Using JFreeChart with JSP/Servlet

Code:

/**

 * Created on Feb 3, 2011

 */

package org.jfree.chart.servlet;



import java.awt.image.BufferedImage;

import java.io.IOException;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;



import com.keypoint.PngEncoder;



/**

 * Title: ChartViewer.java</p>

 * Description: Controller class to display chart
image</p>

 * Author: [email protected]

 */

public class ChartViewer extends HttpServlet {



  private static final long serialVersionUID = 1L;

 

  //Process the HTTP Get request

  public void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{

 

    String imageName =
request.getParameter("ImageName");

    // get the chart from session

    HttpSession session = request.getSession();

    BufferedImage chartImage = (BufferedImage)
session.getAttribute(imageName);

   

    // set the content type so the browser can see this
as a picture

    response.setContentType("image/png");

   

    // send the picture

    PngEncoder encoder = new PngEncoder(chartImage,
false, 0, 9);

   
response.getOutputStream().write(encoder.pngEncode());

 

  }

 

  //Process the HTTP Post request

  public void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{

    doGet(request, response);

  }

}

Code:

/**

 * Created on Feb 3, 2011

 */

package org.jfree.chart.util;



import java.awt.image.BufferedImage;

import java.io.PrintWriter;



import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;



import org.jfree.chart.ChartRenderingInfo;

import org.jfree.chart.ChartUtilities;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.entity.StandardEntityCollection;



/**

 * Title: ChartProducer.java

 * Description: Model class to produce chart and image map

 * Author: [email protected]

 * Version 1.0.0 New release

 * Version 1.1.0 Update 21-Feb-11, Get a new chart when user
call getChartViewer()

 */

public abstract class ChartProducer {



  /** Variables declaration */

  public JFreeChart chart;

  private String imageName;

  private String imageMap;

  public abstract JFreeChart getChart();

  public abstract JFreeChart getChart(String title);

 

  /**

  * Get the chart viewer information

  * @param request

  * @param response

  */

  public String getChartViewer(HttpServletRequest request,
HttpServletResponse response) {

    // Create the chart...

    chart = getChart();

    return getChartViewer(chart, request, response);

  }

 

  /**

  * Get the chart viewer information

  * @param request

  * @param response

  */

  public String getChartViewer(String title,
HttpServletRequest request, HttpServletResponse response) {

    // Create the chart...

    chart = getChart(title);

    return getChartViewer(chart, request, response);

  }

 

  /**

  * Get the chart viewer information

  * @param chart

  * @param request

  * @param response

  */

  private String getChartViewer(JFreeChart chart,
HttpServletRequest request, HttpServletResponse response) {

 

    ChartRenderingInfo info = null;

    HttpSession session = request.getSession();

    try {

   

      // Create the RenderingInfo object

      response.setContentType("text/html");

      info = new ChartRenderingInfo(new
StandardEntityCollection());

      BufferedImage chartImage =
chart.createBufferedImage(640, 400, info);

     

      // Putting chart as BufferedImage in the
session, 

      // thus making it available for the image
reading action.

      session.setAttribute(imageName,
chartImage);

     

      // Create the image map support tool tip and
drill down capability

      PrintWriter writer = new
PrintWriter(response.getWriter());

      ChartUtilities.writeImageMap(writer, imageMap,
info, true);

     

      writer.flush();

   

    }

    catch (Exception e) {

      System.out.println(e);

    }

   

    // Refer to chart viewer servlet declared in web.xml
deployment descriptor

    String url = request.getRequestURL().toString();

    String urlInfo = url.substring(0,
url.lastIndexOf(':'));

    int port = request.getServerPort();

    urlInfo += ":"+String.valueOf(port);

    urlInfo += request.getContextPath();

    String chartViewer = urlInfo +
"/chartViewer?ImageName="+imageName;

    return chartViewer;

  }

 

  /**

  * Constructor

  * @param vImageName

  * @param vImageMap

  */

  public ChartProducer(String vImageName, String vImageMap)
{

    imageName = vImageName;

    imageMap = vImageMap;

  }

 

  /**

  * Constructor

  */

  public ChartProducer() {

  }

 

}

Code:

/*

 * Created on Feb 3, 2011

 */

package org.jfree.chart.demo;



import java.awt.Color;

import java.awt.GridLayout;

import java.awt.image.BufferedImage;

import java.text.NumberFormat;



import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JScrollPane;



import org.jfree.chart.ChartFactory;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.labels.StandardPieSectionLabelGenerator;

import org.jfree.chart.plot.PiePlot;

import org.jfree.chart.urls.StandardPieURLGenerator;

import org.jfree.chart.util.ChartProducer;

import org.jfree.data.general.DefaultPieDataset;



/**

 * Title: Pie3DChart.java</p>

 * Description: Model class to create chart</p>

 * Author: [email protected]

 * Engine: JFreeChart 1.0.13

 * Caller: Pie3DDemo.jsp

 * Version 1.0.0 New release

 * Version 1.1.0 Update 21-Feb-11, Remove getChart() from
constructor, but get it when user call getChartViever()

 */

public class Pie3DChart extends ChartProducer {



  private static final String IMAGE_NAME = "pieImage";

  private static final String IMAGE_MAP = "pieImageMap";

 

  // constructor

  public Pie3DChart() {

    super(IMAGE_NAME, IMAGE_MAP);

  }

 

  /**

  * Produce pie chart 3D.

  * @return chart.

  */

  public JFreeChart getChart() {

    // create the dataset...

    DefaultPieDataset dataset = getDataset();

    // create the chart...

    JFreeChart chart = ChartFactory.createPieChart3D(

          "Pie3DChart",   
    // chart title

          dataset,   
        // data

          true,     
          // include legend

          true,    
  // tool tips

          false    
  // url

    );

    return getChart(chart);

  }

 

  /**

  * Produce pie chart 3D.

  * @param title

  * @return chart.

  */

  public JFreeChart getChart(String title) {

    // create the dataset...

    DefaultPieDataset dataset = getDataset();

    // create the chart...

    JFreeChart chart = ChartFactory.createPieChart3D(

          title,     
        // chart title

          dataset,   
      // data

          true,     
        // include legend

          true,    
      // tool tips

          false    
      // url

    );

    return getChart(chart);

  }

 

  /**

  * Produce pie chart 3D.

  * @param chart

  * @return chart.

  */

  private JFreeChart getChart(JFreeChart chart) {

    // set the background color for the chart...

    chart.setBackgroundPaint(new Color(222, 222,
255));

   

    PiePlot plot = (PiePlot) chart.getPlot();

    plot.setBackgroundPaint(Color.white);

    plot.setLabelGenerator(

    new StandardPieSectionLabelGenerator(

      "{0} = {2}", NumberFormat.getNumberInstance(),
NumberFormat.getPercentInstance()

    ));

    plot.setNoDataMessage("No data available");

   

    // set color transparency...

    plot.setForegroundAlpha(0.6f);

   

    // set drilldown capability...

    plot.setURLGenerator(new
StandardPieURLGenerator("Bar3DDemo.jsp","section"));

   

    // OPTIONAL CUSTOMISATION COMPLETED.

    return chart;

  }

 

  /**

  * Create a pie dataset.

  * @return dataset.

  */

  private static DefaultPieDataset getDataset() {

    // period keys...

    String[] section = new String[] {

    "Jan","Feb","Mar","Apr","May","Jun",

    "Jul","Aug","Sep","Oct","Nov","Dec"

    };

   

    // data...

    double[] data = new double[section.length];

    for (int i = 0; i < data.length; i++) {

      data[i] = 10 + (Math.random() * 10);

    }

   

    // create the dataset...

    DefaultPieDataset dataset = new
DefaultPieDataset();

    for (int i = 0; i < data.length; i++) {

      dataset.setValue(section[i], data[i]);

    }

    return dataset;

  }

 

  /**

  * For testing only, display chart for Java application

  * @param args

  * @throws Exception

  */

  public static void main(String[] args) throws Exception
{

    JPanel p = new JPanel(new GridLayout(1,1,1,1));

    BufferedImage bimg =
Pie3DChart.getChart().createBufferedImage(480, 300);

    ImageIcon icon = new ImageIcon(bimg);

    p.add(new JLabel(icon));

    JFrame f = new JFrame("Pie3DChart");

    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    f.getContentPane().add(new JScrollPane(p));

    f.pack();

    f.setLocationRelativeTo(null);

    f.setVisible(true);

  }

 

}

Code:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app

    PUBLIC "-//Sun Microsystems, Inc.//DTD Web
Application 2.2//EN"

   
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">



<web-app>

  <servlet>

   
<servlet-name>ChartViewer</servlet-name>

   
<servlet-class>org.jfree.chart.servlet.ChartViewer</servlet-class>

  </servlet>

 

  <servlet-mapping>

   
<servlet-name>ChartViewer</servlet-name>

   
<url-pattern>/chartViewer</url-pattern>

  </servlet-mapping>



</web-app>

Code:

<html>

<head>

<script type="text/javascript"
src="./scripts/overlib_mini.js"></script>

<div id="overDiv" style="position:absolute; visibility:hidden;
z-index:1000"></div>

<title>Pie3DChart Demo</title>

</head>



<jsp:useBean id="myChart"
class="org.jfree.chart.demo.Pie3DChart"/>

<%

  String productName =
request.getParameter("ProductName");

  String chartImage = null;

  if (productName != null) {

    chartImage = myChart.getChartViewer(productName,
request, response);

  }

%>



<body>

<table border=0>

<tr>

  <td width=170 valign="top">

  <form id="form1" name="form1"
action="Pie3DDemo.jsp">

  <table border=0>

  <tr>

    <td>

      Fruit:<br>

      <select name="ProductName">

        <option
value="APPLE">APPLE</option>

        <option
value="BANANA">BANANA</option>

        <option
value="ORANGE">ORANGE</option>

      </select>

    </td>

  </tr>

  <tr>

    <td>

      <input type="submit" name="Submit"
value="Submit">

    </td>

  </tr>

  </table>

  </form>

  </td>

  <td>

  <h2>Pie3DChart Demo</h2>

 

  <%if (chartImage != null) {%>

    <img src="<%=chartImage%>" border=0
usemap="#pieImageMap">

  <%}%>

 

  <p>

  The chart shown above has tooltips and drilldown
enabled.<br>

  Chart image save to output stream instead of
filesystem.<br>

  <a href="MultiChartDemo.jsp">Multi Chart
Demo</a>

  </p>

 

  </td>

</tr>

</table>



</body>

</html>

Code:

/*

 * Created on Feb 3, 2011

 */

package org.jfree.chart.demo;



import java.awt.Color;

import java.awt.GridLayout;

import java.awt.image.BufferedImage;



import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JScrollPane;



import org.jfree.chart.ChartFactory;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.axis.ValueAxis;

import
org.jfree.chart.labels.StandardCategoryItemLabelGenerator;

import org.jfree.chart.labels.StandardCategoryToolTipGenerator;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.plot.PlotOrientation;

import org.jfree.chart.renderer.category.BarRenderer3D;

import org.jfree.chart.renderer.category.CategoryItemRenderer;

import org.jfree.chart.urls.StandardCategoryURLGenerator;

import org.jfree.chart.util.ChartProducer;

import org.jfree.data.category.DefaultCategoryDataset;



/**

 * Title: Bar3DChart.java</p>

 * Description: Model class to create a bar
chart</p>

 * Author: [email protected]

 * Engine: JFreeChart 1.0.13

 * Caller: Bar3DDemo.jsp

 */

public class Bar3DChart extends ChartProducer {

   

  private static final String IMAGE_NAME = "barImage";

  private static final String IMAGE_MAP = "barImageMap";

 

  /**

  * Constructor.

  */

  public Bar3DChart() {

    super(IMAGE_NAME, IMAGE_MAP);

  }

 

  /**

  * Produce single bar chart 3D.

  * @return chart.

  */

  public JFreeChart getChart() {

    // create the dataset...

    DefaultCategoryDataset dataset = getDataset();

   

    // create the chart...

    chart = ChartFactory.createBarChart3D(

      "Bar3DChart", // chart title

      "Category",  // domain axis label

      "Value",      // range axis
label

      dataset,      // data

      PlotOrientation.VERTICAL,

      false,        // include
legend

      false,        //
tooltips

      false        // urls

    );

    return getChart(chart);

  }

 

  /**

  * Produce single bar chart 3D.

  * @param title

  * @return chart.

  */

  public JFreeChart getChart(String title) {

    // create the dataset...

    DefaultCategoryDataset dataset = getDataset();

   

    // create the chart...

    chart = ChartFactory.createBarChart3D(

      title,        // chart
title

      "Category",  // domain axis label

      "Value",      // range axis
label

      dataset,      // data

      PlotOrientation.VERTICAL,

      false,        // include
legend

      false,        //
tooltips

      false        // urls

    );

    return getChart(chart);

  }

 

  /**

  * Produce single bar chart 3D.

  * @param chart

  * @return chart.

  */

  private JFreeChart getChart(JFreeChart chart) {

    // DO SOME OPTIONAL CUSTOMIZATION OF THE CHART...

   

    // set the background color for the chart...

    chart.setBackgroundPaint(new Color(222, 222,
255));

   

    // get a reference to the plot for further
customization...

    CategoryPlot plot = chart.getCategoryPlot();

    plot.setNoDataMessage("NO DATA!");

   

    // display a chart label

    final CategoryItemRenderer renderer = new
BarRenderer3D();

    renderer.setBaseItemLabelGenerator(new
StandardCategoryItemLabelGenerator());

    renderer.setBaseItemLabelsVisible(true);

   

    // set URL link for drilldrown capability...

    renderer.setBaseItemURLGenerator(new
StandardCategoryURLGenerator("Pie3DDemo.jsp","series","categories"));

    renderer.setBaseToolTipGenerator(new
StandardCategoryToolTipGenerator());

    renderer.setBaseItemLabelsVisible(true);

    plot.setRenderer(renderer);

   

    // change the margin at the top of the range
axis...

    ValueAxis rangeAxis = plot.getRangeAxis();

   
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

    rangeAxis.setLowerMargin(0.15);

    rangeAxis.setUpperMargin(0.15);

   

    // OPTIONAL CUSTOMISATION COMPLETED.

    return chart;

  }

 

  /**

  * Create a single bar dataset.

  * @return dataset.

  */

  private DefaultCategoryDataset getDataset() {

    // create group...

    String[] series = new String[] {"Series1"};

   

    // create peroid...

    String[] categories = new String[] {

      "Jan","Feb","Mar","Apr","May","Jun",

      "Jul","Aug","Sep","Oct","Nov","Dec"

    };

   

    // create data...

    double mod = 0;

    double[][] data = new
double[series.length][categories.length];

    for (int i = 0; i < data.length; i++) {

    for (int j = 0; j < data[0].length; j++) {

      mod = (Math.random() * 10) - 2;

      mod /= Math.abs(mod);

      data[i][j] = mod * (Math.random() * 10);

    }

    }

   

    // create the dataset...

    DefaultCategoryDataset dataset = new
DefaultCategoryDataset();

    for (int i = 0; i < series.length; i++)

    for (int j = 0; j < categories.length; j++)

    dataset.addValue(data[i][j], series[i],
categories[j]);

   

    return dataset;

  }

 

  /**

  * For testing only, display chart for Java application

  * @param args

  * @throws Exception

  */

  public static void main(String[] args) throws Exception
{

    Bar3DChart barChart = new Bar3DChart();

    JPanel p = new JPanel(new GridLayout(1,1,1,1));

    BufferedImage bimg =
barChart.getChart().createBufferedImage(640, 400);

    ImageIcon icon = new ImageIcon(bimg);

    p.add(new JLabel(icon));

    JFrame f = new JFrame("Bar3DChart");

    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    f.getContentPane().add(new JScrollPane(p));

    f.pack();

    f.setLocationRelativeTo(null);

    f.setVisible(true);

  }

 

}

Code:

<html>

<head>

<script type="text/javascript"
src="./scripts/overlib_mini.js"></script>

<div id="overDiv" style="position:absolute; visibility:hidden;
z-index:1000"></div>

<title>Multi Chart Demo</title>

</head>



<%

  String productName =
request.getParameter("ProductName");

  String chart1 = null;

  String chart2 = null;

%>

<jsp:useBean id="myChart1"
class="org.jfree.chart.demo.Pie3DChart"/>

<%

  if (productName != null) {

    chart1 = myChart1.getChartViewer(productName,
request, response);

  }

%>

<jsp:useBean id="myChart2"
class="org.jfree.chart.demo.Bar3DChart"/>

<%

  if (productName != null) {

    chart2 = myChart2.getChartViewer(productName,
request, response);

  }

%>



<body>

<table border=0>

<tr>

  <td width=170 valign="top">

  <form id="form1" name="form1"
action="MultiChartDemo.jsp">

  <table border=0>

  <tr>

    <td>

      Fruit:<br>

      <select name="ProductName">

        <option
value="APPLE">APPLE</option>

        <option
value="BANANA">BANANA</option>

        <option
value="ORANGE">ORANGE</option>

      </select>

    </td>

  </tr>

  <tr>

    <td>

      <input type="submit" name="Submit"
value="Submit">

    </td>

  </tr>

  </table>

  </form>

  </td>

  <td>

  <h2>Multi Chart Demo</h2>

 

  <%if (chart2 != null) {%>

    <img src="<%=chart2%>" border=0
usemap="#barImageMap">

  <%}%>

  <%if (chart1 != null) {%>

    <img src="<%=chart1%>" border=0
usemap="#pieImageMap">

  <%}%>

 

  <p>

  The chart shown above has tooltips and drilldown
enabled.<br>

  Chart image save to output stream instead of
filesystem.<br>

  </p>

 

  </td>

</tr>

</table>



</body>

</html>

มือใหม่ป้ายแดง

Using JFreeChart with JSP/Servlet

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