chartaction.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 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.data.general.DefaultPieDataset;

/** 
 * MyEclipse Struts
 * Creation date: 04-11-2008
 * 
 * XDoclet definition:
 * @struts.action validate="true"
 * @struts.action-forward name="ok" path="/Chart.jsp"
 * @struts.action-forward name="fail" path="/fail.jsp"
 */
public class ChartAction 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) {
		// TODO Auto-generated method stub
		request.setAttribute("piedataset", getDataset());
		return mapping.findForward("ok");
	}

	private DefaultPieDataset getDataset() {
		// categories...    
		String[] section = new String[] { "Jan", "Feb", "Mar", "Apr", "May",
				"Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
		// data...    
		double[] data = new double[section.length];
		for (int i = 0; i < data.length; i++) {
			data[i] = 10 + (Math.random() * 10);
		}
		// create the dataset...    
		DefaultPieDataset dataset = new DefaultPieDataset();
		for (int i = 0; i < data.length; i++) {
			dataset.setValue(section[i], data[i]);
			System.out.println("section["+i+"]:"+section[i]+"   data["+i+"]:"+data[i]);
		}
		return dataset;
	}

}