的servlet顯示雷達圖

我使用servlet代碼顯示雷達圖，但錯誤505被拋出，所以我可以爲我的鱈魚做的是的servlet顯示雷達圖

import java.io.IOException; 
import javax.servlet.ServletException; 
import javax.servlet.ServletOutputStream; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

import org.jfree.chart.ChartRenderingInfo; 
import org.jfree.chart.ChartUtilities; 
import org.jfree.chart.JFreeChart; 
import org.jfree.chart.labels.StandardCategoryToolTipGenerator; 
import org.jfree.chart.plot.SpiderWebPlot; 
import org.jfree.chart.title.TextTitle; 
import org.jfree.data.category.DefaultCategoryDataset; 

/** 
* Servlet implementation class chartexample 
*/ 
public class chartexample extends HttpServlet { 
    private static final long serialVersionUID = 1L; 

    public DefaultCategoryDataset dataset; 
    public SpiderWebPlot plot; 


    /** 
    * Default constructor. 
    */ 
    public void service(HttpServletRequest request,HttpServletResponse response){ 

     response.setContentType ("image/jpeg"); 
     ServletOutputStream sos = null; 
     try { 
      sos = response.getOutputStream(); 
     } catch (IOException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
     } 


     String series1 = "First"; 
     String series2 = "Second"; 
     String series3 = "Third"; 

     String category1 = "Task Completion"; 
     String category2 = "Accuracy"; 
     String category3 = "Sophistication"; 
     String category4 = "Listening"; 
     String category5 = "Pronunciation"; 

     DefaultCategoryDataset dataset = new DefaultCategoryDataset(); 
     dataset.addValue(5.0, series1, category1); 
     dataset.addValue(5.0, series1, category2); 
     dataset.addValue(5.0, series1, category3); 
     dataset.addValue(5.0, series1, category4); 
     dataset.addValue(5.0, series1, category5); 

     dataset.addValue(2.0, series2, category1); 
     dataset.addValue(4.0, series2, category2); 
     dataset.addValue(5.0, series2, category3); 
     dataset.addValue(3.0, series2, category4); 
     dataset.addValue(5.0, series2, category5); 


     SpiderWebPlot plot = new SpiderWebPlot(dataset); 

     plot.setStartAngle(90); 

     plot.setInteriorGap(0.30); 

     plot.setToolTipGenerator(new StandardCategoryToolTipGenerator()); 

     JFreeChart chart = new JFreeChart("", TextTitle.DEFAULT_FONT, plot, false); 

     ChartUtilities.applyCurrentTheme(chart); 

     ChartRenderingInfo render = new ChartRenderingInfo(); 

     response.setContentType ("image/jpeg"); 


     try { 
      ChartUtilities.writeChartAsJPEG(sos, chart, 800, 800); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 



    } 

}

和錯誤是

javax.servlet.ServletException: Error instantiating servlet class chartexample 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857) 
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
    java.lang.Thread.run(Unknown Source) 


root cause 

java.lang.NoClassDefFoundError: org/jfree/data/category/CategoryDataset 
    java.lang.Class.getDeclaredConstructors0(Native Method) 
    java.lang.Class.privateGetDeclaredConstructors(Unknown Source) 
    java.lang.Class.getConstructor0(Unknown Source) 
    java.lang.Class.newInstance0(Unknown Source) 
    java.lang.Class.newInstance(Unknown Source) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857) 
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
    java.lang.Thread.run(Unknown Source) 


root cause 

java.lang.ClassNotFoundException: org.jfree.data.category.CategoryDataset 
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645) 
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491) 
    java.lang.Class.getDeclaredConstructors0(Native Method) 
    java.lang.Class.privateGetDeclaredConstructors(Unknown Source) 
    java.lang.Class.getConstructor0(Unknown Source) 
    java.lang.Class.newInstance0(Unknown Source) 
    java.lang.Class.newInstance(Unknown Source) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857) 
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
    java.lang.Thread.run(Unknown Source)

來源

2011-01-21 NAYAN RAMI

java.lang.ClassNotFoundException: org.jfree.data.category.CategoryDataset

運行時類路徑中缺少JFreeChart JAR文件。將它們放在/WEB-INF/lib文件夾中。

來源

2011-01-21 12:04:12 BalusC

的servlet顯示雷達圖

回答

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