ireport using javabean as the datasource

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转自：http://hi.baidu.com/nieweiguo/blog/item/b92e369bf0c882b6c8eaf476.html

步骤如下：
首先在ireprot里做好所需要报表，保存 好
   

 

 

ireport里面的字段就是你要传入到jasper里的list所封装的model的字段，一一对应即可，
   在ireport里面要设置报表字段（如果要传参数到报表里，则要在ireport设置报表参数）
   ,做好报表后，就在后台ACTION（自己可以在JSP,SERVLET 封装等...）封装数据了，我做了个测试片段如下：
List list=new ArrayList();
   for(int i=0;i<50;i++)
   {
    Account accout =new Account();
    accout.setId(new Integer(i));
    accout.setEmail("邮箱youxiang"+i);
    accout.setLogin("登录名denglu"+i);
    accout.setName("姓名xingm"+i);
    accout.setPassword("密码mima"+i);
    accout.setType("类型leixing"+i);
    list.add(accout);
   }
   request.setAttribute("list",list);
   request.setAttribute("test", "anie测试test");
    return mapping.findForward("baobiao");
ACCOUNT MODEL就是你要显示在报表中的类型
   接着就转发到baobiao.jsp页面了，此页面的代码如下：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="java.util.List"%>

<%@ 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.engine.data.JRBeanCollectionDataSource" %>
<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.List"%>

<%
//获取过滤信息

String outputType = (String)request.getAttribute("outputType");
List list=(List)request.getAttribute("list");
String test = (String)request.getAttribute("test");
%>
<%
//下面两句 意思是ireport的报表XML文件在程序中动态编译成.jasper文件。注释掉就是指定了.jasper文件
//String path=application.getRealPath("/file");
//JasperCompileManager.compileReportToFile(path+"/anietest.jrxml",path+"/anietest.jasper");

File reportFile;
reportFile= new File(application.getRealPath("/file/anietest.jasper"));
JasperReport jasperReport = (JasperReport)JRLoader.loadObject(reportFile.getPath());

Map parameters = new HashMap();

parameters.put("test",test);

//为数据源设置参数

//outputType="EXCEL";

if("HTML".equals(outputType))
{
System.out.println(outputType);
   JasperPrint jasperPrint =
   JasperFillManager.fillReport(
    jasperReport,
    parameters,
    new JRBeanCollectionDataSource(list)
    );

JRHtmlExporter exporter = new JRHtmlExporter();
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);
exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN,Boolean.FALSE) ;  
exporter.setParameter(JRHtmlExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,Boolean.TRUE) ;  
exporter.exportReport();
}
else if("PDF".equals(outputType))
{
System.out.println(outputType);
   byte[] bytes =
   JasperRunManager.runReportToPdf(
    reportFile.getPath(),
    parameters,
    new JRBeanCollectionDataSource(list)
    );

      String fileName = "阿聂TEST.pdf";
    fileName=java.net.URLEncoder.encode(fileName,"utf-8");
    response.setContentType("application/download");
    response.setHeader("Content-Disposition", "attachment; filename="+fileName);
    response.setContentLength(bytes.length);
    ServletOutputStream ouputStream = response.getOutputStream();
    ouputStream.write(bytes, 0, bytes.length);
    ouputStream.flush();
    ouputStream.close();
    //PDF 跟EXCEL需要此句，要不然会报错 HTML不需要
    out.clear();
    out=pageContext.pushBody();
}
else if("EXCEL".equals(outputType)){
System.out.println(outputType);
   JasperPrint jasperPrint = JasperFillManager.fillReport(
     reportFile.getPath(),
     parameters,
     new JRBeanCollectionDataSource(list)
     );
    
     

     response.setContentType("application/vnd.ms-excel");

    
      
              JRXlsExporter exporter = new JRXlsExporter();
      byte[] bytes;
     ByteArrayOutputStream baos = new ByteArrayOutputStream();
    
              exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
              exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);
     exporter.exportReport();

     bytes = baos.toByteArray();

     if (bytes != null && bytes.length > 0) {
               response.reset();
                 String fileName = "阿聂TEST.xls";
    fileName=java.net.URLEncoder.encode(fileName,"utf-8");
    response.setContentType("application/download");
    response.setHeader("Content-Disposition", "attachment; filename="+fileName);
            
             response.setContentLength(bytes.length);
               ServletOutputStream ouputStream = response.getOutputStream();
               ouputStream.write(bytes, 0, bytes.length);
               ouputStream.flush();
               ouputStream.close();
               //PDF 跟EXCEL需要此句，要不然会报错 HTML不需要
       out.clear();
       out=pageContext.pushBody();
}

}

%>

里面有写些需要改写地方，请慢慢参考吧，很简单，其中
Map parameters = new HashMap();

parameters.put("test",test);   这句是要设置在报表里的参数，通过放入MAP中然后
传给jasper报表输出 代码如下：JasperPrint jasperPrint = JasperFillManager.fillReport(
     reportFile.getPath(),
     parameters,
     new JRBeanCollectionDataSource(list)
     );
基本主要代码就是以上了，然后说一下需要的包，基本就是只需要这几个包就行了。测试成功，饼形报表跟柱形
报表慢慢研究中