(1)
下载jfreechar获取jar包
(2)
将下载的zip解压,获取文件夹中lib中的*.jar包
(3)
将*.jar导入到你建的WEB工程中去,也就是lib目录下;
(4)
更改web.xml的配置
<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>
(5)
以饼状图为例:
在你的jsp页面中录入一下代码:
<%@ page contentType="text/html;charset=GBK"%><%@ page import="org.jfree.data.general.DefaultPieDataset"%><%@ page import="org.jfree.chart.JFreeChart"%><%@ page import="org.jfree.chart.plot.PiePlot"%><%@ page import="org.jfree.chart.ChartRenderingInfo"%><%@ page import="org.jfree.chart.servlet.ServletUtilities"%><%@ page import="org.jfree.chart.urls.StandardPieURLGenerator"%><%@ page import="org.jfree.chart.entity.StandardEntityCollection"%><%@ page import="org.jfree.chart.encoders.SunPNGEncoderAdapter"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <% DefaultPieDataset data = new DefaultPieDataset(); data.setValue("一月", 800); data.setValue("二月", 1200); data.setValue("三月", 3562); data.setValue("四月", 20); data.setValue("五月", 2569); data.setValue("六月", 1052); PiePlot plot = new PiePlot(data); JFreeChart chart = new JFreeChart("", JFreeChart.DEFAULT_TITLE_FONT, plot, true); chart.setBackgroundPaint(java.awt.Color.white); //可选,设置图片背景色 chart.setTitle("上半年工作完成状况"); //可选,设置图片标题 ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection()); //500是图片长度,300是图片高度 String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, info, session); String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename; %><HTML><HEAD> <TITLE>Welcome to Jfreechart !</TITLE></HEAD><BODY><P ALIGN="CENTER"><img src="<%= graphURL %>" width=500 height=300 border=0 usemap="#<%= filename %>"></P></BODY></HTML>
(6)
部署到Tomcat上,运行就可以了!