meter2.jsp

JFreeChart开发全攻略,JFreeChart开发全攻略

<%@ page contentType="text/html;charset=UTF-8"%>
<%@ page import="org.jfree.chart.JFreeChart,
                 org.jfree.chart.servlet.ServletUtilities,
                 java.awt.*,
                 org.jfree.data.general.DefaultValueDataset,
                 org.jfree.chart.plot.ThermometerPlot,
                 org.jfree.ui.RectangleInsets"%>
                 
<%
//设置数据集，20为指针初始指向的位置
DefaultValueDataset dataset = new DefaultValueDataset(40);

//根据数据集创建试管图图形对象
ThermometerPlot thermometerplot = new ThermometerPlot(dataset);
JFreeChart jfreechart = new JFreeChart(
					"试管图",
					JFreeChart.DEFAULT_TITLE_FONT,
					thermometerplot,
					true);
thermometerplot.setInsets(new RectangleInsets(5D, 5D, 5D, 5D));
thermometerplot.setPadding(new RectangleInsets(10D, 10D, 10D, 10D));
thermometerplot.setThermometerStroke(new BasicStroke(2.0F));
thermometerplot.setThermometerPaint(Color.lightGray);
thermometerplot.setUnits(1);

String filename = ServletUtilities.saveChartAsPNG(jfreechart, 400, 400, null, session);
String graphURL = request.getContextPath() + "/DisplayChart?filename=" + filename;
%>
<img src="<%= graphURL %>" width="400" height="400" border="0" usemap="#<%= filename %>">