range_plot_demo.java

JFreeChart开发全攻略,JFreeChart开发全攻略

package com.jfreechart;
import java.awt.Dimension;
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 javax.swing.JPanel;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.*;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.labels.StandardCategoryToolTipGenerator;
import org.jfree.chart.plot.*;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

public class Range_Plot_Demo extends ApplicationFrame
{

	public Range_Plot_Demo(String s)
	{
		super(s);
	}

	public static CategoryDataset createDataset1()
	{
		DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
		String s = "学杂费";
		String s1 = "生活费";
		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";
		defaultcategorydataset.addValue(2300D, 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(3000D, s1, s8);
		defaultcategorydataset.addValue(2000D, s1, s9);
		return defaultcategorydataset;
	}

	public static CategoryDataset createDataset2()
	{
		DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
		String s = "家庭来源";
		String s1 = "学校补助";
		String s2 = "北京";
		String s3 = "山东";
		String s4 = "吉林";
		String s5 = "天津";
		defaultcategorydataset.addValue(3000D, s, s2);
		defaultcategorydataset.addValue(4000D, s, s3);
		defaultcategorydataset.addValue(3000D, s, s4);
		defaultcategorydataset.addValue(5000D, s, s5);
		defaultcategorydataset.addValue(5000D, s1, s2);
		defaultcategorydataset.addValue(7000D, s1, s3);
		defaultcategorydataset.addValue(6000D, s1, s4);
		defaultcategorydataset.addValue(5000D, s1, s5);
		return defaultcategorydataset;
	}

	private static JFreeChart createChart()
	{
		//创建第一幅图
		CategoryDataset categorydataset = createDataset1();
		CategoryAxis categoryaxis = new CategoryAxis("广州学生");
		categoryaxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
		categoryaxis.setMaximumCategoryLabelWidthRatio(5F);
		LineAndShapeRenderer lineandshaperenderer = new LineAndShapeRenderer();
		lineandshaperenderer.setBaseToolTipGenerator(new StandardCategoryToolTipGenerator());
		CategoryPlot categoryplot = new CategoryPlot(categorydataset, categoryaxis, null, lineandshaperenderer);
		categoryplot.setDomainGridlinesVisible(true);
		//创建第二幅图
		CategoryDataset categorydataset1 = createDataset2();
		CategoryAxis categoryaxis1 = new CategoryAxis("北方学生");
		categoryaxis1.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
		categoryaxis1.setMaximumCategoryLabelWidthRatio(5F);
		BarRenderer barrenderer = new BarRenderer();
		barrenderer.setBaseToolTipGenerator(new StandardCategoryToolTipGenerator());
		CategoryPlot categoryplot1 = new CategoryPlot(categorydataset1, categoryaxis1, null, barrenderer);
		categoryplot1.setDomainGridlinesVisible(true);
		NumberAxis numberaxis = new NumberAxis("年生活消费(元)");
		CombinedRangeCategoryPlot combinedrangecategoryplot = new CombinedRangeCategoryPlot(numberaxis);
		combinedrangecategoryplot.add(categoryplot, 3);
		combinedrangecategoryplot.add(categoryplot1, 2);
		//设置图形水平或是垂直显示
		combinedrangecategoryplot.setOrientation(PlotOrientation.VERTICAL );
		JFreeChart jfreechart = new JFreeChart("学生生活收支对比图", new Font("SansSerif", 1, 12), combinedrangecategoryplot, 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);
	}
}