我正在使用JRBeanCollectionDataSource对象来处理数据，并试图弄清楚如何安排Java对象（我猜想，JRXML中的相关设置）。
具体来说，我已经定义了一个非常独立的子报告，它使用了一个Table。为了填充表的行，我传入一个数据源，它是一个数据bean数组，作为参数传递给报告。
但是，当将该报告作为主报告中的子报告嵌入时，我不清楚我应该如何传递相应的数据对象。但我似乎无法找到任何这方面的例子。如果您知道任何示例，那就太棒了！
否则，到目前为止我所得到的：
每个子报告都有一些参数和3个表格。
数据Bean（每个基本上都是表的一行）：
public class DataBean {
public String c1_name;
public String c2_name;
public String c1_value;
public String c2_value;
public String getC1_name() {
return c1_name;
}
public void setC1_name(String s) {
this.c1_name = s;
}
public String getC2_name() {
return c2_name;
}
public void setC2_name(String s) {
this.c2_name = s;
}
public String getC1_value() {
return c1_value;
}
public void setC1_value(String s) {
this.c1_value = s;
}
public String getC2_value() {
return c2_value;
}
public void setC2_value(String s) {
this.c2_value = s;
}
}
Master Bean（包含所有3个表的数据集和每个子报告所需的3个参数）：
import java.util.ArrayList;
public class MasterBean {
private ArrayList<DataBean> t1; // Table 1
private ArrayList<DataBean> t2a; // Table 2, column 1
private ArrayList<DataBean> t2b; // Table 2, column 2
private String disclaimer;
private String event_detail;
private String event_type;
public ArrayList<DataBean> getT1() {
return t1;
}
public void setT1(ArrayList<DataBean> beanlist) {
this.t1 = beanlist;
}
public ArrayList<DataBean> getT2a() {
return t2a;
}
public void setT2a(ArrayList<DataBean> beanlist) {
this.t2a = beanlist;
}
public ArrayList<DataBean> getT2b() {
return t2b;
}
public void setT2b(ArrayList<DataBean> beanlist) {
this.t2b = beanlist;
}
public String getDisclaimer() {
return disclaimer;
}
public void setDisclaimer(String s) {
this.disclaimer = s;
}
public String getEvent_detail() {
return event_detail;
}
public void setEvent_detail(String s) {
this.event_detail = s;
}
public String getEvent_type() {
return event_type;
}
public void setEvent_type(String s) {
this.event_type = s;
}
}
为了填写报告（有趣的部分），我有点想要它，因为我没有找到任何文档：
... (snip) ...
DataBeanList DataBeanList = new DataBeanList();
ArrayList<DataBean> t1_1 = DataBeanList.getDataBeanList(0);
ArrayList<DataBean> t2a_1 = DataBeanList.getDataBeanList(1);
ArrayList<DataBean> t2b_1 = DataBeanList.getDataBeanList(2);
MasterBean sub1 = new MasterBean();
sub1.setT1(t1_1);
sub1.setT2a(t2a_1);
sub1.setT2b(t2b_1);
sub1.setDisclaimer("Disclaimer 1 goes here");
sub1.setEvent_detail("Event Detail 1 goes here");
sub1.setEvent_type("Event Type 1 goes here");
ArrayList<DataBean> t1_2 = DataBeanList.getDataBeanList(0);
ArrayList<DataBean> t2a_2 = DataBeanList.getDataBeanList(1);
ArrayList<DataBean> t2b_2 = DataBeanList.getDataBeanList(2);
MasterBean sub2 = new MasterBean();
sub2.setT1(t1_2);
sub2.setT2a(t2a_2);
sub2.setT2b(t2b_2);
sub2.setDisclaimer("Disclaimer 2 goes here");
sub2.setEvent_detail("Event Detail 2 goes here");
sub2.setEvent_type("Event Type 2 goes here");
ArrayList<DataBean> t1_3 = DataBeanList.getDataBeanList(0);
ArrayList<DataBean> t2a_3 = DataBeanList.getDataBeanList(1);
ArrayList<DataBean> t2b_3 = DataBeanList.getDataBeanList(2);
MasterBean sub3 = new MasterBean();
sub3.setT1(t1_3);
sub3.setT2a(t2a_3);
sub3.setT2b(t2b_3);
sub3.setDisclaimer("Disclaimer 3 goes here");
sub3.setEvent_detail("Event Detail 3 goes here");
sub3.setEvent_type("Event Type 3 goes here");
ArrayList<MasterBean> masterList = new ArrayList<MasterBean>();
masterList.add(sub1);
masterList.add(sub2);
masterList.add(sub3);
JRBeanCollectionDataSource datasource = new JRBeanCollectionDataSource(masterList);
Map params = new HashMap();
params.put("report_type","Master Report Type");
try {
/deaton/jasper/jasperreports-5.5.1/demo/samples/testme/reports/CASummary.jrxml“）; JasperReport jasperSub = JasperCompileManager.compileReport（“/ home / deaton / jasper / jasperreports-5.5.1 / demo / samples / testme / reports / CAEventDetails.jrxml”）; params.put（ “subreportParameter”，jasperSub）; params，tdatasource）; params，new JREmptyDataSource（2））; JasperFillManager.fillReportToFile（“build / reports / CASummary.jasper”，params，datasource）; ......（剪辑）...
对于子报告，这里是JRXML中的一些有趣的部分：
... (snip) ...
<subDataset name="instrument_details" uuid="6d672249-f7b2-44ca-9f8a-6cb4995fdfab">
<field name="c1_name" class="java.lang.String"/>
<field name="c1_value" class="java.lang.String"/>
<field name="c2_name" class="java.lang.String"/>
<field name="c2_value" class="java.lang.String"/>
</subDataset>
<subDataset name="event_information" uuid="f2f954af-98c1-4f2b-9c57-e666d309fdce">
<field name="c1_name" class="java.lang.String"/>
<field name="c1_value" class="java.lang.String"/>
<field name="c2_name" class="java.lang.String"/>
<field name="c2_value" class="java.lang.String"/>
</subDataset>
<parameter name="disclaimer" class="java.lang.String"/>
<parameter name="event_detail" class="java.lang.String"/>
<parameter name="event_type" class="java.lang.String"/>
<parameter name="DS1" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<parameter name="DS2" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<parameter name="DS3" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<field name="event_comments" class="java.lang.String"/>
<field name="event_description" class="java.lang.String"/>
... (skip down) ...
<componentElement>
<reportElement key="table" style="table" x="0" y="20" width="572" height="20" uuid="a3e03a5d-48cd-4bf4-82f4-df7de7958a75"/>
<jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
<datasetRun subDataset="instrument_details" uuid="1e25358d-f600-4ea3-80b3-f15d4438992c">
<datasetParameter name="REPORT_DATA_SOURCE">
<datasetParameterExpression><![CDATA[$P{DS1}]]></datasetParameterExpression>
</datasetParameter>
</datasetRun>
<jr:column width="100" uuid="f4c26fd2-95ae-49a4-8b6f-8fbe6f47f810">
<jr:detailCell style="table_TD" height="20" rowSpan="1">
<textField>
<reportElement x="0" y="0" width="100" height="20" uuid="578b42c1-3065-419a-8758-4e1b4946ca04"/>
<textFieldExpression><![CDATA[$F{c1_name}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="186" uuid="ceb83fa5-ed21-4cca-b374-aae224688297">
<jr:detailCell style="table_TD" height="20" rowSpan="1">
<textField>
<reportElement x="0" y="0" width="186" height="20" uuid="d5cdb3c8-af89-4af7-bd94-ee6fda45f327"/>
<textFieldExpression><![CDATA[$F{c1_value}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="100" uuid="ca9810a7-6684-49e2-b673-ed84278a5d20">
<jr:detailCell style="table_TD" height="20" rowSpan="1">
<textField>
<reportElement x="0" y="0" width="100" height="20" uuid="e6765684-2042-47e7-858d-b2b0d9ae8eaf"/>
<textFieldExpression><![CDATA[$F{c2_name}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="186" uuid="c99af79c-5373-41c4-a05a-4538da4504df">
<jr:detailCell style="table_TD" height="20" rowSpan="1">
<textField>
<reportElement x="0" y="0" width="186" height="20" uuid="e4079374-640c-4a79-b315-a1f33079bfd3"/>
<textFieldExpression><![CDATA[$F{c2_value}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
</jr:table>
</componentElement>
... (above repeated for other tables) ...
最后，我怀疑我已经离开的部分，主报告，我无能为力：
... (snip) ...
<parameter name="SUBREPORT_DIR" class="java.lang.String" isForPrompting="false">
<defaultValueExpression><![CDATA["/home/deaton/jasper/jasperreports-5.5.1/demo/samples/testme/build/reports/"]]></defaultValueExpression>
</parameter>
<parameter name="report_type" class="java.lang.String"/>
<parameter name="master_source" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<parameter name="subreportParameter" class="net.sf.jasperreports.engine.JasperReport"/>
<field name="disclaimer" class="java.lang.String"/>
<field name="event_detail" class="java.lang.String"/>
<field name="event_type" class="java.lang.String"/>
<field name="t1" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<field name="t2a" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<field name="t2b" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
... (skip a bit) ...
<detail>
<band height="125" splitType="Stretch">
<subreport>
<reportElement x="0" y="0" width="572" height="125" uuid="aba34d2d-04ee-4ff7-803b-14424c825b3f"/>
<subreportParameter name="disclaimer">
<subreportParameterExpression>
<![CDATA[$F{disclaimer}]]>
</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="event_detail">
<subreportParameterExpression>
<![CDATA[$F{event_detail}]]>
</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="event_type">
<subreportParameterExpression>
<![CDATA[$F{event_type}]]>
</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="DS1">
<subreportParameterExpression>
<![CDATA[$F{t1}]]>
</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="DS2">
<subreportParameterExpression>
<![CDATA[$F{t2a}]]>
</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="DS3">
<subreportParameterExpression>
<![CDATA[$F{t2b}]]>
</subreportParameterExpression>
</subreportParameter>
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
<subreportExpression><![CDATA[$P{SUBREPORT_DIR} + "CAEventDetails.jasper"]]></subreportExpression>
</subreport>
</band>
</detail>
... (snip) ...
当我运行它时，它编译，填写报告，但然后......没有。没有数据进入我的报告。我甚至无法在主报表中看到我的子报表中的任何静态元素（尝试使用带有倍数的空数据集，但仍然是zilch）。
所以...我怀疑我做了一些根本错误的事情，但我似乎无法弄清楚如何根据主数据源将参数适当地传递给子报告，或者作为a的子记录参数。我尝试了很多组合，但是一切似乎都无法编译，或者没有给我任何数据。