JfreeChart学习总结(2)

3）jsp＋servlet＋javabean方式
1. Create ChartViewer servlet

public class ChartViewer extends HttpServlet {
public void init() throws ServletException {
}
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {
// get the chart from session
HttpSession session = request.getSession();
BufferedImage chartImage = (BufferedImage) session.getAttribute("chartImage");
// 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);
}
//Process the HTTP Put request
public void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
//Clean up resources
public void destroy() { }
}

public class ChartViewer extends HttpServlet {  public void init() throws ServletException { }  //Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {  // get the chart from session HttpSession session = request.getSession();  BufferedImage chartImage = (BufferedImage) session.getAttribute("chartImage");  // 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);  }  //Process the HTTP Put request  public void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  }  //Clean up resources  public void destroy() { }  }

public class ChartViewer extends HttpServlet {  public void init() throws ServletException { }  //Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {  // get the chart from session HttpSession session = request.getSession();  BufferedImage chartImage = (BufferedImage) session.getAttribute("chartImage");  // 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);  }  //Process the HTTP Put request  public void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  }  //Clean up resources  public void destroy() { }  } 

2. Create a servlet map in web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
 <servlet>
 <servlet-name>ChartViewer</servlet-name>
 <servlet-class>myapp.webwork.servlets.ChartViewer</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ChartViewer</servlet-name>
<url-pattern>/servlet/ChartViewer</url-pattern>
</servlet-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>  <web-app>   <servlet>   <servlet-name>ChartViewer</servlet-name>   <servlet-class>myapp.webwork.servlets.ChartViewer</servlet-class>  </servlet>  <servlet-mapping>  <servlet-name>ChartViewer</servlet-name>  <url-pattern>/servlet/ChartViewer</url-pattern>  </servlet-mapping>  </web-app>

<?xml version="1.0" encoding="UTF-8"?>  <web-app>   <servlet>   <servlet-name>ChartViewer</servlet-name>   <servlet-class>myapp.webwork.servlets.ChartViewer</servlet-class>  </servlet>  <servlet-mapping>  <servlet-name>ChartViewer</servlet-name>  <url-pattern>/servlet/ChartViewer</url-pattern>  </servlet-mapping>  </web-app> 

3. Create a chart in a java bean (Pie3DDemo.java)

public class Pie3DDemo {
private DefaultPieDataset getDataset() {
// categories...
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;
}
public String getChartViewer(HttpServletRequest request, HttpServletResponse response) {
 DefaultPieDataset dataset = getDataset();
// create the chart...
 JFreeChart chart = ChartFactory.createPie3DChart(
  "Pie3D Chart Demo",  // chart title
  dataset,             // data
  true,                // include legend
  true,
  false
 );
// set the background color for the chart...
chart.setBackgroundPaint(Color.cyan);
PiePlot plot = (PiePlot) chart.getPlot();
plot.setNoDataMessage("No data available");
// set drilldown capability...
 plot.setURLGenerator(new StandardPieURLGenerator("Bar3DDemo.jsp","section"));
plot.setLabelGenerator(null);
// OPTIONAL CUSTOMISATION COMPLETED.
ChartRenderingInfo info = null;
HttpSession session = request.getSession();
try {
//Create RenderingInfo object
 response.setContentType("text/html");
 info = new ChartRenderingInfo(new StandardEntityCollection());
 BufferedImage chartImage = chart.createBufferedImage(640, 400, info);
// putting chart as BufferedImage in session,
// thus making it available for the image reading action Action.
session.setAttribute("chartImage", chartImage);
PrintWriter writer = new PrintWriter(response.getWriter());
ChartUtilities.writeImageMap(writer, "imageMap", info);
writer.flush();
} catch (Exception e) { }

String pathInfo = "http://";
pathInfo += request.getServerName();
int port = request.getServerPort();
pathInfo += ":"+String.valueOf(port);
pathInfo += request.getContextPath();
String chartViewer = pathInfo + "/servlet/ChartViewer";
return chartViewer;
}

public class Pie3DDemo {  private DefaultPieDataset getDataset() {  // categories...  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;  }  public String getChartViewer(HttpServletRequest request, HttpServletResponse response) {   DefaultPieDataset dataset = getDataset();  // create the chart...   <SPAN class=hilite1>JFreeChart</SPAN> chart = ChartFactory.createPie3DChart(    "Pie3D Chart Demo",  // chart title    dataset,             // data    true,                // include legend    true,    false   );  // set the background color for the chart...  chart.setBackgroundPaint(Color.cyan);  PiePlot plot = (PiePlot) chart.getPlot();  plot.setNoDataMessage("No data available");  // set drilldown capability...   plot.setURLGenerator(new StandardPieURLGenerator("Bar3DDemo.jsp","section"));  plot.setLabelGenerator(null);  // OPTIONAL CUSTOMISATION COMPLETED.  ChartRenderingInfo info = null;  HttpSession session = request.getSession();  try {  //Create RenderingInfo object   response.setContentType("text/html");   info = new ChartRenderingInfo(new StandardEntityCollection());   BufferedImage chartImage = chart.createBufferedImage(640, 400, info);  // putting chart as BufferedImage in session,  // thus making it available for the image reading action Action.  session.setAttribute("chartImage", chartImage);  PrintWriter writer = new PrintWriter(response.getWriter());  ChartUtilities.writeImageMap(writer, "imageMap", info);  writer.flush();  } catch (Exception e) { }   String pathInfo = "http://";  pathInfo += request.getServerName();  int port = request.getServerPort();  pathInfo += ":"+String.valueOf(port);  pathInfo += request.getContextPath();  String chartViewer = pathInfo + "/servlet/ChartViewer";  return chartViewer;  }

public class Pie3DDemo {  private DefaultPieDataset getDataset() {  // categories...  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;  }  public String getChartViewer(HttpServletRequest request, HttpServletResponse response) {   DefaultPieDataset dataset = getDataset();  // create the chart...   JFreeChart chart = ChartFactory.createPie3DChart(    "Pie3D Chart Demo",  // chart title    dataset,             // data    true,                // include legend    true,    false   );  // set the background color for the chart...  chart.setBackgroundPaint(Color.cyan);  PiePlot plot = (PiePlot) chart.getPlot();  plot.setNoDataMessage("No data available");  // set drilldown capability...   plot.setURLGenerator(new StandardPieURLGenerator("Bar3DDemo.jsp","section"));  plot.setLabelGenerator(null);  // OPTIONAL CUSTOMISATION COMPLETED.  ChartRenderingInfo info = null;  HttpSession session = request.getSession();  try {  //Create RenderingInfo object   response.setContentType("text/html");   info = new ChartRenderingInfo(new StandardEntityCollection());   BufferedImage chartImage = chart.createBufferedImage(640, 400, info);  // putting chart as BufferedImage in session,  // thus making it available for the image reading action Action.  session.setAttribute("chartImage", chartImage);  PrintWriter writer = new PrintWriter(response.getWriter());  ChartUtilities.writeImageMap(writer, "imageMap", info);  writer.flush();  } catch (Exception e) { }   String pathInfo = "http://";  pathInfo += request.getServerName();  int port = request.getServerPort();  pathInfo += ":"+String.valueOf(port);  pathInfo += request.getContextPath();  String chartViewer = pathInfo + "/servlet/ChartViewer";  return chartViewer;  } 

6. 页面

<html>
<head>
<title>Pie Chart Demo</title>
</head>
<jsp:useBeanid="myChart"scope="session"class="myapp.webwork.beans.Pie3DDemo" />
<body>
<h2>Pie Chart Demo</h2>
<%String chartViewer = myChart.getChartViewer(request, response);%>
<img src="<%=chartViewer%>" border=0 usemap="#imageMap">
</body>
</html>

<html>  <head>  <title>Pie Chart Demo</title>  </head>  <jsp:useBeanid="myChart"scope="session"class="myapp.webwork.beans.Pie3DDemo" />  <body>  <h2>Pie Chart Demo</h2>  <%String chartViewer = myChart.getChartViewer(request, response);%>  <img src="<%=chartViewer%>" border=0 usemap="#imageMap">  </body>  </html>

  <html>  <head>  <title>Pie Chart Demo</title>  </head>  <jsp:useBeanid="myChart"scope="session"class="myapp.webwork.beans.Pie3DDemo" />  <body>  <h2>Pie Chart Demo</h2>  <%String chartViewer = myChart.getChartViewer(request, response);%>  <img src="<%=chartViewer%>" border=0 usemap="#imageMap">  </body>  </html> 

4）采用工具类ChartUtil和DisplayChart（jfreechart的servlet）输出
我用了上面的几个方法输出图片，发现页面里只能输出一个图片，
不过下面的方法可以输出多个图片,而且是几种方式中最简单的一个，推荐使用。

这种方式和上面的三种比较类似，是将javabean里的生成图片的方法写的一个工具类ChartUtil里面。

1 ．添加工具类ChartUtil
public class ChartUtil {
// 产生时间序列图，返回图片名称

public  static String generatePieChart(DefaultPieDataset dataset,String title,int width,int height,HttpSession session, PrintWriter pw) {

String filename = null;
 try {
 if (session != null)
 {
ChartDeleter deleter = (ChartDeleter)session.getAttribute("JFreeChart_Deleter");
 session.removeAttribute("JFreeChart_Deleter");
 session.setAttribute("JFreeChart_Deleter", deleter);
}
JFreeChart chart = ChartFactory.createPieChart3D(
title,  // chart title
dataset, // data
true,  // include legend
true,
false );
//  Write the chart image to the temporary directory
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
//If the last parameter is null, the chart is a "one time"-chart and will be deleted after the first serving.
//If the last parameter is a session object, the chart remains until session time out.
filename = ServletUtilities.saveChartAsPNG(chart, width, height, info, session);
//  Write the image map to the PrintWriter
 ChartUtilities.writeImageMap(pw, filename, info,true);
 pw.flush();
} catch (Exception e) {
 System.out.println("Exception - " + e.toString());
 e.printStackTrace(System.out);
 filename = "picture_error.png"; }
return filename;
}
}

public  static String generatePieChart(DefaultPieDataset dataset,String title,int width,int height,HttpSession session, PrintWriter pw) {   String filename = null;   try {   if (session != null)   {  ChartDeleter deleter = (ChartDeleter)session.getAttribute("<SPAN class=hilite1>JFreeChart</SPAN>_Deleter");   session.removeAttribute("<SPAN class=hilite1>JFreeChart</SPAN>_Deleter");   session.setAttribute("<SPAN class=hilite1>JFreeChart</SPAN>_Deleter", deleter);  }  <SPAN class=hilite1>JFreeChart</SPAN> chart = ChartFactory.createPieChart3D(  title,  // chart title  dataset, // data  true,  // include legend  true,  false );  //  Write the chart image to the temporary directory  ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());  //If the last parameter is null, the chart is a "one time"-chart and will be deleted after the first serving.  //If the last parameter is a session object, the chart remains until session time out.  filename = ServletUtilities.saveChartAsPNG(chart, width, height, info, session);  //  Write the image map to the PrintWriter   ChartUtilities.writeImageMap(pw, filename, info,true);   pw.flush();  } catch (Exception e) {   System.out.println("Exception - " + e.toString());   e.printStackTrace(System.out);   filename = "picture_error.png"; }  return filename;  }  }

public  static String generatePieChart(DefaultPieDataset dataset,String title,int width,int height,HttpSession session, PrintWriter pw) {   String filename = null;   try {   if (session != null)   {  ChartDeleter deleter = (ChartDeleter)session.getAttribute("JFreeChart_Deleter");   session.removeAttribute("JFreeChart_Deleter");   session.setAttribute("JFreeChart_Deleter", deleter);  }  JFreeChart chart = ChartFactory.createPieChart3D(  title,  // chart title  dataset, // data  true,  // include legend  true,  false );  //  Write the chart image to the temporary directory  ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());  //If the last parameter is null, the chart is a "one time"-chart and will be deleted after the first serving.  //If the last parameter is a session object, the chart remains until session time out.  filename = ServletUtilities.saveChartAsPNG(chart, width, height, info, session);  //  Write the image map to the PrintWriter   ChartUtilities.writeImageMap(pw, filename, info,true);   pw.flush();  } catch (Exception e) {   System.out.println("Exception - " + e.toString());   e.printStackTrace(System.out);   filename = "picture_error.png"; }  return filename;  }  } 

2、在action里统计数据，设置好数据集dataset。传到页面

3、 在页面里取出
DefaultPieDataset piedataset=(DefaultPieDataset)request.getAttribute("piedataset");
// 用ChartUtil工具类产生图片

String p = ChartUtil.generatePieChart(piedataset," 项目收支线图",500,300,null, new PrintWriter(out));
String p1 = request.getContextPath() + "/servlet/DisplayChart?filename=" + p;

String p = ChartUtil.generatePieChart(piedataset," 项目收支线图",500,300,null, new PrintWriter(out));  String p1 = request.getContextPath() + "/servlet/DisplayChart?filename=" + p;

String p = ChartUtil.generatePieChart(piedataset," 项目收支线图",500,300,null, new PrintWriter(out));  String p1 = request.getContextPath() + "/servlet/DisplayChart?filename=" + p; 

通过以下方式输出

<td><img src="<%= p1 %>" width=500 height=300 border=0 usemap="#<%= p %>"></td>

<td><img src="<%= p1 %>" width=500 height=300 border=0 usemap="#<%= p %>"></td>

<td><img src="<%= p1 %>" width=500 height=300 border=0 usemap="#<%= p %>"></td>

4、在web.xml中添加

<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>

<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>

<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） ApplicationFrame 方式

public class PieChartDemo1 extends ApplicationFrame {
public PieChartDemo1(String title) {
super(title);
setContentPane(createDemoPanel());
}
private static JFreeChart createChart(PieDataset dataset) {
JFreeChart chart = ChartFactory.createPieChart(
.......
return chart;
}

public static JPanel createDemoPanel() {
JFreeChart chart = createChart(createDataset());
return new ChartPanel(chart);
}

public static void main(String[] args) {
PieChartDemo1 demo = new PieChartDemo1("Pie Chart Demo 1");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
}

public class PieChartDemo1 extends ApplicationFrame {  public PieChartDemo1(String title) {  super(title);  setContentPane(createDemoPanel());  }  private static <SPAN class=hilite1>JFreeChart</SPAN> createChart(PieDataset dataset) {  <SPAN class=hilite1>JFreeChart</SPAN> chart = ChartFactory.createPieChart(  ....... return chart;  }   public static JPanel createDemoPanel() {  <SPAN class=hilite1>JFreeChart</SPAN> chart = createChart(createDataset());  return new ChartPanel(chart);  }   public static void main(String[] args) {  PieChartDemo1 demo = new PieChartDemo1("Pie Chart Demo 1");  demo.pack();  RefineryUtilities.centerFrameOnScreen(demo);  demo.setVisible(true);  }  }

public class PieChartDemo1 extends ApplicationFrame {  public PieChartDemo1(String title) {  super(title);  setContentPane(createDemoPanel());  }  private static JFreeChart createChart(PieDataset dataset) {  JFreeChart chart = ChartFactory.createPieChart(  ....... return chart;  }   public static JPanel createDemoPanel() {  JFreeChart chart = createChart(createDataset());  return new ChartPanel(chart);  }   public static void main(String[] args) {  PieChartDemo1 demo = new PieChartDemo1("Pie Chart Demo 1");  demo.pack();  RefineryUtilities.centerFrameOnScreen(demo);  demo.setVisible(true);  }  } 

六. 可参考资料与网址

官方网站

http://www.jfree.org/jfreechart/index.html

官方论坛

http://www.jfree.org/phpBB2/index.php

API 文档

http://www.jfree.org/jfreechart/api/gjdoc/index.html

中文API

http://blog.sina.com.cn/u/405da78d010000ap