JasperReport(4)——使用一个BeanCollectionDataSource
查看JasperReport的api可以知道，JasperReport给我们提供了丰富的数据源，其中BeanCollectionDataSource是一个比较常用的数据源。正如其名，BeanCollectionDataSource是把一个装满Bean对象的Collection作为数据源，在JasperReport的模版中定义的每一个Filed就相当于Bean对象的一个Filed。
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下面是一个模版的定义，取名为report4.jrxml
<?xml version="1.0" encoding="UTF-8"?><jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="report4" language="groovy" columnCount="2" pageWidth="800" pageHeight="842" columnWidth="380" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20"><property name="ireport.zoom" value="1.0"/><property name="ireport.x" value="0"/><property name="ireport.y" value="0"/><parameter name="title" splitType="Stretch"><textField><reportElement x="62" y="19" width="630" height="29"/><textElement textAlignment="Center" verticalAlignment="Middle"><font size="16"/></textElement><textFieldExpression><![CDATA[$P{title}]]></textFieldExpression></textField></band></title><columnHeader><band height="24" splitType="Stretch"><staticText><reportElement x="226" y="2" width="100" height="20"/><textElement textAlignment="Center"><font size="12" isBold="true"/></textElement><text><![CDATA[序号]]></text></staticText><staticText><reportElement x="434" y="2" width="100" height="20"/><textElement textAlignment="Center"><font size="12" isBold="true"/></textElement><text><![CDATA[名称]]></text></staticText></band></columnHeader><detail><band height="37" splitType="Stretch"><textField><reportElement x="226" y="11" width="100" height="20"/><textElement textAlignment="Center" verticalAlignment="Middle"/><textFieldExpression><![CDATA[$F{id}]]></textFieldExpression></textField><textField><reportElement x="434" y="11" width="100" height="20"/><textElement textAlignment="Center" verticalAlignment="Middle"/><textFieldExpression><![CDATA[$F{name}]]></textFieldExpression></textField></band></detail></jasperReport>?
下面是进行测试的主程序：
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;public class Test3 {public static void main(String args[]) throws JRException {//用于传递参数的MapMap<String, Object> parameters = new HashMap<String, Object>();parameters.put("title", "JasperReport使用BeanCollectionDataSource示例");//用于建立BeanCollection数据源的CollectionList<Product> beanCollection = new ArrayList<Product>();for (int i=0; i<10; ) {Product p = new Product();p.setId(++i);p.setName("商品_" + i);beanCollection.add(p);}JRDataSource dataSource = new JRBeanCollectionDataSource(beanCollection);//编译jrxml文件JasperReport jasperReport = JasperCompileManager.compileReport("src/report4.jrxml");//填充数据JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, dataSource);//导出为html文件JasperExportManager.exportReportToHtmlFile(jasperPrint, "test3_beanCollectionDataSource.html");System.out.println(".........................");}}?
Product.class
public class Product {private int id; private String name;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}}