[color=red][size=xx-large]1.空数据（Empty Datasources）[/size][/color]
就是说JRXML文件里面的内容都是静态的,直接使用
JREmptyDataSource就行了
JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, new HashMap(), new JREmptyDataSource());
[color=red][size=xx-large]2.Map数组（Map Datasources）[/size][/color]
有的时候数据不一定要从数据库里面来，还有可能从Map数组里面来
成生Map[]的方法
private Map[] initializeMapArray(){//你可以把数组里面的每个map看成一个对象，就相于数据库里面的每个字段HashMap[] reportRows = new HashMap[4];HashMap row1Map = new HashMap();HashMap row2Map = new HashMap();HashMap row3Map = new HashMap();HashMap row4Map = new HashMap();row1Map.put("tail_num", "N263Y");row1Map.put("aircraft_serial", "T-11");row1Map.put("aircraft_model", "39 ROSCOE TRNR RACER");row1Map.put("engine_model", "R1830 SERIES");row2Map.put("tail_num", "N4087X");row2Map.put("aircraft_serial", "BA100-163");row2Map.put("aircraft_model", "BRADLEY AEROBAT");row2Map.put("engine_model", "R2800 SERIES");row3Map.put("tail_num", "N43JE");row3Map.put("aircraft_serial", "HAYABUSA 1");row3Map.put("aircraft_model", "NAKAJIMA KI-43 IIIA");row3Map.put("engine_model", "R1830 SERIES");row4Map.put("tail_num", "N912S");row4Map.put("aircraft_serial", "9973CC");row4Map.put("aircraft_model", "PA18-150");row4Map.put("engine_model", "R-1820 SER");reportRows[0] = row1Map;reportRows[1] = row2Map;reportRows[2] = row3Map;reportRows[3] = row4Map;return reportRows;}
生成JRMapArrayDataSource对象
private JRDataSource createReportDataSource(){JRMapArrayDataSource dataSource;Map[] reportRows = initializeMapArray();dataSource = new JRMapArrayDataSource(reportRows);return dataSource;}
Servlet里面
JRDataSource dataSource = createReportDataSource();JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, new HashMap(), dataSource);
[color=red][size=xx-large]3.Map集合[/size][/color]
private JRDataSource createReportDataSource(){JRMapCollectionDataSource dataSource;Collection reportRows = initializeMapCollection();dataSource = new JRMapCollectionDataSource(reportRows);return dataSource;}private Collection initializeMapCollection(){ArrayList reportRows = new ArrayList();HashMap row1Map = new HashMap();HashMap row2Map = new HashMap();HashMap row3Map = new HashMap();HashMap row4Map = new HashMap();row1Map.put("tail_num", "N263Y");row1Map.put("aircraft_serial", "T-11");row1Map.put("aircraft_model", "39 ROSCOE TRNR RACER");row1Map.put("engine_model", "R1830 SERIES");row2Map.put("tail_num", "N4087X");row2Map.put("aircraft_serial", "BA100-163");row2Map.put("aircraft_model", "BRADLEY AEROBAT");row2Map.put("engine_model", "R2800 SERIES");row3Map.put("tail_num", "N43JE");row3Map.put("aircraft_serial", "HAYABUSA 1");row3Map.put("aircraft_model", "NAKAJIMA KI-43 IIIA");row3Map.put("engine_model", "R1830 SERIES");row4Map.put("tail_num", "N912S");row4Map.put("aircraft_serial", "9973CC");row4Map.put("aircraft_model", "PA18-150");row4Map.put("engine_model", "R-1820 SER");reportRows.add(row1Map);reportRows.add(row2Map);reportRows.add(row3Map);reportRows.add(row4Map);return reportRows;}
使用
JRDataSource dataSource = createReportDataSource();JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, new HashMap(), dataSource);
[size=xx-large][color=red]4.对象数组（Java Objects as Datasources）[/color][/size]对象JAVABEAN
public class AircraftData{public AircraftData(String tail, String serial, String model,String engine){setTailNum(tail);setAircraftSerial(serial);setAircraftModel(model);setEngineModel(engine);}public AircraftData(){}private String tailNum;private String aircraftSerial;private String aircraftModel;private String engineModel;//set get method.....}
JRXML文件
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE jasperReport PUBLIC "//JasperReports//DTD Report Design//EN""http://jasperreports.sourceforge.net/dtds/jasperreport.dtd"><jasperReport name="AircraftReport"><field name="tailNum" class="java.lang.String"/><field name="aircraftSerial" class="java.lang.String"/><field name="aircraftModel" class="java.lang.String"/><field name="engineModel" class="java.lang.String"/><pageHeader><band height="30"><staticText><reportElement x="0" y="0" width="69" height="24"/><textElement verticalAlignment="Bottom"/><text><![CDATA[Tail Number: ]]></text></staticText><staticText><reportElement x="140" y="0" width="69" height="24"/><text><![CDATA[Serial Number: ]]></text></staticText><staticText><reportElement x="280" y="0" width="69" height="24"/><text><![CDATA[Model: ]]></text></staticText><staticText><reportElement x="420" y="0" width="69" height="24"/><text><![CDATA[Engine: ]]></text></staticText></band></pageHeader><detail><band height="30"><textField><reportElement x="0" y="0" width="69" height="24"/><textFieldExpression class="java.lang.String"><![CDATA[$F{tailNum}]]></textFieldExpression></textField><textField><reportElement x="140" y="0" width="69" height="24"/><textFieldExpression class="java.lang.String"><![CDATA[$F{aircraftSerial}]]></textFieldExpression></textField><textField><reportElement x="280" y="0" width="69" height="24"/><textFieldExpression class="java.lang.String"><![CDATA[$F{aircraftModel}]]></textFieldExpression></textField><textField><reportElement x="420" y="0" width="69" height="24"/><textFieldExpression class="java.lang.String"><![CDATA[$F{engineModel}]]></textFieldExpression></textField></band></detail></jasperReport>
调用
private JRDataSource createReportDataSource(){JRBeanArrayDataSource dataSource;AircraftData[] reportRows = initializeBeanArray();dataSource = new JRBeanArrayDataSource(reportRows);return dataSource;}private AircraftData[] initializeBeanArray(){AircraftData[] reportRows = new AircraftData[4];reportRows[0] = new AircraftData("N263Y", "T-11", "39 ROSCOE TRNRRACER", "R1830 SERIES");reportRows[1] = new AircraftData("N4087X", "BA100-163", "BRADLEYAEROBAT", "R2800 SERIES");reportRows[2] = new AircraftData("N43JE", "HAYABUSA 1", "NAKAJIMAKI-43 IIIA", "R1830 SERIES");reportRows[3] = new AircraftData("N912S", "9973CC", "PA18-150","R-1820 SER");return reportRows;}//最后servlet里面调用JRDataSource dataSource = createReportDataSource();JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, new HashMap(), dataSource);
[size=xx-large][color=red]5.对象集合[/color][/size]
和对象数组基本上一样,就是最后生成的是JRBeanCollectionDataSource
private JRDataSource createReportDataSource(){JRBeanCollectionDataSource dataSource;Collection reportRows = initializeBeanCollection();dataSource = new JRBeanCollectionDataSource(reportRows);return dataSource;}JRDataSource dataSource = createReportDataSource();JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, new HashMap(), dataSource);
[size=xx-large][color=red]6.XML数据成生报表（XML as Datasource）[/color][/size]
<?xml version="1.0" encoding="UTF-8"?><AircraftData><aircraft><tail_num>N263Y</tail_num><aircraft_serial>T-11</aircraft_serial><aircraft_model>39 ROSCOE TRNR RACER</aircraft_model><engine_model>R1830 SERIES</engine_model></aircraft><aircraft><tail_num>N4087X</tail_num><aircraft_serial>BA100-163</aircraft_serial><aircraft_model>BRADLEY AEROBAT</aircraft_model><engine_model>R2800 SERIES</engine_model></aircraft><aircraft><tail_num>N43JE</tail_num><aircraft_serial>HAYABUSA 1</aircraft_serial><aircraft_model>NAKAJIMA KI-43 IIIA</aircraft_model><engine_model>R1830 SERIES</engine_model></aircraft><aircraft><tail_num>N912S</tail_num><aircraft_serial>9973CC</aircraft_serial><aircraft_model>PA18-150</aircraft_model><engine_model>R-1820 SER</engine_model></aircraft></AircraftData>
这样获得
JRXmlDataSource xmlDataSource = new JRXmlDataSource(new BufferedInputStream(getServletConfig().getServletContext().getResourceAsStream("/reports/AircraftData.xml")),"/AircraftData/aircraft");
JREmptyDataSource,JRMapArrayDataSource,JRMapCollectionDataSource,JRBeanArrayDataSource,JRBeanCollectionDataSource,JRXmlDataSource
他们都implements JRDataSource
主要目地就是不从数据库里面取数据，这个方面和Hibernate结合
相关资源：JasperReport与Java程序，导出不同格式的报表，包括pdf,excel,html,报表打印等功能
