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HomeDatabaseMysql TutorialiReport+jasperreport创建子表的几种方式(2)

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

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 parameters = new HashMap();
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 provinces = new ArrayList();

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

ArrayList cities = new ArrayList();
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();
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})

\

如下图:$F{cities}就是我们要传递给字表的数据,只注重技术,不考虑美观,做的就随意了些

\

下面切换到子表的设计界面,把那些没有用到的bands删掉或者高度设为0

不知道你还记不记得上面我们创建的CityBean,它包含一个属性参数,而我们传给子表的是一个City列表,那么在子表中我们要把它提取出来

所以,在子表的fields中新建字段cityName这个字段属性要和CityBean里面的完全一样,不然就会出错的。

之后点击preview,当然是在主表中点击,会跳出些让输入什么的,不用管它,我们只要是想让iReport编译我们的文件形成后缀名为.jasper,也借此检查一下是否有错。

编译之后把主表和子表拷贝到之前说的那位置,运行服务器

\

打开:

\

需要源码请留邮箱,欢迎来探讨

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