public interface CenterYearFeeService {
    /**
     * 填充报表
     * @param year 某年的报表
     */
    void fillCenterYearFeeToReport(String year);
}

import java.io.File;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRRuntimeException;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.j2ee.servlets.BaseHttpServlet;
import direction.framework.utils.WebRootPath;
import direction.shoufei.report.groupyearfee.datasource.CenterYearFeeDataSource;
import direction.shoufei.report.groupyearfee.service.CenterYearFeeService;
import direction.shoufei.report.util.DateFormatUtil;
import flex.messaging.FlexContext;

public class CenterYearFeeServiceImpl implements CenterYearFeeService{

@Override
    public void fillCenterYearFeeToReport(String year) {
        //用iReport设计好的报表编译之后的路径
        String reportFileName = new WebRootPath().getWebRootPath()
        + "/reports/shoufei/groupyearfee/GroupYearFee.jasper";
        File reportFile = new File(reportFileName);
        if (!reportFile.exists())
            throw new JRRuntimeException(
                    "File GroupYearFee.jasper not found. The report design must be compiled first.");
        //填充报表时向报表传递的参数
        Map parameters = new HashMap();
        parameters.put("QueryYear", year);
        
        String endTimeStr = year+"-12-26";
        Date endTime = DateFormatUtil.getDateByStr(endTimeStr);
        if(new Date().getTime()>endTime.getTime()){
            endTimeStr = DateFormatUtil.getStrByDate(endTime);
        }else{
            endTimeStr = DateFormatUtil.getStrByDate(new Date());
        }
        
        parameters.put("QueryEndTime", endTimeStr);
        parameters.put("PreYear", DateFormatUtil.getPreYear(year));
        
        try {
            //这里将生成的数据源和参数填充到报表里
            JasperPrint jasperPrint = JasperFillManager.fillReport(
                    reportFileName, parameters,
                    new CenterYearFeeDataSource(year));
            FlexContext.getHttpRequest().getSession().setAttribute(
                    BaseHttpServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE,
                    jasperPrint);
        } catch (JRException e) {
            e.printStackTrace();
        }
    }
}