1.JFreeReport ：報表解決工具
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(shè)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(huán)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) {
String year = "";
/** *//** ******JfreeChart中的制作柱狀圖類******* */
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
/** *//** 查找當(dāng)年的請假每月的假期總數(shù)* */
DbApplicationDAO dbApplicationDAO = new DbApplicationDAO();
String flag = (String) request.getSession().getAttribute("flag");
if ("manager".equals(flag)) {
year = request.getParameter("year");
// System.out.println("經(jīng)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(tǒng)計", year
+ " 年假期統(tǒng)計", "天數(shù)",
dataset, PlotOrientation.VERTICAL, // 選擇水平或者垂直放
true,// 是否顯示顏色類別（地區(qū)）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>
posted on 2007-12-06 14:40
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JreeChart使用