把圖表數據顯示的jsp中.
首先我們建一個Servlet:
package com;
import java.awt.Color;
import java.io.File;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.StandardPieToolTipGenerator;
import org.jfree.chart.plot.PiePlot3D;
import org.jfree.chart.urls.StandardPieURLGenerator;
import org.jfree.data.general.DefaultPieDataset;
/** *//**
*
* @author zdw
*
*/
@SuppressWarnings("serial")
public class ChartServlet extends HttpServlet
{
public ChartServlet()
{
super();
}
public void init() throws ServletException
{
}
private void createPieChart(String path) throws IOException
{
// 餅圖數據源
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("中國", 44.4);
dataset.setValue("美國", 25.5);
dataset.setValue("日本", 18.5);
dataset.setValue("剛果", 4.6);
dataset.setValue("英國", 5.5);
dataset.setValue("其他", 0.5);
// 生成3D餅圖
PiePlot3D plot = new PiePlot3D(dataset);
plot.setToolTipGenerator(new StandardPieToolTipGenerator());
// 設置圖片鏈接
plot.setURLGenerator(new StandardPieURLGenerator(
"http://www.aygfsteel.com/supercrsky"));
JFreeChart chart = new JFreeChart("人口統計表",
JFreeChart.DEFAULT_TITLE_FONT, plot, true);
chart.setBackgroundPaint(Color.gray);
ChartUtilities.saveChartAsJPEG(new File(path), chart, 800, 600);
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
System.out.println("get begin");
// 得到當前網站在服務上的絕對路徑
String path = request.getSession().getServletContext().getRealPath("/");
// 保存到根目錄
createPieChart(path + "/chart.jpg");
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
System.out.println("post begin");
this.doGet(request, response);
}
public void destroy()
{
super.destroy();
}
}
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>ChartServlet</servlet-name>
<servlet-class>com.ChartServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ChartServlet</servlet-name>
<url-pattern>/servlet/ChartServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
index.jsp:
<%@ page language="java" pageEncoding="gbk"%>
<html>
<head>
<title>人口統計表</title>
</head>
<body>
<hr />
<img src="/jfreechart/chart.jpg" />
</body>
</html>
在瀏覽器中輸入:
http://localhost:8888/jfreechart/servlet/ChartServlet
就可以看生成的餅圖效果了.
源碼可以
點此下載