转载自：http://www.blogjava.net/bulktree/archive/2008/12/12/245963.html
继上篇bean数据源，如果我们自己定义自己的数据源该如何去写呢？
jasperReport提供了很多的便利去实现自己的DataSource，简单的有三种方式：
直接实现bean的方式 bean工厂 表格模型
还是使用前面的person.jasper文件，和Person.java VO类
直接实现bean的方式：
此种方式需要实现JRDataSource接口，定义一个二维对象数组用来存放数据，通过遍历数组的数据实现getFieldValue()和next()方法
PersonDataSource.java
package org.bulktree.ireport.customdata;
import javax.activation.DataSource;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRField;
/**
*
* @author bulktree Email: [email protected] @ Nov 7, 2008
*/
public class PersonDataSource implements JRDataSource {
public PersonDataSource() {
}
private Object[][] data = {
{ "001", "bulktree1", "Man1", "21", "001111", "IsoftStone1" },
{ "002", "bulktree2", "Man2", "22", "002222", "IsoftStone2" },
{ "003", "bulktree3", "Man3", "23", "003333", "IsoftStone3" },
{ "004", "bulktree4", "Man4", "24", "004444", "IsoftStone4" },
{ "005", "bulktree5", "Man5", "25", "005555", "IsoftStone5" },
{ "006", "bulktree6", "Man6", "26", "006666", "IsoftStone6" },
{ "007", "bulktree7", "Man7", "27", "007777", "IsoftStone7" },
{ "008", "bulktree8", "Man8", "28", "008888", "IsoftStone8" },
{ "009", "bulktree9", "Man9", "29", "009999", "IsoftStone9" },
{ "001", "oakertree1", "Man1", "21", "001111", "IsoftStone1" },
{ "002", "oakertree2", "Man2", "22", "002222", "IsoftStone2" },
{ "003", "oakertree3", "Man3", "23", "003333", "IsoftStone3" },
{ "004", "oakertree4", "Man4", "24", "004444", "IsoftStone4" },
{ "005", "oakertree5", "Man5", "25", "005555", "IsoftStone5" },
{ "006", "oakertree6", "Man6", "26", "006666", "IsoftStone6" },
{ "007", "oakertree7", "Man7", "27", "007777", "IsoftStone7" },
{ "008", "oakertree8", "Man8", "28", "008888", "IsoftStone8" },
{ "009", "oakertree9", "Man9", "29", "009999", "IsoftStone9" },
{ "001", "laoshulin1", "Man1", "21", "001111", "IsoftStone1" },
{ "002", "laoshulin2", "Man2", "22", "002222", "IsoftStone2" },
{ "003", "laoshulin3", "Man3", "23", "003333", "IsoftStone3" },
{ "004", "laoshulin4", "Man4", "24", "004444", "IsoftStone4" },
{ "005", "laoshulin5", "Man5", "25", "005555", "IsoftStone5" },
{ "006", "laoshulin6", "Man6", "26", "006666", "IsoftStone6" },
{ "007", "laoshulin7", "Man7", "27", "007777", "IsoftStone7" },
{ "008", "laoshulin8", "Man8", "28", "008888", "IsoftStone8" },
{ "009", "laoshulin9", "Man9", "29", "009999", "IsoftStone9" } };
private int index = -1;
public Object getFieldValue(JRField jrField) throws JRException {
Object value = null;
String fieldName = jrField.getName();
if ("pid".equals(fieldName)) {
value = data[index][0];
}
if ("name".equals(fieldName)) {
value = data[index][1];
}
if ("sex".equals(fieldName)) {
value = data[index][2];
}
if ("age".equals(fieldName)) {
value = data[index][3];
}
if ("password".equals(fieldName)) {
value = data[index][4];
}
if ("department".equals(fieldName)) {
value = data[index][5];
}
return value;
}
public boolean next() throws JRException {
index++;
return (index < data.length);
}
}
这个和遍历数据库Result的游标是一样的道理，刚开始的时候是指向第一条数据的前面，next一下才会指向第一条数据，相信这个不是很难懂吧！通过以下语句产生 JasperPrint对象
jasperPrint = JasperFillManager.fillReport(jasperReport,
getReportParameter(), personDataSource);
personDataSource为PersonDataSource的对象，预览效果如下：
bean工厂： 此种方式不需要实现JRDataSource接口，定义bean数组存放数据，只需要简单的提供两个方法即可：返回一个对象数组和返回一个bean集合
PersonBeanFactory.java代码如下：
package org.bulktree.ireport.customdata;
import java.util.Arrays;
import java.util.Collection;
/**
*
* @author bulktree Email: [email protected] @ Nov 7, 2008
*/
public class PersonBeanFactory {
private static Person[] data = {
new Person("001", "bulktree1", "Man1", "21", "001111", "IsoftStone1"),
new Person("002", "bulktree2", "Man2", "22", "002222", "IsoftStone2"),
new Person("003", "bulktree3", "Man3", "23", "003333", "IsoftStone3"),
new Person("004", "bulktree4", "Man4", "24", "004444", "IsoftStone4"),
new Person("005", "bulktree5", "Man5", "25", "005555", "IsoftStone5"),
new Person("006", "bulktree6", "Man6", "26", "006666", "IsoftStone6"),
new Person("007", "bulktree7", "Man7", "27", "007777", "IsoftStone7"),
new Person("008", "bulktree8", "Man8", "28", "008888", "IsoftStone8"),
new Person("009", "bulktree9", "Man9", "29", "009999", "IsoftStone9"),
new Person("001", "oakertree1", "Man1", "21", "001111", "IsoftStone1"),
new Person("002", "oakertree2",
