iReport工具的使用（三）

Java后台代码的实现

申明：直接拷贝代码会有错误，这里只是为了说明流程。

前面一节中已经创建了DataBean，这一节主要来完成报表的填充。

1、 需要把所有报表中展现的数据封装成一个DataBean对象的List

package direction.shoufei.report.groupyearfee.model;

import java.util.List;
import direction.shoufei.report.groupyearfee.data.CenterYearFee;

public class CenterYearFeeModel {
    public List<CenterYearFee> getCenterYearFeeList(String year) {
        //这里通过连接数据库或者其它方式将报表中展现的数据封装为一个List
        return List对象;
    }
}

 

2、    生成数据源，必须实现JRDataSource接口

package direction.shoufei.report.groupyearfee.datasource;

import java.util.ArrayList;
import java.util.List;

import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRField;
import direction.shoufei.report.groupyearfee.data.CenterYearFee;
import direction.shoufei.report.groupyearfee.model.CenterYearFeeModel;

public class CenterYearFeeDataSource implements JRDataSource {

    private List<CenterYearFee> data = new ArrayList<CenterYearFee>();

    public CenterYearFeeDataSource(String year) {
        data = new CenterYearFeeModel().getCenterYearFeeList(year);
    }

    private int index = -1;

    @Override
    public Object getFieldValue(JRField field) throws JRException {
        Object value = null;

        String fieldName = field.getName();

        if ("centerId".equals(fieldName)) {
            value = data.get(index).getCenterId();
        } else if ("centerName".equals(fieldName)) {
            value = data.get(index).getCenterName();
        } else if ("summary".equals(fieldName)) {
            value = data.get(index).getSummary();
        } else if ("preYearRate".equals(fieldName)) {
            value = data.get(index).getPreYearRate();
        } else if ("month1Fee".equals(fieldName)) {
            value = data.get(index).getMonth1Fee();
        } else if ("month2Fee".equals(fieldName)) {
            value = data.get(index).getMonth2Fee();
        } else if ("month3Fee".equals(fieldName)) {
            value = data.get(index).getMonth3Fee();
        }
        ...
        return value;
    }

    @Override
    public boolean next() throws JRException {
        index++;
        return (index < data.size());
    }
}

 

3、 填充报表

a-接口

package direction.shoufei.report.groupyearfee.service;

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

b-填充报表的实现

package direction.shoufei.report.groupyearfee.service.support;

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();
        }
    }
}

 

这样就完成了报表的填充，报表的展现将在下一节说明。