piebystrutsaction.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.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

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

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.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;

/** 
 * MyEclipse Struts
 * Creation date: 04-11-2008
 * 
 * XDoclet definition:
 * @struts.action scope="request" validate="true"
 * @struts.action-forward name="success" path="/MyJsp.jsp"
 * @struts.action-forward name="fail" path="/fail.jsp"
 */
public class PieByStrutsAction extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		response.setContentType("image/jpeg");
		PieDataset dataset = getDataSet();
		JFreeChart chart = ChartFactory.createPieChart3D(" 水果饼图", // chart title    
				dataset,// data    
				true, // include legend    
				true, false);
		//设置图表属性   
		//写图表对象到文件，参照柱状图生成源码
		//========================================================
		OutputStream out = null;
		try {
				out = new BufferedOutputStream(new FileOutputStream("F:\\水果饼图.jpg"));
				ChartUtilities.writeChartAsJPEG(out,1.0f,chart,400,300,null);
				System.out.println("图表生成完毕!");
		} catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}finally {
			try {
				out.close();
			} catch (Exception e) {}
		}		
		//========================================================
		// 输出图片    
		try {
			ChartUtilities.writeChartAsJPEG(response.getOutputStream(), 1.0f,chart, 800, 600, null);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	private static PieDataset getDataSet() {
		DefaultPieDataset dataset = new DefaultPieDataset();
		dataset.setValue(" 市场前期", new Double(10));
		dataset.setValue(" 立项", new Double(15));
		dataset.setValue(" 计划", new Double(10));
		dataset.setValue(" 需求与设计", new Double(10));
		dataset.setValue(" 执行控制", new Double(35));
		dataset.setValue(" 收尾", new Double(10));
		dataset.setValue(" 运维", new Double(10));
		return dataset;
	}

}