jfreechart配置与应用

来源：互联网发布：pickit3.5软件下载编辑：程序博客网时间：2024/04/28 04:50

(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!