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iReport+jasperreport创建子表的几种方式（2）

news 来源：原创 2024/5/6 3:54:40

昨天给大家讲了一种方式，今天换一种方式，就是说，将主报表的某一参数直接传递给子报表作为数据源，当然，这个参数是包含子报表的，这个主要是基于Web开发，也是从网友那边拿来的，结合自己的经验再做一遍。

首先创建我们需要的JavaBean

ProvinceBean.java

package test;

import java.util.ArrayList;

public class ProvinceBean
{
	private String provinceName;
	private ArrayList<CityBean> cities;
	public String getProvinceName()
	{
		return provinceName;
	}
	public void setProvinceName(String provinceName)
	{
		this.provinceName = provinceName;
	}
	public ArrayList<CityBean> getCities()
	{
		return cities;
	}
	public void setCities(ArrayList<CityBean> cities)
	{
		this.cities = cities;
	}
}

CityBean,java

package test;

public class CityBean
{
	private String cityName;

	public String getCityName()
	{
		return cityName;
	}

	public void setCityName(String cityName)
	{
		this.cityName = cityName;
	}
}

注意一下，这里Province是主表的元素其中他包含了cityBean，那么显然CityBean要作为子表之中的元素

下面创建Servlet类这个类我“本地化”一下，改动了一点

package test;

import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sun.net.ssl.internal.ssl.Debug;

import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.util.JRLoader;

public class ChildReportServlet extends HttpServlet
{

   private static final long serialVersionUID = -1233414483047719876L;

   @Override
   protected void doGet(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException
   {
       this.doPost(req, resp);
   }

   @Override
   protected void doPost(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException
   {
       try
       {
           String root_path = this.getServletContext().getRealPath("/");

           root_path = root_path.replace('\\', '/');
           String reportFilePath = root_path + "ireport/parent_sub.jasper";
           //Debug.println(reportFilePath, root_path);
           JRDataSource dataSource = this.createDataSource();

           Map<String, Object> parameters = new HashMap<String, Object>();
           parameters.put("SUBREPORT_DIR", root_path + "ireport/");
           JasperReport report = (JasperReport)JRLoader.loadObject(reportFilePath);
           JasperPrint jasperPrint = JasperFillManager.fillReport(report, parameters, dataSource);

            OutputStream ouputStream = resp.getOutputStream();
            resp.setContentType("application/pdf");
            resp.setCharacterEncoding("UTF-8");
            resp.setHeader("Content-Disposition", "attachment; filename=\"" +URLEncoder.encode("PDF报表", "UTF-8")+ ".pdf\"");

            // 使用JRPdfExproter导出器导出pdf
            JRPdfExporter exporter = new JRPdfExporter();
            exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, ouputStream);
            exporter.exportReport();


            ouputStream.close();

       }catch(Exception ex)
       {
           ex.printStackTrace();
       }


   }

   private JRDataSource createDataSource()
   {
       //生成测试数据
       ArrayList<ProvinceBean> provinces = new ArrayList<ProvinceBean>();

       ProvinceBean province = new ProvinceBean();
       province.setProvinceName("山东");

       ArrayList<CityBean> cities = new ArrayList<CityBean>();
       CityBean city = new CityBean();
       city.setCityName("济南");
       cities.add(city);
       city = new CityBean();
       city.setCityName("青岛");
       cities.add(city);
       city = new CityBean();
       city.setCityName("潍坊");
       cities.add(city);

       province.setCities(cities);
       provinces.add(province);

       province = new ProvinceBean();
       province.setProvinceName("江苏");

       cities = new ArrayList<CityBean>();
       city = new CityBean();
       city.setCityName("南京");
       cities.add(city);
       city = new CityBean();
       city.setCityName("无锡");
       cities.add(city);
       city = new CityBean();
       city.setCityName("苏州");
       cities.add(city);

       province.setCities(cities);
       provinces.add(province);

       return new JRBeanCollectionDataSource(provinces);
   }

}

我的文件列表

注意一下，要把jasperreport的jar文件拷贝到lib文件夹下，不然出错找度娘或者问我好了

下面用iReport制作我们需要的报表模板

这两个

打开iReport新建一个报表，数据源的话可以选择空数据源

在主表左侧属性Fields中新建字段；从上面我们创建的Bean中可以知道有两个字段需要建立一个是provinceName一个是cities

创建时候要注意cities的数据类型是list

之后创建子表，这个一路next下去就OK了，将其放到任意一个bands中，如果没有特殊的偏好设置，在主表中点击子表它的属性应该会在右边栏显示，上上次的文章我已经说过要注意Connection type属性，一个是不用，一个是和父表相同，还有一个use datasource。。。。这是这次我们要使用的，选择它然后在下面Data Source Exception 中填入

new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{cities})