graphaction.java

jfreechart不错的教程例子谢谢!

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.segsec.chart.struts.action;

import java.awt.Color;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;

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

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
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.servlet.ServletUtilities;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;

public class GraphAction extends Action {
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		//drawChartPicture dcp = new drawChartPicture();
		//GraphLogic gl = new GraphLogic();
		//gl.setChartInfo(request, response);
		//String img = dcp.getDrawChartInfo(request, response);

		HttpSession session = request.getSession();
		double[][] data = new double[][] { { 672, 766, 223, 540, 126 },
				{ 325, 521, 210, 340, 106 }, { 332, 256, 523, 240, 526 } };
		String[] rowKeys = { "苹果", "梨子", "葡萄" };
		String[] columnKeys = { "北京", "上海", "广州", "成都", "深圳" };
		CategoryDataset dataset = DatasetUtilities.createCategoryDataset(
				rowKeys, columnKeys, data);
		JFreeChart chart = ChartFactory.createBarChart3D("水果销量图统计", null, null,
				dataset, PlotOrientation.VERTICAL, true, false, false);
		chart.setBackgroundPaint(Color.WHITE);
		CategoryPlot plot = chart.getCategoryPlot();
		CategoryAxis domainAxis = plot.getDomainAxis();
		//domainAxis.setVerticalCategoryLabels(false);
		plot.setDomainAxis(domainAxis);
		ValueAxis rangeAxis = plot.getRangeAxis();
		//设置最高的一个 Item 与图片顶端的距离
		rangeAxis.setUpperMargin(0.15);
		//设置最低的一个 Item 与图片底端的距离
		rangeAxis.setLowerMargin(0.15);
		plot.setRangeAxis(rangeAxis);
		BarRenderer3D renderer = new BarRenderer3D();
		renderer.setBaseOutlinePaint(Color.BLACK);
		//设置 Wall 的颜色<BR>
		renderer.setWallPaint(Color.gray);
		//设置每种水果代表的柱的颜色
		renderer.setSeriesPaint(0, new Color(0, 0, 255));
		renderer.setSeriesPaint(1, new Color(0, 100, 255));
		renderer.setSeriesPaint(2, Color.GREEN);
		//设置每个地区所包含的平行柱的之间距离
		renderer.setItemMargin(0.1);
		//显示每个柱的数值，并修改该数值的字体属性<BR>
		renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());
		renderer.setItemLabelsVisible(true);
		plot.setRenderer(renderer);
		//设置柱的透明度<BR>
		plot.setForegroundAlpha(0.6f);
		//设置地区、销量的显示位置<BR>
		plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);
		plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);

        OutputStream out = new BufferedOutputStream(new FileOutputStream("F:\\项目状态分布1.jpg"));
        try {
            ChartUtilities.writeChartAsPNG(out, chart, 640, 480, null);
        }
        finally {
            out.close();
        }		
		
		FileOutputStream fos_jpg = null;
		try {
			System.out.println("开始生成图表!");
			
			fos_jpg = new FileOutputStream("F:\\项目状态分布2.jpg");
			
			ChartUtilities.writeChartAsJPEG(fos_jpg,1.0f, chart, 640, 480, null);
			//ChartUtilities.writeChartAsJPEG(fos_jpg,chart, 640, 480, null);
			System.out.println("图表生成完毕!");
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			try {
				fos_jpg.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		
		
		String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,null, session);

		String graphURL = request.getContextPath() + "/DisplayChart?filename="+ filename;
		System.out.println("graphURL:"+graphURL);
		System.out.println("filename.length():"+filename.length());
		if (filename.length() != 0) {
			System.out.println("graphname:"+filename);
			request.setAttribute("graphname", filename);
			System.out.println("graphURL:"+graphURL);
			request.setAttribute("graphURL", graphURL);
			return mapping.findForward("success");
		} else {
			return mapping.findForward("fail");
		}
	}
}