JasperFillManager.fillReport()這個(gè)方法在使用JDBC數(shù)據(jù)源時(shí)采用一個(gè)打開的數(shù)據(jù)庫連接(getConn),除此之外jasperReport給我們提供了一個(gè)JRDataSource接口，用以實(shí)現(xiàn)我們自己的數(shù)據(jù)源
JRDataSource接口只有兩個(gè)方法
public interface JRDataSource
{
/**
* 針對(duì)當(dāng)前的數(shù)據(jù)源返回游標(biāo)指向的下一個(gè)元素的值，
*
*/
public boolean next() throws JRException;
/**
* 返回游標(biāo)指向的當(dāng)前值
*
*/
public Object getFieldValue(JRField jrField) throws JRException;
}
JRBeanCollectionDataSource
此種方式是最簡單的一種，查看API我們就可以發(fā)現(xiàn)，JRBeanCollectionDataSource繼承JRAbstractBeanDataSource類，而JRAbstractBeanDataSource是一個(gè)抽象類它間接的實(shí)現(xiàn)了JRDataSource這個(gè)接口，所以我們就可以不用自己去實(shí)現(xiàn)next()/getFieldValue()這兩個(gè)方法了。
看到JRBeanCollectionDataSource這個(gè)類名大概就知道怎么用了吧！
我們的模板文件還是上篇的
JDBC數(shù)據(jù)源的模板，只是沒有了查詢語句，手工建立所需的幾個(gè)字段(域)
新建一vo對(duì)象Person.java，最基本的getter、setter方法
package org.bulktree.ireport.customdata;
/** *//**
* custom data
*
* @author bulktree Email: laoshulin@gmail.com @ Nov 7, 2008
*/
public class Person 
{
private String pid;
private String name;
private String sex;
private String age;
private String password;
private String department;
public Person(String pid, String name, String sex, String age, String password,
String department) {
this.pid = pid;
this.name = name;
this.sex = sex;
this.age = age;
this.password = password;
this.department = department;
}
public Person() {
}
}
下來準(zhǔn)備數(shù)據(jù)
Person p1 = new Person();
p1.setAge("23");
p1.setDepartment("ISoftStone");
p1.setName("LAOSHULIN");
p1.setPassword("123456789");
p1.setPid("2008040516058772hj");
p1.setSex("man");
既然它是一個(gè)BeanCollection我們 就來一個(gè)從conllection吧！
List<Person> list = new ArrayList<Person>();
list.add(p1);
查看API，JRBeanCollectionDataSource的構(gòu)造函數(shù)
public JRBeanCollectionDataSource(Collection beanCollection)
{
this(beanCollection, true);
}
/** *//**
*
*/
public JRBeanCollectionDataSource(Collection beanCollection, boolean isUseFieldDescription)
{
super(isUseFieldDescription);
this.data = beanCollection;
if (this.data != null)
{
this.iterator = this.data.iterator();
}
}
看看描述我們使用第一個(gè)
JRDataSource datesource = new JRBeanCollectionDataSource(list);
這個(gè)數(shù)據(jù)源就構(gòu)造完畢了，很簡單吧！這樣報(bào)表就可以預(yù)覽了，完整的代碼如下：
package org.bulktree.ireport.customdata;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperExportManager;
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.util.JRLoader;
import net.sf.jasperreports.view.JRViewer;
import net.sf.jasperreports.view.JasperViewer;
public class JasperReportDemo {
public static void main(String[] args) throws Exception {
JasperReportDemo jrd = new JasperReportDemo();
jrd.reportMethod(jrd.getMap());
}
public void reportMethod(Map map) throws Exception {
JasperReport jasperReport = null;
JasperPrint jasperPrint = null;
try {
/**//*
* File file = new File("Person.jrxml"); InputStream in = new
* FileInputStream(file); // 編譯報(bào)表 jasperReport =
* JasperCompileManager.compileReport(in);
*/
// 實(shí)際中編譯報(bào)表很耗時(shí),采用Ireport編譯好的報(bào)表
jasperReport = (JasperReport) JRLoader
.loadObject("D:\\workspace\\Person.jasper");
// 填充報(bào)表
jasperPrint = JasperFillManager
.fillReport(jasperReport, map, getDataSource());
// JasperExportManager.exportReportToHtmlFile(jasperPrint,
// "test.html");
JasperViewer jasperViewer = new JasperViewer(jasperPrint);
jasperViewer.setVisible(true);
} catch (JRException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
public Map getMap() {
Map map = new HashMap();
map.put("reportTitle", "laoshulin");
return map;
}
public JRDataSource getDataSource() throws Exception {
// 自定義數(shù)據(jù)源
Person p1 = new Person();
p1.setAge("23");
p1.setDepartment("ISoftStone");
p1.setName("LAOSHULIN");
p1.setPassword("123456789");
p1.setPid("2008040516058772hj");
p1.setSex("man");
List<Person> list = new ArrayList<Person>();
list.add(p1);
JRDataSource datesource = new JRBeanCollectionDataSource(list);
return datesource;
}
}
看看效果吧！
簡簡單單的幾行代碼就可以完成一個(gè)簡單的報(bào)表，我們看到的這些工具欄圖表還有窗口的一些標(biāo)題啊等等都可以自己的定制哦，下來慢慢介紹！