cewolfdataset.jsp

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<!--
	Fig. 8.4_02: CewolfDataset.jsp
	功能: 生成 DefaultCategoryDataset 数据集对象
-->
<%@ page contentType="text/html;charset=GB2312"%>
<%@ taglib uri='/WEB-INF/cewolf.tld' prefix='cewolf' %>

<%@ page import="java.util.*"%>

<%@ page import="de.laures.cewolf.*"%>
<%@ page import="de.laures.cewolf.tooltips.*"%>
<%@ page import="de.laures.cewolf.links.*"%>

<%@ page import="org.jfree.data.*"%>
<%@ page import="org.jfree.data.time.*"%>
<%@ page import="org.jfree.data.gantt.*"%>
<%@ page import="org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.plot.*"%>
<%@ page import="org.jfree.chart.renderer.*"%>
<%@ page import="org.jfree.data.category.*"%>
<%@ page import="org.jfree.data.general.*"%>
<%@ page import="org.jfree.data.xy.*"%>

<%!
	String bookTitle[] = {"Python", "JAVA", "C#", "Perl", "PHP"};
	String category[] = {"第1周", "第2周", "第3周", "第4周" };
	String xaxislabel = "销售时间:2005年4月";
	String yaxislabel = "销售量";
%>

<%
// 创建数据集
DatasetProducer categoryData = new DatasetProducer()
{
  public Object produceDataset(Map params)
  {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    int bookSales;
    for (int i = 0; i < bookTitle.length; i++)
    {
      for (int j = 0; j < category.length; j++)
      {
        bookSales = 50+(int)(Math.random() * 50);
        dataset.addValue(bookSales, bookTitle[i], category[j]);
      }
    }
    return dataset;
  }

  public String getProducerId()
  {
    return "CategoryDataProducer";
  }

  public boolean hasExpired(Map params, Date since)
  {
    return false;
  }
};
pageContext.setAttribute("categoryData", categoryData);
%>

<!--
/**************************************************************************
 * (C) Copyright 2004-2005 by Jingkui Zhong(钟京馗) and Huan Tang(唐桓).  *
 * All Rights Reserved.                                                   *
 *                                                                        *
 * DISCLAIMER: The authors of this code have used their                   *
 * best efforts in preparing the code. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these codes. The authors *
 * shall not be liable in any event for incidental or consequential       *
 * damages in connection with, or arising out of, the furnishing,         *
 * performance, or use of these programs.                                 *
 **************************************************************************/
 -->