itemlabeldemo1.java

能使报表生成图像的大全代码

// Decompiled by Jad v1.5.8g. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.kpdus.com/jad.html
// Decompiler options: packimports(3) 

package demo.servlet;

import java.io.IOException;

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

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.text.NumberFormat;

import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.labels.AbstractCategoryItemLabelGenerator;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
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 ItemLabelDemo1  extends HttpServlet {
	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {
		this.doPost(request, response);
	}
	static class LabelGenerator extends AbstractCategoryItemLabelGenerator
			implements CategoryItemLabelGenerator {

		public String generateLabel(CategoryDataset categorydataset, int i,
				int j) {
			String s = null;
			Number number = categorydataset.getValue(i, j);
			if (number != null) {
				double d = number.doubleValue();
				if (d > threshold)
					s = number.toString();
			}
			return s;
		}

		private double threshold;

		public LabelGenerator(double d) {
			super("", NumberFormat.getInstance());
			threshold = d;
		}
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {
		
		DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();
		defaultcategorydataset.addValue(11D, "S1", "C1");
		defaultcategorydataset.addValue(44.299999999999997D, "S1", "C2");
		defaultcategorydataset.addValue(93D, "S1", "C3");
		defaultcategorydataset.addValue(35.600000000000001D, "S1", "C4");
		defaultcategorydataset.addValue(75.099999999999994D, "S1", "C5");
		
		CategoryDataset categorydataset = defaultcategorydataset;
		JFreeChart jfreechart = createChart(categorydataset);
	

		HttpSession session = request.getSession();

		String filename = ServletUtilities.saveChartAsPNG(jfreechart, 900,
				350, null, session);
		
		String graphURL = request.getContextPath()
		+ "/servlet/DisplayChart?filename=" + filename;
		
		request.setAttribute("filename", filename);
		request.setAttribute("graphURL", graphURL);
		
		System.out.println(filename + "<-->" + graphURL);
		this.getServletContext().getRequestDispatcher("/ItemLabelDemo1.jsp")
				.forward(request, response);
		
	}



	private static JFreeChart createChart(CategoryDataset categorydataset) {
		JFreeChart jfreechart = ChartFactory.createBarChart(
				"Item Label Demo 1", "Category", "Value", categorydataset,
				PlotOrientation.VERTICAL, false, true, false);
		jfreechart.setBackgroundPaint(Color.white);
		CategoryPlot categoryplot = jfreechart.getCategoryPlot();
		categoryplot.setBackgroundPaint(Color.lightGray);
		categoryplot.setDomainGridlinePaint(Color.white);
		categoryplot.setRangeGridlinePaint(Color.white);
		NumberAxis numberaxis = (NumberAxis) categoryplot.getRangeAxis();
		numberaxis.setUpperMargin(0.14999999999999999D);
		CategoryItemRenderer categoryitemrenderer = categoryplot.getRenderer();
		categoryitemrenderer.setItemLabelGenerator(new LabelGenerator(50D));
		categoryitemrenderer.setItemLabelFont(new Font("Serif", 0, 20));
		categoryitemrenderer.setItemLabelsVisible(true);
		return jfreechart;
	}




	
	
}