JFreeChart使用ChartFactory中文乱码

中文的地方显示为正方形图形

package jfreechart.barchart;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.StandardChartTheme;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.block.BlockBorder;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;

import java.awt.*;


public class BarChartDemo1 extends ApplicationFrame {
          
   

    public BarChartDemo1(String title) {
          
   
        super(title);

        CategoryDataset dataset = createDataset();
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart, false);
        chartPanel.setFillZoomRectangle(true);
        chartPanel.setMouseWheelEnabled(true);
        chartPanel.setPreferredSize(new Dimension(500, 270));
        setContentPane(chartPanel);
    }

    /**
     * Returns a sample dataset.
     *
     * @return The dataset.
     */
    private static CategoryDataset createDataset() {
          
   
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();

        dataset.addValue(7445, "JFreeSVG", "Warm-up");
        dataset.addValue(24448, "Batik", "Warm-up");
        dataset.addValue(4297, "JFreeSVG", "Test");
        dataset.addValue(21022, "Batik", "Test");
        return dataset;
    }

    /**
     * Creates a sample chart.
     *
     * @param dataset the dataset.
     * @return The chart.
     */
    private static JFreeChart createChart(CategoryDataset dataset) {
          
   

        JFreeChart chart = ChartFactory.createBarChart("投资占比", "股票分类" /* x-axis label*/,
                "所占比重" /* y-axis label */, dataset, PlotOrientation.VERTICAL, true, true, false);
        
        chart.setBackgroundPaint(Color.WHITE);
        CategoryPlot plot = (CategoryPlot) chart.getPlot();

        NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        BarRenderer renderer = (BarRenderer) plot.getRenderer();
        renderer.setDrawBarOutline(false);
        chart.getLegend().setFrame(BlockBorder.NONE);
        return chart;
    }

    public static void main(String[] args) {
          
   
        BarChartDemo1 demo = new BarChartDemo1("JFreeChart: BarChartDemo1.java");
        demo.pack();
        demo.setLocationRelativeTo(null);// 居中显示
        demo.setVisible(true);
    }

}

解决：在使用ChartFactory前设置字体

//创建主题样式，避免中文乱码
        StandardChartTheme standardChartTheme = new StandardChartTheme("CN");
        // 设置标题字体
        standardChartTheme.setExtraLargeFont(new Font("宋体", Font.BOLD, 20));
        // 设置图例的字体
        standardChartTheme.setRegularFont(new Font("宋体", Font.PLAIN, 15));
        // 设置轴向的字体
        standardChartTheme.setLargeFont(new Font("宋体", Font.PLAIN, 15));
        // 应用主题样式
        ChartFactory.setChartTheme(standardChartTheme);