java web中做自定义报表怎么做?

Question

我在网上搜了下，大概有ireport&jasperreport和jfreereport两种,但是介绍怎么用的资料很少,谁做过这方面的东东烦劳您帮我一下,谢谢!
分不够再加

Answer 1

用ireport制作要打印的文件，编译生成*.jasper(例如：classic.jasper)文件，把该文件放在jasperreport中report文件夹中，然后套在下面的程序：<%@ page contentType="text/html; charset=gb2312"%>
<%@ page import="javax.naming.Context"%>
<%@ page import="javax.sql.DataSource"%>
<%@ page import="javax.naming.InitialContext"%>
<%@ page import="java.sql.*"%>
<%@ page import="javax.sql.*"%><%@ page errorPage="error.jsp" %>
<%@ page import="net.sf.jasperreports.engine.*" %>
<%@ page import="net.sf.jasperreports.engine.util.*" %>
<%@ page import="net.sf.jasperreports.engine.export.*" %>
<%@ page import="net.sf.jasperreports.j2ee.servlets.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%
   Connection conn;
   try{
       Context initCtx = new InitialContext();
       Context envCtx=(Context) initCtx.lookup("java:comp/env");
       //从Context中lookup数据源
       ds=(DataSource)envCtx.lookup("DbConn");
       conn=ds.getConnection();
            }catch(Exception ne){
               out.println(ne);
           }
File reportFile = new File(application.getRealPath("/reports/classic.jasper"));
    if (!reportFile.exists())
throw new JRRuntimeException("File Test.jasper not found. The report design must be compiled first.");JasperReport jasperReport = (JasperReport)JRLoader.loadObject(reportFile.getPath());Map parameters = new HashMap();
parameters.put("ReportTitle", "Address Report");
parameters.put("BaseDir", reportFile.getParentFile());JasperPrint jasperPrint =
JasperFillManager.fillReport(
jasperReport,
parameters,
conn
);JRHtmlExporter exporter = new JRHtmlExporter();StringBuffer sbuffer = new StringBuffer();session.setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, jasperPrint);exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "../servlets/image?image=");exporter.exportReport();       conn.close();%>注意：
"DbConn"是数据源的名字，
"/reports/classic.jasper"这个路径一定要正确

Answer 2

能否提供完整例子学习吗？谢谢jr_zhang。　我的QQ：５０８８７３５５

Answer 3

现在我选用了ireport&jasperreport。但是我在试验饼状图的时候出现了下面的错误：
Error&nbsp;filling&nbsp;print...&nbsp;Null&nbsp;'key'&nbsp;argument. 
java.lang.IllegalArgumentException:&nbsp;Null&nbsp;'key'&nbsp;argument.&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;org.jfree.data.DefaultKeyedValues.setValue(DefaultKeyedValues.java:225)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;org.jfree.data.general.DefaultPieDataset.setValue(DefaultPieDataset.java:187)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.charts.fill.JRFillPieDataset.customIncrement(JRFillPieDataset.java:158)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.fill.JRFillElementDataset.increment(JRFillElementDataset.java:169)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.fill.JRCalculator.calculateVariables(JRCalculator.java:152)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:604)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:209)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:109)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:751)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:660)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:63)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:402)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:234)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;it.businesslogic.ireport.IReportCompiler.run(IReportCompiler.java:815)&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;at&nbsp;java.lang.Thread.run(Thread.java:595)&nbsp; 
Print was not filled. Try using an EmptyDataSource...
谁能帮我解决这个问题？非常感谢
解决后马上给分