JfreeChart学习总结(2)

- 日理万妓 2022-04-16 03:07 171阅读 0赞

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

Java代码

1.  **public**   **class**  ChartViewer  **extends**  HttpServlet \{   
2.  **public**   **void**  init()  **throws**  ServletException \{  
3.  \}   
4.  //Process the HTTP Get request   
5.  **public**   **void**  doGet(HttpServletRequest request, HttpServletResponse response)   **throws**  ServletException, IOException \{   
6.  // get the chart from session   
7.  HttpSession session = request.getSession();   
8.  BufferedImage chartImage = (BufferedImage) session.getAttribute("chartImage" );   
9.  // set the content type so the browser can see this as a picture    
10. response.setContentType("image/png" );   
11. // send the picture    
12. PngEncoder encoder = **new**  PngEncoder(chartImage,  **false** ,  0 ,  9 );   
13. response.getOutputStream().write(encoder.pngEncode());  
14. \}   
15. //Process the HTTP Post request    
16. **public**   **void**  doPost(HttpServletRequest request, HttpServletResponse response)   **throws**  ServletException, IOException \{   
17. doGet(request, response);   
18. \}   
19. //Process the HTTP Put request    
20. **public**   **void**  doPut(HttpServletRequest request, HttpServletResponse response)  **throws**  ServletException, IOException \{   
21. \}   
22. //Clean up resources    
23. **public**   **void**  destroy() \{ \}   
24. \}

Java代码 [![复制代码][icon_copy.gif]][icon_copy.gif 1]

1.  **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() \{ \}  \}

Java代码   ![收藏代码][icon_star.png]

1.  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

Java代码

1.  <?xml version= "1.0"  encoding= "UTF-8" ?>   
2.  <web-app>   
3.   <servlet>   
4.   <servlet-name>ChartViewer</servlet-name>   
5.   <servlet-**class** >myapp.webwork.servlets.ChartViewer</servlet- **class** >   
6.  </servlet>   
7.  <servlet-mapping>   
8.  <servlet-name>ChartViewer</servlet-name>   
9.  <url-pattern>/servlet/ChartViewer</url-pattern>   
10. </servlet-mapping>   
11. </web-app>

Java代码 [![复制代码][icon_copy.gif]][icon_copy.gif 1]

1.  <?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>

Java代码   ![收藏代码][icon_star.png]

1.  <?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)

Java代码 [![复制代码][icon_copy.gif 2]][icon_copy.gif 2 1]

1.  **public**   **class**  Pie3DDemo \{   
2.  **private**  DefaultPieDataset getDataset() \{   
3.  // categories...    
4.  String\[\] section = **new**  String\[\] \{  "Jan" , "Feb" , "Mar" , "Apr" , "May" , "Jun" ,  "Jul" , "Aug" , "Sep" , "Oct" , "Nov" , "Dec"  \};   
5.  // data...    
6.  **double** \[\] data =  **new**   **double** \[section.length\];   
7.   **for**  ( **int**  i =  0 ; i < data.length; i++) \{   
8.       data\[i\] = 10  + (Math.random() \*  10 );   
9.  \}   
10. // create the dataset...    
11. DefaultPieDataset dataset = **new**  DefaultPieDataset();   
12. **for**  ( **int**  i =  0 ; i < data.length; i++) \{   
13.        dataset.setValue(section\[i\], data\[i\]);   
14. \}   
15. **return**  dataset;   
16. \}   
17. **public**  String getChartViewer(HttpServletRequest request, HttpServletResponse response) \{   
18.  DefaultPieDataset dataset = getDataset();   
19. // create the chart...    
20.  JFreeChart  chart = ChartFactory.createPie3DChart(   
21.   "Pie3D Chart Demo" ,   // chart title    
22.   dataset,             // data    
23.   **true** ,                 // include legend    
24.   **true** ,   
25.   **false**    
26.  );   
27. // set the background color for the chart...    
28. chart.setBackgroundPaint(Color.cyan);   
29. PiePlot plot = (PiePlot) chart.getPlot();   
30. plot.setNoDataMessage("No data available" );   
31. // set drilldown capability...    
32.  plot.setURLGenerator(**new**  StandardPieURLGenerator( "Bar3DDemo.jsp" , "section" ));   
33. plot.setLabelGenerator(**null** );   
34. // OPTIONAL CUSTOMISATION COMPLETED.    
35. ChartRenderingInfo info = **null** ;   
36. HttpSession session = request.getSession();   
37. **try**  \{   
38. //Create RenderingInfo object    
39.  response.setContentType("text/html" );   
40.  info = **new**  ChartRenderingInfo( **new**  StandardEntityCollection());   
41.  BufferedImage chartImage = chart.createBufferedImage(640 ,  400 , info);   
42. // putting chart as BufferedImage in session,    
43. // thus making it available for the image reading action Action.    
44. session.setAttribute("chartImage" , chartImage);   
45. PrintWriter writer = **new**  PrintWriter(response.getWriter());   
46. ChartUtilities.writeImageMap(writer, "imageMap" , info);   
47. writer.flush();   
48. \} **catch**  (Exception e) \{ \}   
49.   
50. String pathInfo = "http://" ;   
51. pathInfo += request.getServerName();   
52. **int**  port = request.getServerPort();   
53. pathInfo += ":" \+String.valueOf(port);   
54. pathInfo += request.getContextPath();   
55. String chartViewer = pathInfo + "/servlet/ChartViewer" ;   
56. **return**  chartViewer;   
57. \}

Java代码 [![复制代码][icon_copy.gif]][icon_copy.gif 1]

1.  **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;  \}

Java代码   ![收藏代码][icon_star.png]

1.  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"><span style="background-color: \#ffff00;">JFreeChart</span></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;  \}

6. 页面

Java代码

1.     
2.  <html>   
3.  <head>   
4.  <title>Pie Chart Demo</title>   
5.  </head>   
6.  <jsp:useBeanid="myChart" scope= "session" **class** = "myapp.webwork.beans.Pie3DDemo"  />   
7.  <body>   
8.  <h2>Pie Chart Demo</h2>   
9.  <%String chartViewer = myChart.getChartViewer(request, response);%>   
10. <img src="<%=chartViewer%>"  border= 0  usemap= "\#imageMap" >   
11. </body>   
12. </html>

Java代码 [![复制代码][icon_copy.gif]][icon_copy.gif 1]

1.  <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>

Java代码   ![收藏代码][icon_star.png]

1.  <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

Java代码

1.  **public**    **static**  String generatePieChart(DefaultPieDataset dataset,String title, **int**  width, **int**  height,HttpSession session, PrintWriter pw) \{   
2.    
3.  String filename = **null** ;   
4.   **try**  \{   
5.   **if**  (session !=  **null** )   
6.   \{   
7.  ChartDeleter deleter = (ChartDeleter)session.getAttribute(" JFreeChart \_Deleter" );   
8.   session.removeAttribute(" JFreeChart \_Deleter" );   
9.   session.setAttribute(" JFreeChart \_Deleter" , deleter);   
10. \}   
11. JFreeChart  chart = ChartFactory.createPieChart3D(   
12. title,  // chart title    
13. dataset, // data    
14. **true** ,   // include legend    
15. **true** ,   
16. **false**  );   
17. //  Write the chart image to the temporary directory    
18. **ChartRenderingInfo info = new  ChartRenderingInfo( new** ** StandardEntityCollection()); **   
19. //If the last parameter is null, the chart is a "one time"-chart and will be deleted after the first serving.    
20. //If the last parameter is a session object, the chart remains until session time out.    
21. **filename = ServletUtilities.saveChartAsPNG(chart, width, height, info, session); **   
22. //  Write the image map to the PrintWriter    
23.  **ChartUtilities.writeImageMap(pw, filename, info,true );   ** 
24.  **pw.flush();   **
25. \} **catch**  (Exception e) \{   
26.  System.out.println("Exception - "  + e.toString());   
27.  e.printStackTrace(System.out);   
28.  filename = "picture\_error.png" ; \}   
29. **return**  filename;   
30. \}   
31. \}

Java代码 [![复制代码][icon_copy.gif]][icon_copy.gif 1]

1.  **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;  \}  \}

Java代码   ![收藏代码][icon_star.png]

1.  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 "><span style=" background-color: \#ffff00; ">JFreeChart</span></span>\_Deleter" );   session.removeAttribute( "<span class=" hilite1 "><span style=" background-color: \#ffff00; ">JFreeChart</span></span>\_Deleter" );   session.setAttribute( "<span class=" hilite1 "><span style=" background-color: \#ffff00; ">JFreeChart</span></span>\_Deleter" , deleter);  \}  <span  class = "hilite1" ><span style= "background-color: \#ffff00;" >JFreeChart</span></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;  \}  \}

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

Java代码

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

Java代码 [![复制代码][icon_copy.gif]][icon_copy.gif 1]

1.  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;

Java代码   ![收藏代码][icon_star.png]

1.  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

Java代码

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

Java代码 [![复制代码][icon_copy.gif]][icon_copy.gif 1]

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

Java代码   ![收藏代码][icon_star.png]

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

4、在web.xml中添加

Java代码 [![复制代码][icon_copy.gif 2]][icon_copy.gif 2 1]

1.  **<servlet>  ** 
2.  **  <servlet-name>DisplayChart</servlet-name>  ** 
3.  **  <servlet-class >org.jfree.chart.servlet.DisplayChart</servlet- class >  ** 
4.  **</servlet>  ** 
5.  **<servlet-mapping>  ** 
6.  **    <servlet-name>DisplayChart</servlet-name>  ** 
7.  **    <url-pattern>/servlet/DisplayChart</url-pattern>  ** 
8.  **</servlet-mapping> **

Java代码 [![复制代码][icon_copy.gif]][icon_copy.gif 1]

1.  <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>

Java代码   ![收藏代码][icon_star.png]

1.  <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

Java代码 [![复制代码][icon_copy.gif 2]][icon_copy.gif 2 1]

1.  **public**   **class**  PieChartDemo1  **extends**  ApplicationFrame \{   
2.  **public**  PieChartDemo1(String title) \{   
3.  **super** (title);   
4.  setContentPane(createDemoPanel());   
5.  \}   
6.  **private**   **static**  JFreeChart  createChart(PieDataset dataset) \{   
7.  JFreeChart  chart = ChartFactory.createPieChart(   
8.  .......  
9.  **return**  chart;   
10. \}   
11.   
12. **public**   **static**  JPanel createDemoPanel() \{   
13. JFreeChart  chart = createChart(createDataset());   
14. **return**   **new**  ChartPanel(chart);   
15. \}   
16.   
17. **public**   **static**   **void**  main(String\[\] args) \{   
18. PieChartDemo1 demo = **new**  PieChartDemo1( "Pie Chart Demo 1" );   
19. demo.pack();   
20. RefineryUtilities.centerFrameOnScreen(demo);   
21. demo.setVisible(**true** );   
22. \}   
23. \}

Java代码 [![复制代码][icon_copy.gif]][icon_copy.gif 1]

1.  **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** );  \}  \}

Java代码   ![收藏代码][icon_star.png]

1.  public   class  PieChartDemo1  extends  ApplicationFrame \{   public  PieChartDemo1(String title) \{   super (title);  setContentPane(createDemoPanel());  \}   private   static  <span  class = "hilite1" ><span style= "background-color: \#ffff00;" >JFreeChart</span></span> createChart(PieDataset dataset) \{  <span  class = "hilite1" ><span style= "background-color: \#ffff00;" >JFreeChart</span></span> chart = ChartFactory.createPieChart(  .......  return  chart;  \}    public   static  JPanel createDemoPanel() \{  <span  class = "hilite1" ><span style= "background-color: \#ffff00;" >JFreeChart</span></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 );  \}  \}

**六. 可参考资料与网址**   
  
官方网站  
  
[http://www.jfree.org/jfreechart /index.html  ][http_www.jfree.org_jfreechart _index.html]  
  
官方论坛  
  
[http://www.jfree.org/phpBB2/index.php ][http_www.jfree.org_phpBB2_index.php]  
  
API 文档  
  
[http://www.jfree.org/jfreechart /api/gjdoc/index.html  ][http_www.jfree.org_jfreechart _api_gjdoc_index.html]  
  
中文API  
  
[http://blog.sina.com.cn/u/405da78d010000ap  ][http_blog.sina.com.cn_u_405da78d010000ap]

转自：http://wangyu.iteye.com/blog/211259

[icon_copy.gif]: http://shz2008bj.iteye.com/images/icon_copy.gif
[icon_copy.gif 1]: /images/20220416/65d05a86ea2642ffb54960d0343e58a9.png
[icon_star.png]: /images/20220416/d53b738bc13f49b2a03336080f694a0a.png
[icon_copy.gif 2]: http://ltc603.iteye.com/images/icon_copy.gif
[icon_copy.gif 2 1]: /images/20220416/cf85899707614659bef5760ac47c21db.png
[http_www.jfree.org_jfreechart _index.html]: http://www.jfree.org/jfreechart/index.html
[http_www.jfree.org_phpBB2_index.php]: http://www.jfree.org/phpBB2/index.php
[http_www.jfree.org_jfreechart _api_gjdoc_index.html]: http://www.jfree.org/jfreechart/api/gjdoc/index.html
[http_blog.sina.com.cn_u_405da78d010000ap]: http://blog.sina.com.cn/u/405da78d010000ap