Java实现折线图

java 如何实现折线图

1:在maven中找到并导入jar 包
maven:添加链接描述

在这里插入图片描述

编写相应的代码(以图书馆访问者统计器实现)

package com.mycompany.libraryvisitor;/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */


import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;

import javax.swing.table.DefaultTableModel;

/**
 *
 * @author weizhijie
 */
public class VisitorForm extends javax.swing.JFrame {

    /**
     *创建
     */
    public VisitorForm() {
        initComponents();
    }

 
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        tablevisitor = new javax.swing.JTable();
        DisiplayButton = new javax.swing.JButton();
        panelchart = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        tablevisitor.setModel(new DefaultTableModel(
                new Object [][] {
                        {null, null},
                        {null, null},
                        {null, null},
                        {null, null}
                },
                new String [] {
                        "年份", "访问"
                }
        ));
        jScrollPane1.setViewportView(tablevisitor);

        DisiplayButton.setText("显示统计数据");
        DisiplayButton.addActionListener(new java.awt.event.ActionListener() {
            @Override
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                DisiplayButtonActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout panelchartLayout = new javax.swing.GroupLayout(panelchart);
        panelchart.setLayout(panelchartLayout);
        panelchartLayout.setHorizontalGroup(
                panelchartLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGap(0, 432, Short.MAX_VALUE)
        );
        panelchartLayout.setVerticalGroup(
                panelchartLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGap(0, 225, Short.MAX_VALUE)
        );

        jLabel1.setFont(new java.awt.Font("宋体", 1, 18)); // NOI18N
        jLabel1.setText("图书馆访问者统计器");

        jLabel2.setText("-----------------------------------------------------------------------");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                        .addGroup(layout.createSequentialGroup()
                                                .addContainerGap()
                                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                                        .addGroup(layout.createSequentialGroup()
                                                                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 200, javax.swing.GroupLayout.PREFERRED_SIZE)
                                                                .addGap(43, 43, 43)
                                                                .addComponent(panelchart, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                                                        .addGroup(layout.createSequentialGroup()
                                                                .addGap(11, 11, 11)
                                                                .addComponent(DisiplayButton, javax.swing.GroupLayout.PREFERRED_SIZE, 180, javax.swing.GroupLayout.PREFERRED_SIZE))))
                                        .addGroup(layout.createSequentialGroup()
                                                .addGap(34, 34, 34)
                                                .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 521, javax.swing.GroupLayout.PREFERRED_SIZE)))
                                .addContainerGap(25, Short.MAX_VALUE))
                        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addGap(0, 0, Short.MAX_VALUE)
                                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 190, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(233, 233, 233))
        );
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                                .addContainerGap()
                                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 68, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 53, Short.MAX_VALUE)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                        .addGroup(layout.createSequentialGroup()
                                                .addComponent(panelchart, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                                .addGap(36, 36, 36)
                                                .addComponent(DisiplayButton, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE))
                                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 225, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addGap(26, 26, 26))
        );

        pack();
    }// </editor-fold>

    private void DisiplayButtonActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        //二维数组实现数据导入
        Integer[][]visitordata = {{2004,1500},{2005,1450},{2006,2000},{2007,2050},{2008,2500},{2009,2000},{2010,1600},{2011,3000},{2012,3200},{2013,4000},{2014,3500},{2015,2000},{2016,2300}};
        String[] title = {"年份","访问人数"};
        DefaultTableModel model = new DefaultTableModel();
        model.setDataVector(visitordata, title);
        tablevisitor.setModel(model);
        DefaultCategoryDataset chart_dataset = new DefaultCategoryDataset();
        for(int i = 0; i < 12;i++)
       {
            chart_dataset.addValue(visitordata[i][1],"图书馆访问人员统计表?",visitordata[i][0]);
        }
        JFreeChart lineChart = ChartFactory.createLineChart("图书馆人员统计表","标题","人数",chart_dataset, PlotOrientation.VERTICAL,true,true,false);
        ChartPanel chartpanel = new ChartPanel(lineChart);
        chartpanel.setSize(panelchart.getSize());
        panelchart.removeAll();
        panelchart.add(chartpanel);
        panelchart.validate();

    }


    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(VisitorForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(VisitorForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(VisitorForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(VisitorForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new VisitorForm().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton DisiplayButton;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JPanel panelchart;
    private javax.swing.JTable tablevisitor;
    // End of variables declaration
}

运行结果
在这里插入图片描述

### Java 实现折线图的方式 #### 使用 AWT/Swing 绘制折线图 通过 `Swing` 和 `AWT` 的绘图功能可以直接在图形界面中绘制折线图。这种方式适合于简单场景下的自定义绘图需求。 以下是基于 `Swing` 的一个基础示例: ```java import javax.swing.*; import java.awt.*; public class SimpleLineChart extends JPanel { private int[] xPoints = {50, 100, 150, 200, 250}; private int[] yPoints = {100, 75, 50, 75, 100}; @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; // 设置线条颜色 g2d.setColor(Color.BLUE); // 连接点形成折线 for (int i = 0; i < xPoints.length - 1; i++) { g2d.drawLine(xPoints[i], yPoints[i], xPoints[i + 1], yPoints[i + 1]); } // 可选:标记坐标点 g2d.setColor(Color.RED); for (int i = 0; i < xPoints.length; i++) { g2d.fillOval(xPoints[i] - 2, yPoints[i] - 2, 4, 4); } } public static void main(String[] args) { JFrame frame = new JFrame("Simple Line Chart"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(300, 200); frame.add(new SimpleLineChart()); frame.setVisible(true); } } ``` 此代码展示了如何使用 `Swing` 来绘制一条简单的折线图[^1]。 --- #### 使用 JFreeChart 库实现折线图 对于更复杂的数据可视化需求,推荐使用第三方库 `JFreeChart`。该库提供了丰富的图表类型支持,包括折线图、柱状图、饼图等。 ##### 步骤说明: 1. **引入依赖** 如果使用 Maven 构建工具,则需在 `pom.xml` 文件中添加以下依赖项: ```xml <dependency> <groupId>org.jfree</groupId> <artifactId>jfreechart</artifactId> <version>1.5.3</version> </dependency> ``` 2. **创建数据集并生成图表** 下面是一个完整的示例代码: ```java import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import javax.swing.*; public class JFreeChartExample { public static void createAndDisplayChart() { XYSeries series = new XYSeries("Sample Data"); series.add(1, 5); series.add(2, 7); series.add(3, 3); series.add(4, 8); series.add(5, 6); XYSeriesCollection dataset = new XYSeriesCollection(); dataset.addSeries(series); JFreeChart chart = ChartFactory.createXYLineChart( "折线图示例", // 图表标题 "X 轴标签", // X轴名称 "Y 轴标签", // Y轴名称 dataset // 数据集 ); ChartPanel panel = new ChartPanel(chart); JFrame frame = new JFrame("JFreeChart 折线图示例"); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.add(panel); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(JFreeChartExample::createAndDisplayChart); } } ``` 这段代码演示了如何利用 `JFreeChart` 创建一个带有交互性的折线图窗口[^4]。 --- #### Android 平台上的 MPAndroidChart 实现 如果目标平台是 Android,建议采用 `MPAndroidChart` 库来快速构建高质量的折线图。 ##### 主要步骤: 1. **配置 Gradle 依赖** 在模块级别的 `build.gradle` 文件中加入以下内容: ```gradle implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0' ``` 2. **XML 布局文件设置** 定义一个 `LineChart` 控件用于显示图表: ```xml <com.github.mikephil.charting.charts.LineChart android:id="@+id/lineChart" android:layout_width="match_parent" android:layout_height="wrap_content"/> ``` 3. **初始化数据并绑定到控件** 示例代码如下: ```java import com.github.mikephil.charting.charts.LineChart; import com.github.mikephil.charting.data.Entry; import com.github.mikephil.charting.data.LineData; import com.github.mikephil.charting.data.LineDataSet; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LineChart lineChart = findViewById(R.id.lineChart); ArrayList<Entry> entries = new ArrayList<>(); entries.add(new Entry(0f, 4)); entries.add(new Entry(1f, 2)); entries.add(new Entry(2f, 6)); entries.add(new Entry(3f, 8)); entries.add(new Entry(4f, 5)); LineDataSet dataSet = new LineDataSet(entries, "样本数据"); LineData data = new LineData(dataSet); lineChart.setData(data); lineChart.invalidate(); // 刷新图表 } } ``` 以上代码片段实现了在 Android 设备上动态加载和渲染折线图的功能[^3]。 --- ### 总结 根据不同应用场景可以选择合适的方案: - 对于桌面应用程序中的轻量级绘图任务,可直接借助 `Swing/AWT`; - 若追求更高灵活性与美观度,推荐集成成熟的开源框架如 `JFreeChart`; - 针对移动设备端开发,优先考虑专门为 Android 打造的高性能图表组件——`MPAndroidChart`。
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