category_plot_demo.java

JFreeChart开发全攻略,JFreeChart开发全攻略

package com.jfreechart;

import java.awt.Font;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.labels.StandardCategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.CombinedDomainCategoryPlot;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;

public class Category_Plot_Demo extends ApplicationFrame {
	
	String s2 = "伍英";
	String s3 = "李得";
	String s4 = "王冠";
	String s5 = "陈砂";
	String s6 = "刘行";
	String s7 = "谢放";
	String s8 = "李实";
	String s9 = "邓平";
	
	public Category_Plot_Demo(String s) {
		super(s);
	}

	public  CategoryDataset createDataset1() {
		DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
		String s = "家庭来源";
		String s1 = "学校补助";
		defaultcategorydataset.addValue(2000.0D, s, s2);
		defaultcategorydataset.addValue(4000D, s, s3);
		defaultcategorydataset.addValue(3000D, s, s4);
		defaultcategorydataset.addValue(5000D, s, s5);
		defaultcategorydataset.addValue(5000D, s, s6);
		defaultcategorydataset.addValue(7000D, s, s7);
		defaultcategorydataset.addValue(7000D, s, s8);
		defaultcategorydataset.addValue(8000D, s, s9);
		defaultcategorydataset.addValue(5000D, s1, s2);
		defaultcategorydataset.addValue(7000D, s1, s3);
		defaultcategorydataset.addValue(6000D, s1, s4);
		defaultcategorydataset.addValue(8000D, s1, s5);
		defaultcategorydataset.addValue(4000D, s1, s6);
		defaultcategorydataset.addValue(4000D, s1, s7);
		defaultcategorydataset.addValue(2000D, s1, s8);
		defaultcategorydataset.addValue(2000.0D, s1, s9);
		return defaultcategorydataset;
	}

	public  CategoryDataset createDataset2() {
		DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
		String s = "学杂费";
		String s1 = "生活费";

		defaultcategorydataset.addValue(3000D, s, s2);
		defaultcategorydataset.addValue(4000D, s, s3);
		defaultcategorydataset.addValue(6000D, s, s4);
		defaultcategorydataset.addValue(5000D, s, s5);
		defaultcategorydataset.addValue(5000D, s, s6);
		defaultcategorydataset.addValue(7000D, s, s7);
		defaultcategorydataset.addValue(7000D, s, s8);
		defaultcategorydataset.addValue(8000D, s, s9);
		defaultcategorydataset.addValue(8000D, s1, s2);
		defaultcategorydataset.addValue(7000D, s1, s3);
		defaultcategorydataset.addValue(6000D, s1, s4);
		defaultcategorydataset.addValue(8000D, s1, s5);
		defaultcategorydataset.addValue(7000D, s1, s6);
		defaultcategorydataset.addValue(5000D, s1, s7);
		defaultcategorydataset.addValue(4000D, s1, s8);
		defaultcategorydataset.addValue(3000D, s1, s9);
		return defaultcategorydataset;
	}

	private  JFreeChart createChart() {
		//绘制第一张对比图
		CategoryDataset categorydataset = createDataset1();
		NumberAxis numberaxis = new NumberAxis("年经济来源(元)");
		numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
		LineAndShapeRenderer lineandshaperenderer = new LineAndShapeRenderer();
		lineandshaperenderer.setBaseToolTipGenerator(new StandardCategoryToolTipGenerator());
		CategoryPlot categoryplot = new CategoryPlot(categorydataset, null,	numberaxis, lineandshaperenderer);
		categoryplot.setDomainGridlinesVisible(true);
		CategoryDataset categorydataset1 = createDataset2();
	
		//绘制第二张对比图
		NumberAxis numberaxis1 = new NumberAxis("年生活支出(元)");
		numberaxis1.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
		BarRenderer barrenderer = new BarRenderer();
		barrenderer.setBaseToolTipGenerator(new StandardCategoryToolTipGenerator());
		CategoryPlot categoryplot1 = new CategoryPlot(categorydataset1, null,numberaxis1, barrenderer);
		categoryplot1.setDomainGridlinesVisible(true);
		CategoryAxis categoryaxis = new CategoryAxis("学生");
		CombinedDomainCategoryPlot combineddomaincategoryplot = new CombinedDomainCategoryPlot(categoryaxis);
		combineddomaincategoryplot.add(categoryplot, 2);
		combineddomaincategoryplot.add(categoryplot1, 2);
		JFreeChart jfreechart = new JFreeChart("学生生活收支对比图", new Font("SansSerif", 1,12), combineddomaincategoryplot, true);
		return jfreechart;
	}


	public  void JfreeChart(HttpServletRequest request,HttpServletResponse response) throws IOException {
		Writer out = response.getWriter();
		HttpSession session = request.getSession();
		
		//获得图形对象
		JFreeChart chart = createChart();

		// 把生成的图片放到临时目录
		StandardEntityCollection sec = new StandardEntityCollection();
		ChartRenderingInfo info = new ChartRenderingInfo(sec);

		// 500是图片长度，300是图片高度，session 为HttpSession对象
		String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,info, session);
		
		//输出图片
		PrintWriter pw = new PrintWriter(out);
		ChartUtilities.writeImageMap(pw, "map0", info, false);
		
		String graphURL = request.getContextPath()
				+ "/DisplayChart?filename=" + filename;
		request.setAttribute("graphURL", graphURL);
	}
}