详解Java中如何使用JFreeChart生成甘特图

<dependency>
    <groupId>org.jfree</groupId>
    <artifactId>jfreechart</artifactId>
    <version>1.5.3</version> <!-- 使用最新版本 -->
</dependency>

import org.jfree.data.gantt.Task;
import org.jfree.data.gantt.GanttCategoryDataset;
import org.jfree.data.gantt.DefaultGanttCategoryDataset;
import java.util.Date;
 
public class GanttChartData {
    public GanttCategoryDataset createDataset() {
        DefaultGanttCategoryDataset dataset = new DefaultGanttCategoryDataset();
 
        // 创建任务
        Task task1 = new Task("Task 1", new Date(2023, 9, 1), new Date(2023, 9, 10));
        Task task2 = new Task("Task 2", new Date(2023, 9, 5), new Date(2023, 9, 15));
        Task task3 = new Task("Task 3", new Date(2023, 9, 10), new Date(2023, 9, 20));
 
        // 添加任务到数据集中
        dataset.add(task1, "Project A", "Task 1");
        dataset.add(task2, "Project A", "Task 2");
        dataset.add(task3, "Project A", "Task 3");
 
        return dataset;
    }
}

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import javax.swing.*;
import java.awt.*;
 
public class GanttChartExample extends JFrame {
    public GanttChartExample(String title) {
        super(title);
 
        // 创建数据集
        GanttCategoryDataset dataset = new GanttChartData().createDataset();
 
        // 创建甘特图
        JFreeChart chart = ChartFactory.createGanttChart(
                "Task Schedule",    // 图表标题
                "Task",             // 任务轴标签
                "Date",             // 时间轴标签
                dataset,            // 数据集
                true,               // 显示图例
                true,               // 显示工具提示
                false               // 不显示 URL
        );
 
        // 创建和设置图表面板
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new Dimension(800, 600));
        setContentPane(chartPanel);
    }
 
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            GanttChartExample example = new GanttChartExample("Gantt Chart Example");
            example.setSize(800, 600);
            example.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
            example.setVisible(true);
        });
    }
}

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.data.gantt.Task;
import org.jfree.data.gantt.GanttCategoryDataset;
import org.jfree.data.gantt.DefaultGanttCategoryDataset;
import org.jfree.ui.ApplicationFrame; // 注意：这里我们使用JFrame而不是ApplicationFrame
import javax.swing.*;
import java.awt.*;
import java.util.Date;

public class GanttChartData {
    public GanttCategoryDataset createDataset() {
        // ...（同上）
    }
}

public class GanttChartExample extends JFrame {
    // 构造函数（同上）
 
    public static void main(String[] args) {
        // ...（同上）
    }
}