Ireport 子報表創建及細節問題

Ireport子報表基礎

第一步：先在MyEclipse裏創建項目和該有的JAVA文件，目 錄如下：

 ProvinceBean.java內容如下：

CityBean.java內容如下：

 ChildServlet.java內容如下：


第二步：通過IReport來畫模板，文件如下：

 其中cities屬性的類型是ArrayList，但是在選擇類型的時候沒有這個類型，所以要自己手動改：



第三步，建立子報表：




會彈出一個子報表的窗體，在這個窗體裏就寫入對應有子實體的字段即可（CityBean.java）：

返回到主表裏，對子報表的屬性進行設置：

\

表達式全部內容：new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{cities})

第四步：編譯文件
先編譯子報表的文件，再編譯主報表：
會在IReport的根目錄下生成：main.jasper、main_sub.jasper 兩個文件；
把這兩個文件複製到Tomcat對應這個項目下的指定目 錄下，即可：
(D:\WorkSoft\Tomcat-5.5\webapps\ireportdemo\WEB-INF\classes\zlq\test\ireport\child)

========================說明結束=========================

下面我把代碼補齊，直接複製就可以用：


ProvinceBean.java

import java.util.ArrayList;

public class ProvinceBean {
private String provinceName; // 省份

private ArrayList<CityBean> cities; // 城市集合

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;
}

public int getCityCount() {
if (this.cities != null)
return this.cities.size();
else
return 0;
}
}

CityBean.java

public class CityBean {
private String cityName;    //城市名

public String getCityName() {
return cityName;
}

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

ChildServlet.java

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 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;

/**
* 子報表測試
*/
public class ChildServlet extends HttpServlet {

public ChildServlet() {
super();
}

public void destroy() {
super.destroy();
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}

/**
* 把JavaBean裏的數據轉化成JRDataSource
*/
private JRDataSource createDataSource() {
ArrayList<ProvinceBean> provinces = new ArrayList<ProvinceBean>();

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

ArrayList<CityBean> cities = new ArrayList<CityBean>();

CityBean city = new CityBean();
city.setCityName("濟南");
cities.add(city);
city = new CityBean();
city.setCityName("青島");
cities.add(city);
city = new CityBean();
city.setCityName("濰坊");
cities.add(city);

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

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

cities = new ArrayList<CityBean>();
city = new CityBean();
city.setCityName("南京");
cities.add(city);
city = new CityBean();
city.setCityName("無錫");
cities.add(city);
city = new CityBean();
city.setCityName("蘇州");
cities.add(city);
city = new CityBean();
city.setCityName("揚州");
cities.add(city);

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

return new JRBeanCollectionDataSource(provinces);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
String root_path = this.getServletContext().getRealPath("/");
root_path = root_path.replace('\\', '/');
String reportFilePath = root_path+ "WEB-INF/classes/zlq/test/ireport/child/main.jasper";
JRDataSource dataSource = this.createDataSource();

Map<String, String> parameters = new HashMap<String, String>();
parameters.put("SUBREPORT_DIR", root_path+ "WEB-INF/classes/zlq/test/ireport/child/");
JasperReport report=(JasperReport)JRLoader.loadObject(reportFilePath);
JasperPrint jasperPrint = JasperFillManager.fillReport(report, parameters, dataSource);
OutputStream ouputStream = response.getOutputStream();  
response.setContentType("application/pdf");
response.setCharacterEncoding("UTF-8");  
response.setHeader("Content-Disposition", "attachment; filename=\""  
+ URLEncoder.encode("PDF報表", "UTF-8") + ".pdf\"");  
// 使用JRPdfExproter導出器導出pdf
JRPdfExporter exporter = new JRPdfExporter();  
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, ouputStream);  
exporter.exportReport();
ouputStream.close(); 
} catch (Exception e) {
e.printStackTrace();
}
}