柱状图

Crying — Thu, 06 Dec 2007 06:40:00 GMT

1.JFreeReport ：报表解决工具
2.JFreeChart:Java 图形解决方案（Application/Applet/Servlet/Jsp）
3.JCommon ：JFreeReport和JFreeChart的公共类库
4.JFreeDesigner ：JFreeReport的报表设计工具
下载地址 http://www.jfree.org/jfreechart/index.html 解压将LIB下的jfreechart-1.0.6.jar 、jcommon-1.0.10.jar、gnujaxp.jar 放到项目中即可，如果加上第三个jar(gnujaxp.jar)包有时web.xml会报错，把它去掉就好了。

我的环境 tomcat 6.0 ,eclipse 3.2. mssql

<servlet>
    <servlet-name>DisplayChartservlet-name>
    <servlet-class>org.jfree.chart.servlet.DisplayChartservlet-class>
  servlet>

<servlet-mapping>
    <servlet-name>DisplayChartservlet-name>
    <url-pattern>/servlet/DisplayCharturl-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;

/**
* 处理柱状图
*
* @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中的制作柱状图类******* */

        DefaultCategoryDataset dataset = new DefaultCategoryDataset();

        /** 查找当年的请假每月的假期总数* */

        DbApplicationDAO dbApplicationDAO = new DbApplicationDAO();

        String flag = (String) request.getSession().getAttribute("flag");

        if ("manager".equals(flag)) {
            year = request.getParameter("year");
            // System.out.println("经理输入的年份是 "+ 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 + " 年假期统计", year
                + " 年假期统计", "天数",

        dataset, PlotOrientation.VERTICAL, // 选择水平或者垂直放

                true,// 是否显示颜色类别（地区）提示

                false,

                false);
        request.setAttribute("chart", chart);
        return mapping.findForward("go_category");
    }
}

显示柱状图的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>柱状图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>

Crying 2007-12-06 14:40 发表评论

饼状图

Crying — Thu, 06 Dec 2007 05:29:00 GMT

摘要: 1.JFreeReport ：报表解决工具 2.JFreeChart:Java 图形解决方案（Application/Applet/Servlet/Jsp） 3.JCommon ：JFreeReport和JFreeChart的公共类库 4.JFreeDesigner ：JFreeReport的报表设计工具下载地址 http://www.jfree.org/jfreechart/... 阅读全文

Crying 2007-12-06 13:29 发表评论

BlogJava-丄諦啲仇魜ヤ -文章分类-JreeChart使用

JfreeCahrt好多文章

柱状图

饼状图