plot
     * @param isShowData
     *            是否显示数据
     */


    public static void setTimeSeriesRender(Plot plot, boolean isShowData) {
        setTimeSeriesRender(plot, isShowData, false);
    }


    /**
     * 设置时间序列图渲染：但是存在一个问题：如果timeseries里面的日期是按照天组织， 那么柱子的宽度会非常小，和直线一样粗细
     * 
     * @param plot
     * @param isShowDataLabels
     */


    public static void setTimeSeriesBarRender(Plot plot, boolean isShowDataLabels) {


        XYPlot xyplot = (XYPlot) plot;
        xyplot.setNoDataMessage(NO_DATA_MSG);


        XYBarRenderer xyRenderer = new XYBarRenderer(0.1D);
        xyRenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());


        if (isShowDataLabels) {
            xyRenderer.setBaseItemLabelsVisible(true);
            xyRenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
        }


        StandardXYToolTipGenerator xyTooltipGenerator = new StandardXYToolTipGenerator("{1}:{2}", new SimpleDateFormat("yyyy-MM-dd"), new DecimalFormat("0"));
        xyRenderer.setBaseToolTipGenerator(xyTooltipGenerator);
        setXY_XAixs(xyplot);
        setXY_YAixs(xyplot);


    }


    /**
     * 设置柱状图渲染
     * 
     * @param plot
     * @param isShowDataLabels
     */
    public static void setBarRenderer(CategoryPlot plot, boolean isShowDataLabels) {


        plot.setNoDataMessage(NO_DATA_MSG);
        plot.setInsets(new RectangleInsets(10, 10, 5, 10));
        BarRenderer renderer = (BarRenderer) plot.getRenderer();
        renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
        renderer.setMaximumBarWidth(0.075);// 设置柱子最大宽度


        if (isShowDataLabels) {
            renderer.setBaseItemLabelsVisible(true);
        }


        setXAixs(plot);
        setYAixs(plot);
    }


    /**
     * 设置堆积柱状图渲染
     * 
     * @param plot
     */


    public static void setStackBarRender(CategoryPlot plot) {
        plot.setNoDataMessage(NO_DATA_MSG);
        plot.setInsets(new RectangleInsets(10, 10, 5, 10));
        StackedBarRenderer renderer = (StackedBarRenderer) plot.getRenderer();
        renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
        plot.setRenderer(renderer);
        setXAixs(plot);
        setYAixs(plot);
    }


    /**
     * 设置类别图表(CategoryPlot) X坐标轴线条颜色和样式
     * 
     * @param axis
     */
    public static void setXAixs(CategoryPlot plot) {
        Color lineColor = new Color(31, 121, 170);
        plot.getDomainAxis().setAxisLinePaint(lineColor);// X坐标轴颜色
        plot.getDomainAxis().setTickMarkPaint(lineColor);// X坐标轴标记|竖线颜色


    }


    /**
     * 设置类别图表(CategoryPlot) Y坐标轴线条颜色和样式 同时防止数据无法显示
     * 
     * @param axis
     */
    public static void setYAixs(CategoryPlot plot) {
        Color lineColor = new Color(192, 208, 224);
        ValueAxis axis = plot.getRangeAxis();
        axis.setAxisLinePaint(lineColor);// Y坐标轴颜色
        axis.setTickMarkPaint(lineColor);// Y坐标轴标记|竖线颜色
        // 隐藏Y刻度
        axis.setAxisLineVisible(false);
        axis.setTickMarksVisible(false);
        // Y轴网格线条
        plot.setRangeGridlinePaint(new Color(192, 192, 192));
        plot.setRangeGridlineStroke(new BasicStroke(1));


        plot.getRangeAxis().setUpperMargin(0.1);// 设置顶部Y坐标轴间距,防止数据无法显示
        plot.getRangeAxis().setLowerMargin(0.1);// 设置底部Y坐标轴间距


    }


    /**
     * 设置XY图表(XYPlot) X坐标轴线条颜色和样式
     * 
     * @param axis
     */
    public static void setXY_XAixs(XYPlot plot) {
        Color lineColor = new Color(31, 121, 170);
        plot.getDomainAxis().setAxisLinePaint(lineColor);// X坐标轴颜色
        plot.getDomainAxis().setTickMarkPaint(lineColor);// X坐标轴标记|竖线颜色


    }


    /**
     * 设置XY图表(XYPlot) Y坐标轴线条颜色和样式 同时防止数据无法显示
     * 
     * @param axis
     */
    public static void setXY_YAixs(XYPlot plot) {
        Color lineColor = new Color(192, 208, 224);
        ValueAxis axis = plot.getRangeAxis();
        axis.setAxisLinePaint(lineColor);// X坐标轴颜色
        axis.setTickMarkPaint(lineColor);// X坐标轴标记|竖线颜色
        // 隐藏Y刻度
        axis.setAxisLineVisible(false);
        axis.setTickMarksVisible(false);
        // Y轴网格线条
        plot.setRangeGridlinePaint(new Color(192, 192, 192));
        plot.setRangeGridlineStroke(new BasicStroke(1));
        plot.setDomainGridlinesVisible(false);


        plot.getRangeAxis().setUpperMargin(0.12);// 设置顶部Y坐标轴间距,防止数据无法显示
        plot.getRangeAxis().setLowerMargin(0.12);// 设置底部Y坐标轴间距


    }


    /**
     * 设置饼状图渲染
     */
    public static void setPieRender(Plot plot) {


        plot.setNoDataMessage(NO_DATA_MSG);
        plot.setInsets(new RectangleInsets(10, 10, 5, 10));
        PiePlot piePlot = (PiePlot) plot;
        piePlot.setInsets(new RectangleInsets(0, 0, 0, 0));
        piePlot.setCircular(true);// 圆形


        // piePlot.setSimpleLabels(true);// 简单标签
        piePlot.setLabelGap(0.01);
        piePlot.setInteriorGap(0.05D);
        piePlot.setLegendItemShape(new Rectangle(10, 10));// 图例形状
        piePlot.setIgnoreNullValues(true);
        piePlot.setLabelBackgroundPaint(null);// 去掉背景色
        piePlot.setLabelShadowPaint(null);// 去掉阴影
        piePlot.setLabelOutlinePaint(null);// 去掉边框
        piePlot.setShadowPaint(null);
        // 0:category 1:value:2 :percentage
        piePlot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0}:{2}"));// 显示标签数据
    }


    /**
     * 是不是一个%形式的百分比
     * 
     * @param str
     * @return
     */
    public static boolean isPercent(String str) {
        return str != null ? str.endsWith("%") && isNumber(str.substring(0, str.length() - 1)) : false;
    }


    /**
     * 是不是一个数字
     * 
     * @param str
     * @return
     */
    public static boolean isNumber(String str) {
        return str != null ? str.matches("^[-+]?(([0-9]+)((([.]{0})([0-9]*))|(([.]{1})([0-9]+))))$") : false;
    }


}

Serie.java

package util;


import java.io.Serializable;
import java.util.Vector;


/**
 * 系列:名字和数据集合 构成一条曲线</br> 可以将serie看作一根线或者一根柱子：
 * 
 * <p>
 * 参照JS图表来描述数据：</br> series: [{ name: 'Tokyo', data: [7.0, 6.9, 9.5, 14.5]
 * },</br> { name: 'New York', data: [-0.2, 0.8, 5.7, 11.3} ]</br>
 * </p>
 * 
 */
public class Serie implements Serializable {


    private static final long serialVersionUID = 1L;
    private String name;// 名字
    private Vector<Object> data;// 数据值ֵ


    public Serie() {


    }


    /**
     * 
     * @param name
     *            名称（线条名称）
     * @param data
     *            数据（线条上的所有数据值）
     */
    public Serie(String name, Vector<Object> data) {


        this.name = name;
        this.data = data;
    }


    /**
     * 
     * @param name
     *            名称（线条名称）
     * @param array
     *            数据（线条上的所有数据值）
     */
    public Serie(String name, Object[] array) {
        this.name = name;
        if (array != null) {
            data = new Vector<Object>(array.length);
            for (int i = 0; i < array.length; i++) {
                data.add(array[i]);
            }
        }
    }


    public String getName() {
        return name;
    }


    public void setName(String name) {
        this.name = name;
    }


    public Vector<Object> getData() {
        return data;
    }


    public void setData(Vector<Object> data) {
        this.data = data;
    }


}

3:生成折线图

package chart;


import java.awt.Color;
import java.util.Vector;


import javax.swing.JFrame;
import javax.swing.SwingUtilities;


import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.block.BlockBorder;
import org.jfree.data.category.DefaultCategoryDataset;


import util.ChartUtils;
import util.Serie;


/**
 * 
 * 折线图
 *       <p>
 *       创建图表步骤：<br/>
 *       1：创建数据集合<br/>
 *       2：创建Chart：<br/>
 *       3:设置抗锯齿，防止字体显示不清楚<br/>
 *       4:对柱子进行渲染，<br/>
 *       5:对其他部分进行渲染<br/>
 *       6:使用chartPanel接收<br/>
 * 
 *       </p>
 */
public class LineChart {
    public LineChart() {
    }


    public DefaultCategoryDataset createDataset() {
        // 标注类别
        String[] categories = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
        Vector<Serie> series = new Vector<Serie>();
        // 柱子名称：柱子所有的值集合
        series.add(new Serie("Tokyo", new Double[] { 49.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4 }));
        series.add(new Serie("New York", new Double[] { 83.6, 78.8, 98.5, 93.4, 106.0, 84.5, 105.0, 104.3, 91.2, 83.5, 106.6, 92.3 }));
        series.add(new Serie("London", new Double[] { 48.9, 38.8, 39.3, 41.4, 47.0, 48.3, 59.0, 59.6, 52.4, 65.2, 59.3, 51.2 }));
        series.add(new Serie("Berlin", new Double[] { 42.4, 33.2, 34.5, 39.7, 52.6, 75.5, 57.4, 60.4, 47.6, 39.1, 46.8, 51.1 }));
        // 1：创建数据集合
        DefaultCategoryDataset dataset = ChartUtils.createDefaultCategoryDataset(series, categories);
        return dataset;
    }


    public ChartPanel createChart() {
        // 2：创建Chart[创建不同图形]
        JFreeChart chart = ChartFactory.createLineChart("Monthly Average Rainfall", "", "Rainfall (mm)", createDataset());
        // 3:设置抗锯齿，防止字体显示不清楚
        ChartUtils.setAntiAlias(chart);// 抗锯齿
        // 4:对柱子进行渲染[[采用不同渲染]]
        ChartUtils.setLineRender(chart.getCategoryPlot(), false,true);//
        // 5:对其他部分进行渲染
        ChartUtils.setXAixs(chart.getCategoryPlot());// X坐标轴渲染
        ChartUtils.setYAixs(chart.getCategoryPlot());// Y坐标轴渲染
        // 设置标注无边框
        chart.getLegend().setFrame(new BlockBorder(Color.WHITE));
        // 6:使用chartPanel接收
        ChartPanel chartPanel = new ChartPanel(chart);
        return chartPanel;
    }


    public static void main(String[] args) {
        final JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(1024, 420);
        frame.setLocationRelativeTo(null);


        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                // 创建图形
                ChartPanel chartPanel = new LineChart().createChart();
                frame.getContentPane().add(chartPanel);
                frame.setVisible(true);
            }
        });


    }


}

4：将图表保存为PNG、JPEG图片

 public static void saveAsFile(JFreeChart chart, String outputPath,      
                int weight, int height)throws Exception {      
            FileOutputStream out = null;      
                File outFile = new File(outputPath);      
                if (!outFile.getParentFile().exists()) {      
                    outFile.getParentFile().mkdirs();      
                }      
                out = new FileOutputStream(outputPath);      
                // 保存为PNG      
                ChartUtilities.writeChartAsPNG(out, chart, weight, height);      
                // 保存为JPEG      
                // ChartUtilities.writeChartAsJPEG(out, chart, weight, height);      
                out.flush();      
                if (out != null) {      
                    try {      
                        out.close();      
                    } catch (IOException e) {      
                        // do nothing      
                    }      


            }      
        }