jline.jsp

提供 精通Java Web动态图表编程 一书的源代码, 大家赶快下载呀

<!--
	Fig. 8.2_11: jBasicLine.jsp
	功能: JFreeChart实例11: 自定义线段图
-->
<%@ page language="java" contentType="image/png;charset=GB2312"
	import="java.awt.*"
	import="org.jfree.chart.*"
	import="org.jfree.chart.servlet.*"
	import="org.jfree.chart.plot.*"
	import="org.jfree.chart.renderer.*"
	import="org.jfree.chart.entity.*"
	import="org.jfree.chart.title.*"
	import="org.jfree.chart.axis.*"
	import="org.jfree.chart.renderer.category.LineAndShapeRenderer"
	import="org.jfree.data.*"
	import="org.jfree.data.general.*"
	import="org.jfree.data.category.*"
	import="org.jfree.ui.*"
	import="org.jfree.util.*"
%>
<%!
    
	String bookTitle[] = {"Python", "JAVA", "C#", "Perl", "PHP"};
	String category[] = {"第1周", "第2周", "第3周", "第4周" };
	double bookSales;
	String chartTitle = "JFreeChart实例11: 自定义线段图";

	// 创建数据集
	public CategoryDataset createDataset() 
	{        
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        for (int i=0; i < bookTitle.length; i++)
		{
			for (int j=0; j < category.length; j++ )
			{
				bookSales = 1 +  (Math.random() * 100);
				dataset.addValue(bookSales, bookTitle[i], category[j]);
			}
		}
        return dataset;        
    }

	public JFreeChart createChart(CategoryDataset dataset)
	{
		// 创建图表对象
		JFreeChart chart = ChartFactory.createLineChart
		(
			chartTitle,					// 图表标题
			"销售时间:2005年2月",		// 坐标标题
			"销售量",                  // 坐标标题
			dataset,                  // 定义绘制数据
			PlotOrientation.VERTICAL, // 直方图的方向
			true,                     // 定义图表是否包含图例
			true,                     // 定义图表是否包含提示
			false                     // 定义图表是否包含URL
		 );
		 return chart;
	}
%>
<%
		// 创建一个 500X375 的图像
		int width=500, height=375;		

        CategoryDataset dataset = createDataset();
        JFreeChart chart = createChart(dataset);


        // 开始自定义图表绘制的相关属性
		
        // 设置图表的背景颜色
        chart.setBackgroundPaint(new Color(205, 241, 197));

		// 自定义图表的标题的字体和颜色
		TextTitle title = chart.getTitle();
		title.setFont(new Font("汉真广标", Font.BOLD, 25));

        // 获得图表对象的引用，用于设置更多的自定义绘制属性
        CategoryPlot plot = (CategoryPlot) chart.getPlot();
        GradientPaint bg = new GradientPaint(0, 50, new Color(248, 253, 255), 
				0, 250, new Color(205, 237, 252));
        plot.setBackgroundPaint(bg); 
        plot.setDomainGridlinePaint(Color.BLACK);
        plot.setDomainGridlinesVisible(true);
        plot.setRangeGridlinePaint(Color.RED);
      
        // 设置横轴标题的字体
		CategoryAxis domainAxis = plot.getDomainAxis();
		domainAxis.setLabelFont(new Font("黑体", Font.BOLD, 15));
		
        // 设置纵轴标题文字的字体及其旋转方向
		ValueAxis rangeAxis = plot.getRangeAxis();
		rangeAxis.setLabelFont(new Font("黑体", Font.BOLD, 15));
		rangeAxis.setLabelAngle(Math.PI/2);
	
		// 自定义图例的显示风格
		StandardLegend legend = (StandardLegend) chart.getLegend();
        legend.setDisplaySeriesShapes(true);
        legend.setShapeScaleX(1.5);
        legend.setShapeScaleY(1.5);
        legend.setDisplaySeriesLines(true);

        // 获取渲染对象
        LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot.getRenderer();
		
		// 自定义线段的绘制颜色
		Color color[] = new Color[bookTitle.length];
		color[0] = new Color(99,99,0);
		color[1] = new Color(255,169,66);
		color[2] = new Color(33,255, 66);
		color[3] = new Color(33,0,255);
		color[4] = new Color(255,0,66);
		for (int i = 0; i < color.length; i++)
		{
			renderer.setSeriesPaint(i, color[i]);
		}

		// 自定义线段的绘制风格
		BasicStroke bs ;
		for (int i = 0; i < bookTitle.length; i++)
		{
			float dashes[] = {10.0f};
			bs = new BasicStroke(2.0f, BasicStroke.CAP_ROUND, 
						BasicStroke.JOIN_ROUND, 10.f, dashes, 0.0f);
			if (i % 2 != 0)
				renderer.setSeriesStroke(i, bs);
			else
				renderer.setSeriesStroke(i, new BasicStroke(2.0f));
		}
      
		// 结束自定义图表绘制的相关属性
		
		ChartRenderingInfo info = 
				   new ChartRenderingInfo(new StandardEntityCollection());

		// 设置图片生成格式
        String fileName = 
		   ServletUtilities.saveChartAsPNG(chart, width, height, info, session);
	
        // 设置图片生成路径
		String graphURL = 
		   request.getContextPath() + "/servlet/DisplayChart?filename=" + fileName; 

%>
<HTML>
 <HEAD>
       <TITLE><%=chartTitle%></TITLE>
 </HEAD>
 <BODY>
       <P ALIGN="CENTER">
       <img src="<%=graphURL %>" border="1" >
       </P>
 </BODY>
</HTML>

<%
/**************************************************************************
 * (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.                                 *
 **************************************************************************/
 %>