asperreports + iReport初學(xué)遇到問(wèn)題,急急急!!!

Air_Fish

TestRpt Servlet 如下:
package net.ensode.jasperbook;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.HashMap;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.jasperreports.engine.JREmptyDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperRunManager;
import java.sql.*;
public class TestRpt extends HttpServlet
{
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException
  {
    ServletOutputStream servletOutputStream = response.getOutputStream();
    InputStream reportStream = getServletConfig().getServletContext()
        .getResourceAsStream("TestiReport.jasper";
    try
    {
           Connection conn = null;
         
        
            Class.forName("oracle.jdbc.driver.OracleDriver".newInstance();
   String url="jdbcracle:thin10.170.8.239:1521:poldb";
   //orcl為你的數(shù)據(jù)庫(kù)的SID
   String user="poluser";
   String password="poluser";
      conn = DriverManager.getConnection(url,user,password);
      
         JasperRunManager.runReportToPdfStream(reportStream, servletOutputStream,
          new HashMap(), conn );//new JREmptyDataSource()
         
      response.setContentType("application/pdf";
      servletOutputStream.flush();
      servletOutputStream.close();
    }
    catch (Exception e) //JR
    {
      // display stack trace in the browser
      StringWriter stringWriter = new StringWriter();
      PrintWriter printWriter = new PrintWriter(stringWriter);
      e.printStackTrace(printWriter);
      response.setContentType("text/plain";
      response.getOutputStream().print(stringWriter.toString());
    }
  }
}

加入Web.xml測(cè)試:
http://localhost:8080/rpt/testrpt

出現(xiàn)錯(cuò)誤:
500 Servlet Exceptionjava.lang.NoClassDefFoundError: Could not initialize class net.sf.jasperreports.engine.fill.JRVerticalFiller        at net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:147)        at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:57)        at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:402)        at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:363)        at net.sf.jasperreports.engine.JasperRunManager.runReportToPdfStream(JasperRunManager.java:163)        at net.ensode.jasperbook.TestRpt.doGet(TestRpt.java:43)        at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)        at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)        at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)        at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:121)        at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:17        at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:241)        at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:26        at com.caucho.server.port.TcpConnection.run(TcpConnection.java:586)        at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:690)        at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:612)        at java.lang.Thread.run(Thread.java:619)我暈,這個(gè)class文件在有呀,請(qǐng)高手指點(diǎn).

nec-tokin

環(huán)境變量CLASSPATH中的最前面有沒(méi)有加上".;".

nec-tokin

好象在
import net.sf.jasperreports.engine.JREmptyDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperRunManager;
這3個(gè)后面少加了個(gè)".fill"這個(gè)東西.

Air_Fish

import net.sf.jasperreports.engine.fill.JRVerticalFiller;
import net.sf.jasperreports.engine.fill.*;

加了這個(gè)編譯Servlet后,還是不行!
頁(yè)面運(yùn)行中出現(xiàn)加載類(lèi)失敗.