JFreeChart實例詳解( very good) http://blog.csdn.net/softwave/archive/2005/11/15/529898.aspx
http://hi.baidu.com/injava/blog/item/b17f9bb1ca42ea5409230296.html
用JFreeChart增強JSP報表的用戶體驗 (特好 清晰)
http://www.aygfsteel.com/amigoxie/archive/2007/09/30/149765.html
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2.JFreeChart:Java 圖形解決方案（Application/Applet/Servlet/Jsp）
3.JCommon ：JFreeReport和JFreeChart的公共類庫
4.JFreeDesigner ：JFreeReport的報表設計工具
下載 地址 http://www.jfree.org/jfreechart/index.html 解壓將LIB下的jfreechart-1.0.6.jar 、jcommon-1.0.10.jar、gnujaxp.jar 放到項目中即可，如果加上第三個jar(gnujaxp.jar)包有時web.xml會報錯，把它去掉就好了。
我的環境 tomcat 6.0 ,eclipse 3.2. mssql
<servlet> <servlet-name>DisplayChart</servlet-name> <servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> </servlet> <servlet-mapping> <servlet-name>DisplayChart</servlet-name> <url-pattern>/servlet/DisplayChart</url-pattern> </servlet-mapping>
package com.report;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Iterator;import java.util.List;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.JFreeChart;import org.jfree.chart.plot.PlotOrientation;import org.jfree.data.category.DefaultCategoryDataset;import com.dao.DbApplicationDAO;
/**
* 處理柱狀圖 * * @version1.0 2007-11-3 * @author王世清
*/public class CategoryAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
HttpServletRequest request, HttpServletResponse response) String year = ""; /** ******JfreeChart中的制作柱狀圖類******* */ DefaultCategoryDataset dataset = new DefaultCategoryDataset(); /** 查找當年的請假每月的假期總數* */ DbApplicationDAO dbApplicationDAO = new DbApplicationDAO(); String flag = (String) request.getSession().getAttribute("flag"); if ("manager".equals(flag)) { year = request.getParameter("year"); // System.out.println("經理輸入的年份是 "+ year); } else { SimpleDateFormat sd = new SimpleDateFormat("yyyy"); Date date = new Date(); year = sd.format(date);
} List list = dbApplicationDAO.findAplicationByYear(year); Iterator i = list.iterator(); while (i.hasNext()) { Object[] row = (Object[]) i.next(); Integer days = (Integer) row[0]; String month = (String) row[1]; dataset.addValue(days, month + "月", month + "月"); } JFreeChart chart = ChartFactory.createBarChart3D(year + " 年假期統計", year + " 年假期統計", "天數", dataset, PlotOrientation.VERTICAL, // 選擇水平或者垂直放 true,// 是否顯示顏色類別（地區）提示 false, false); request.setAttribute("chart", chart); return mapping.findForward("go_category"); }}顯示柱狀圖的JSP
<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%><%@ page import="org.jfree.chart.JFreeChart,org.jfree.chart.servlet.ServletUtilities"%><HTML> <HEAD> <TITLE>柱狀圖</TITLE> </HEAD> <BODY bgcolor="#E0F0F8"> <% JFreeChart chart=(JFreeChart)request.getAttribute("chart"); String filename = ServletUtilities.saveChartAsPNG (chart, 600, 300, null, session); String graphURL = request.getContextPath () + "/servlet/DisplayChart?filename=" + filename; %> <center> <table> <tr valign="top" align="center"> <td> <%@ include file="header.jsp"%> </td> </tr> <tr> <td valign="middle" align="center"> <img src="<%= graphURL %>" width="500" height="300" border="0" usemap="#<%= filename %>" alt=""> </td> </tr> </table> </center> </BODY></HTML>]]>
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