初识JFreeChart

JFreeChart绘制图表的简单运用
1 绘制饼图

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;


public class PieChart {
	
	public static void main(String[] args){
		
		DefaultPieDataset dataSet=PieChart.getDaultDataSet();      //获取数据集
		
		@SuppressWarnings("unused")
/*
 * 
 *     绘制3D饼图:ChartFactory.createPieChart3D(String title,DefaultPieDataset dataSet, boolean legend,boolean tooltips,boolean urls);
 *     绘制 饼图:ChartFactory.createPieChar(String title,DefaultPieDataset dataSet, boolean legend,boolean tooltips,boolean urls);
 */
		JFreeChart pieChart=ChartFactory.createPieChart3D("家庭水果存量",dataSet,true,true,true);
		try {
			
/*			
 *          使用writeChartAsJPEG方法保存到文件
 *         ChartUtilities.writeChartAsJPEG(new FileOutputStream("D:/test.jpeg"), (float) 1.0, pieChart, 300, 300);
 */
			/*
			 * 使用saveChartAsJPEG方法保存到文件
			 */
			ChartUtilities.saveChartAsJPEG(new File("D:/test.jpeg"), pieChart, 300, 300);
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		
	}

	private static DefaultPieDataset getDaultDataSet() {
		// TODO Auto-generated method stub
		DefaultPieDataset dataSet=new DefaultPieDataset();
		dataSet.setValue("梨", 30);
		dataSet.setValue("苹果", 20);
		dataSet.setValue("香蕉",45);
		return dataSet;
		
	}
}

2 绘制条形图

import java.io.File;
import java.io.IOException;

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

public class BarChart {
	
	public static void main(String[] args) throws IOException{
		
		DefaultCategoryDataset dataSet=BarChart.getDataSet();
		
		/*
		 * 
		 * 平面条形图
		 * JFreeChart barChart=ChartFactory.createBarChart("家庭水果存量","水果类别","数量",dataSet,PlotOrientation.VERTICAL,true,false,false);
		 *                                                     
		 */
		
	  
		/*
		 * 
		 * 3D条形图
		 */
		 JFreeChart barChart=ChartFactory.createBarChart3D("家庭水果存量","水果类别","数量",dataSet,PlotOrientation.VERTICAL,true,false,false);
				                                                
			
		 ChartUtilities.saveChartAsJPEG(new File("D:/barchart2.jpeg"), barChart, 300, 300);
		
	}

	public static DefaultCategoryDataset getDataSet(){
		DefaultCategoryDataset dataSet=new DefaultCategoryDataset();
		
		@SuppressWarnings("unused")
		String[] dataName=new String[]{"梨" ,"苹果" ,"香蕉"};
	    int[] dataValue=new int[]{20,35,45};
		
	    for(int i=0;i<dataValue.length;i++){
	    	dataSet.addValue(dataValue[i], dataName[i], dataName[i]);
	    }
	    
	    
		return dataSet;
	}
}

3 绘制线形图

import java.io.File;
import java.io.IOException;

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

public class LineChart {
	
	public static void main(String[] args) throws IOException{
		
		DefaultCategoryDataset dataSet=LineChart.getDataSet();
		
		JFreeChart lineChart=ChartFactory.createLineChart("模拟考物理成绩", "广东模拟考试", "某生成绩", dataSet,PlotOrientation.VERTICAL, true, true, false);
	 
	
		ChartUtilities.saveChartAsJPEG(new File("D:/lineChart.jpeg"),lineChart,300,300);
	}
	
	public static DefaultCategoryDataset getDataSet(){
		
		DefaultCategoryDataset dataSet=new DefaultCategoryDataset();
		
		dataSet.addValue(60, "物理", "广1模");
		dataSet.addValue(30, "物理", "广2模");
		dataSet.addValue(45, "物理", "广3模");
		dataSet.addValue(70, "物理", "广4模");
		dataSet.addValue(74, "物理", "广5模");
		dataSet.addValue(90, "物理", "广6模");
		return dataSet;
		
	}
}