JFreeChart是JAVA平臺上的一個開放的圖表繪製類庫。它完全使用JAVA語言編寫,是爲applications, applets, servlets 以及JSP等使用所設計。下面我就詳細介紹如何使用jfreechart生成柱狀圖、折線圖、和餅狀圖。
步驟:
①、導入其相應的jcommon-1.0.16.jar和jfreechart-1.0.13.jar文件(可點擊下載)
②、下面就可以寫實現各種圖形的代碼了
A、生成柱狀圖:
<span style="font-size:18px;">package com.whp.test;
import java.awt.Font;
import java.io.File;
import java.io.IOException;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis3D;
import org.jfree.chart.axis.NumberAxis3D;
import org.jfree.chart.axis.NumberTickUnit;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.data.category.DefaultCategoryDataset;
public class jfreeChart {
public static void main(String[] args) {
// TODO Auto-generated method stub
DefaultCategoryDataset dataset=new DefaultCategoryDataset();
//添加數據
dataset.addValue(98, "數學", "張三");
dataset.addValue(87, "語文", "張三");
dataset.addValue(68, "數學", "李四");
dataset.addValue(89, "語文", "李四");
dataset.addValue(56, "數學", "王五");
dataset.addValue(96, "語文", "王五");
JFreeChart chart=ChartFactory.createBarChart3D(
"成績統計表",
"學生姓名",//X軸的標籤
"分數",//Y軸的標籤
dataset, //圖標顯示的數據集合
PlotOrientation.VERTICAL, //圖像的顯示形式(水平或者垂直)
true,//是否顯示子標題
true,//是否生成提示的標籤
true); //是否生成URL鏈接
//處理圖形上的亂碼
//處理主標題的亂碼
chart.getTitle().setFont(new Font("宋體",Font.BOLD,18));
//處理子標題亂碼
chart.getLegend().setItemFont(new Font("宋體",Font.BOLD,15));
//獲取圖表區域對象
CategoryPlot categoryPlot = (CategoryPlot)chart.getPlot();
//獲取X軸的對象
CategoryAxis3D categoryAxis3D = (CategoryAxis3D)categoryPlot.getDomainAxis();
//獲取Y軸的對象
NumberAxis3D numberAxis3D = (NumberAxis3D)categoryPlot.getRangeAxis();
//處理X軸上的亂碼
categoryAxis3D.setTickLabelFont(new Font("宋體",Font.BOLD,15));
//處理X軸外的亂碼
categoryAxis3D.setLabelFont(new Font("宋體",Font.BOLD,15));
//處理Y軸上的亂碼
numberAxis3D.setTickLabelFont(new Font("宋體",Font.BOLD,15));
//處理Y軸外的亂碼
numberAxis3D.setLabelFont(new Font("宋體",Font.BOLD,15));
//處理Y軸上顯示的刻度,以10作爲1格
numberAxis3D.setAutoTickUnitSelection(false);
NumberTickUnit unit = new NumberTickUnit(10);
numberAxis3D.setTickUnit(unit);
//獲取繪圖區域對象
BarRenderer3D barRenderer3D = (BarRenderer3D)categoryPlot.getRenderer();
//設置柱形圖的寬度
barRenderer3D.setMaximumBarWidth(0.07);
//在圖形上顯示數字
barRenderer3D.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
barRenderer3D.setBaseItemLabelsVisible(true);
barRenderer3D.setBaseItemLabelFont(new Font("宋體",Font.BOLD,15));
//在D盤目錄下生成圖片
File file = new File("chart.jpeg");
try {
ChartUtilities.saveChartAsJPEG(file, chart, 800, 600);
} catch (IOException e) {
e.printStackTrace();
}
//使用ChartFrame對象顯示圖像
ChartFrame frame = new ChartFrame("xyz",chart);
frame.setVisible(true);
frame.pack();
}
}
</span>
結果:
B、生成折線圖
package com.whp.test;
import java.awt.Font;
import java.awt.Rectangle;
import java.io.File;
import java.io.IOException;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryAxis3D;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberAxis3D;
import org.jfree.chart.axis.NumberTickUnit;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.data.category.DefaultCategoryDataset;
public class jfreeChart1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
// 添加數據
dataset.addValue(98, "數學", "張三");
dataset.addValue(68, "數學", "李四");
dataset.addValue(56, "數學", "王五");
JFreeChart chart = ChartFactory.createLineChart("用戶統計報表(所屬單位)", // 主標題的名稱
"所屬單位名稱",// X軸的標籤
"數量",// Y軸的標籤
dataset, // 圖標顯示的數據集合
PlotOrientation.VERTICAL, // 圖像的顯示形式(水平或者垂直)
true,// 是否顯示子標題
true,// 是否生成提示的標籤
true); // 是否生成URL鏈接
// 處理圖形上的亂碼
// 處理主標題的亂碼
chart.getTitle().setFont(new Font("宋體", Font.BOLD, 18));
// 處理子標題亂碼
chart.getLegend().setItemFont(new Font("宋體", Font.BOLD, 15));
// 獲取圖表區域對象
CategoryPlot categoryPlot = (CategoryPlot) chart.getPlot();
// 獲取X軸的對象
CategoryAxis categoryAxis = (CategoryAxis) categoryPlot.getDomainAxis();
// 獲取Y軸的對象
NumberAxis numberAxis = (NumberAxis) categoryPlot.getRangeAxis();
// 處理X軸上的亂碼
categoryAxis.setTickLabelFont(new Font("宋體", Font.BOLD, 15));
// 處理X軸外的亂碼
categoryAxis.setLabelFont(new Font("宋體", Font.BOLD, 15));
// 處理Y軸上的亂碼
numberAxis.setTickLabelFont(new Font("宋體", Font.BOLD, 15));
// 處理Y軸外的亂碼
numberAxis.setLabelFont(new Font("宋體", Font.BOLD, 15));
// 處理Y軸上顯示的刻度,以10作爲1格
numberAxis.setAutoTickUnitSelection(false);
NumberTickUnit unit = new NumberTickUnit(10);
numberAxis.setTickUnit(unit);
// 獲取繪圖區域對象
LineAndShapeRenderer lineAndShapeRenderer = (LineAndShapeRenderer) categoryPlot
.getRenderer();
// 在圖形上顯示數字
lineAndShapeRenderer
.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
lineAndShapeRenderer.setBaseItemLabelsVisible(true);
lineAndShapeRenderer
.setBaseItemLabelFont(new Font("宋體", Font.BOLD, 15));
// 在圖形上添加轉折點(使用小矩形顯示)
Rectangle shape = new Rectangle(10, 10);
lineAndShapeRenderer.setSeriesShape(0, shape);
lineAndShapeRenderer.setSeriesShapesVisible(0, true);
//在D盤目錄下生成圖片
File file = new File("chart1.jpg");
try {
ChartUtilities.saveChartAsJPEG(file, chart, 800, 600);
} catch (IOException e) {
e.printStackTrace();
}
// 使用ChartFrame對象顯示圖像
ChartFrame frame = new ChartFrame("xyz", chart);
frame.setVisible(true);
frame.pack();
}
}
結果:
C、生成餅圖:
package com.whp.test;
import java.awt.Font;
import java.awt.Rectangle;
import java.io.File;
import java.io.IOException;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryAxis3D;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberAxis3D;
import org.jfree.chart.axis.NumberTickUnit;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PiePlot3D;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
public class jfreeChart3 {
public static void main(String[] args) {
// TODO Auto-generated method stub
DefaultPieDataset dataset = new DefaultPieDataset();
//添加數據
dataset.setValue("張三",40);
dataset.setValue("李四",32);
dataset.setValue("王五",28);
JFreeChart chart = ChartFactory.createPieChart3D("比重統計報表(所屬單位)", //主標題的名稱
dataset, //圖標顯示的數據集合
true,//是否顯示子標題
true,//是否生成提示的標籤
true); //是否生成URL鏈接
//處理圖形上的亂碼
//處理主標題的亂碼
chart.getTitle().setFont(new Font("宋體",Font.BOLD,18));
//處理子標題亂碼
chart.getLegend().setItemFont(new Font("宋體",Font.BOLD,15));
//獲取圖表區域對象
PiePlot3D categoryPlot = (PiePlot3D)chart.getPlot();
//處理圖像上的亂碼
categoryPlot.setLabelFont(new Font("宋體",Font.BOLD,15));
//設置圖形的生成格式爲(上海 2 (10%))
String format = "{0} {1} ({2})";
categoryPlot.setLabelGenerator(new StandardPieSectionLabelGenerator(format));
//在D盤目錄下生成圖片
File file = new File("chart2.jpg");
try {
ChartUtilities.saveChartAsJPEG(file, chart, 800, 600);
} catch (IOException e) {
e.printStackTrace();
}
//使用ChartFrame對象顯示圖像
ChartFrame frame = new ChartFrame("xyz",chart);
frame.setVisible(true);
frame.pack();
}
}
結果: