我希望有人能告诉我为什么下面的代码每次都会创建一个空的pdf文件？
我正在尝试编译，填充并运行JasperReports 4.0.2附带的xmldatasource示例项目。虽然我正在尝试以编程方式进行，因为我想在我自己的软件中使用类似的（非基于蚂蚁的）编译方法。 Jasper附带的同一个项目使用ant脚本来创建报告，它可以工作。所以我知道JRXML文件没有问题。但是，我似乎无法正确填写数据报告。
当我调试Jasper引擎源以查看我的XML源文档是否正确加载时，我发现PARAMETER_XML_DOCUMENT具有值
[＃document：null]
您是否认为这意味着无法正确读取XML源文件？
代码编译并运行时没有错误，并且生成了所有相关文件（.jasper，.jrprint和.pdf），但由于某种原因，渲染的PDF文档每次只显示一个空白页。
非常感谢任何帮助...
public static void main(String[] args) {
Map map = new RenderReportBean().execute("northwind", "OrdersReport");
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public Map execute(String sourceFileId, String templateId, Integer[] formats) {
Map params = new HashMap();
Document document;
Map<Integer, Boolean> renderedSuccessList = new HashMap<Integer, Boolean>();
try {
document = JRXmlUtils.parse(JRLoader.getLocationInputStream(sourceFileId + ".xml"));
params.put(JRXPathQueryExecuterFactory.PARAMETER_XML_DATA_DOCUMENT, document);
params.put(JRXPathQueryExecuterFactory.XML_DATE_PATTERN, "yyyy-MM-dd");
params.put(JRXPathQueryExecuterFactory.XML_NUMBER_PATTERN, "#,##0.##");
params.put(JRXPathQueryExecuterFactory.XML_LOCALE, Locale.ENGLISH);
params.put(JRParameter.REPORT_LOCALE, Locale.US);
JasperCompileManager.compileReportToFile(templateId + ".jrxml", templateId + ".jasper");
JasperFillManager.fillReportToFile(templateId + ".jasper", params);
JasperExportManager.exportReportToPdfFile(templateId + ".jrprint", sourceFileId + ".pdf");
} catch (Exception e) {
e.printStackTrace();
return renderedSuccessList;
}
return renderedSuccessList;
}
<?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="OrdersReport" pageWidth="500" pageHeight="842" columnWidth="500" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0">
<style name="Sans_Normal" isDefault="true" fontName="DejaVu Sans" fontSize="8" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
<style name="Sans_Bold" isDefault="false" fontName="DejaVu Sans" fontSize="8" isBold="true" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
<style name="Sans_Italic" isDefault="false" fontName="DejaVu Sans" fontSize="8" isBold="false" isItalic="true" isUnderline="false" isStrikeThrough="false"/>
<parameter name="CustomerID" class="java.lang.String"/>
<queryString language="xPath"><![CDATA[/Northwind/Orders[CustomerID='$P{CustomerID}']]]></queryString>
<field name="Id" class="java.lang.String">
<fieldDescription><![CDATA[OrderID]]></fieldDescription>
</field>
<field name="OrderDate" class="java.util.Date">
<fieldDescription><![CDATA[OrderDate]]></fieldDescription>
</field>
<field name="ShipCity" class="java.lang.String">
<fieldDescription><![CDATA[ShipCity]]></fieldDescription>
</field>
<field name="Freight" class="java.lang.Float">
<fieldDescription><![CDATA[Freight]]></fieldDescription>
</field>
<variable name="TotalFreight" class="java.lang.Float" calculation="Sum">
<variableExpression><![CDATA[$F{Freight}]]></variableExpression>
</variable>
<pageHeader>
<band height="14">
<frame>
<reportElement x="0" y="2" width="356" height="10" forecolor="#ccffff" backcolor="#ccffff" mode="Opaque"/>
<staticText>
<reportElement mode="Opaque" x="0" y="0" width="48" height="10" backcolor="#ccffff" style="Sans_Bold"/>
<textElement textAlignment="Right"/>
<text><![CDATA[ID]]></text>
</staticText>
<staticText>
<reportElement mode="Opaque" x="54" y="0" width="87" height="10" backcolor="#ccffff" style="Sans_Bold"/>
<textElement textAlignment="Center"/>
<text><![CDATA[Order Date]]></text>
</staticText>
<staticText>
<reportElement mode="Opaque" x="146" y="0" width="108" height="10" backcolor="#ccffff" style="Sans_Bold"/>
<text><![CDATA[Ship City]]></text>
</staticText>
<staticText>
<reportElement mode="Opaque" x="259" y="0" width="92" height="10" backcolor="#ccffff" style="Sans_Bold"/>
<textElement textAlignment="Right"/>
<text><![CDATA[Freight]]></text>
</staticText>
</frame>
</band>
</pageHeader>
<detail>
<band height="14">
<textField>
<reportElement x="0" y="2" width="51" height="10"/>
<textElement textAlignment="Right"/>
<textFieldExpression class="java.lang.String"><![CDATA[$F{Id}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true" pattern="yyyy, MMM dd">
<reportElement positionType="Float" x="54" y="2" width="87" height="10"/>
<textElement textAlignment="Center"/>
<textFieldExpression class="java.util.Date"><![CDATA[$F{OrderDate}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement positionType="Float" x="146" y="2" width="108" height="10"/>
<textElement/>
<textFieldExpression class="java.lang.String"><![CDATA[$F{ShipCity}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true" pattern="¤ #,##0.00">
<reportElement positionType="Float" x="259" y="2" width="92" height="10"/>
<textElement textAlignment="Right"/>
<textFieldExpression class="java.lang.Float"><![CDATA[$F{Freight}]]></textFieldExpression>
</textField>
</band>
</detail>
<summary>
<band height="14">
<frame>
<reportElement x="0" y="2" width="356" height="10" forecolor="#33cccc" backcolor="#33cccc" mode="Opaque"/>
<staticText>
<reportElement mode="Opaque" x="160" y="0" width="67" height="10" backcolor="#33cccc" style="Sans_Bold"/>
<textElement textAlignment="Right"/>
<text><![CDATA[Total :]]></text>
</staticText>
<textField>
<reportElement mode="Opaque" x="259" y="0" width="92" height="10" backcolor="#33cccc" style="Sans_Bold"/>
<textElement textAlignment="Right"/>
<textFieldExpression class="java.lang.Float"><![CDATA[$V{TotalFreight}]]></textFieldExpression>
</textField>
<textField>
<reportElement mode="Opaque" x="227" y="0" width="27" height="10" backcolor="#33cccc" style="Sans_Bold"/>
<textElement textAlignment="Right"/>
<textFieldExpression class="java.lang.Integer"><![CDATA[$V{REPORT_COUNT}]]></textFieldExpression>
</textField>
</frame>
</band>
</summary>
</jasperReport>
<?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="CustomersReport" pageWidth="595" pageHeight="842" columnWidth="515" leftMargin="40" rightMargin="40" topMargin="50" bottomMargin="50">
<style name="Sans_Normal" isDefault="true" fontName="DejaVu Sans" fontSize="12" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
<style name="Sans_Bold" isDefault="false" fontName="DejaVu Sans" fontSize="12" isBold="true" isItalic="false" isUnderline="false" isStrikeThrough="false"/>
<style name="Sans_Italic" isDefault="false" fontName="DejaVu Sans" fontSize="12" isBold="false" isItalic="true" isUnderline="false" isStrikeThrough="false"/>
<queryString language="xPath"><![CDATA[/Northwind/Customers]]></queryString>
<field name="CustomerID" class="java.lang.String">
<fieldDescription><![CDATA[CustomerID]]></fieldDescription>
</field>
<field name="CompanyName" class="java.lang.String">
<fieldDescription><![CDATA[CompanyName]]></fieldDescription>
</field>
<title>
<band height="50">
<line>
<reportElement x="0" y="0" width="515" height="1"/>
<graphicElement/>
</line>
<staticText>
<reportElement x="0" y="10" width="515" height="30" style="Sans_Normal"/>
<textElement textAlignment="Center">
<font size="22"/>
</textElement>
<text><![CDATA[Customer Orders Report]]></text>
</staticText>
</band>
</title>
<pageHeader>
<band height="21">
<staticText>
<reportElement mode="Opaque" x="0" y="5" width="515" height="15" forecolor="#ffffff" backcolor="#333333" style="Sans_Bold"/>
<text><![CDATA[Customer Order List]]></text>
</staticText>
</band>
</pageHeader>
<detail>
<band height="50">
<textField>
<reportElement x="5" y="5" width="100" height="15" isPrintWhenDetailOverflows="true" style="Sans_Bold"/>
<textFieldExpression class="java.lang.String"><![CDATA[$F{CustomerID}]]></textFieldExpression>
</textField>
<staticText>
<reportElement isPrintRepeatedValues="false" x="404" y="5" width="100" height="15" isPrintWhenDetailOverflows="true" style="Sans_Bold"/>
<text><![CDATA[(continued)]]></text>
</staticText>
<line>
<reportElement x="0" y="20" width="515" height="1" isPrintWhenDetailOverflows="true"/>
<graphicElement/>
</line>
<subreport>
<reportElement isPrintRepeatedValues="false" x="5" y="25" width="507" height="20" isRemoveLineWhenBlank="true" backcolor="#ffcc99"/>
<subreportParameter name="XML_DATA_DOCUMENT">
<subreportParameterExpression>$P{XML_DATA_DOCUMENT}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="XML_DATE_PATTERN">
<subreportParameterExpression>$P{XML_DATE_PATTERN}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="XML_NUMBER_PATTERN">
<subreportParameterExpression>$P{XML_NUMBER_PATTERN}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="XML_LOCALE">
<subreportParameterExpression>$P{XML_LOCALE}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="XML_TIME_ZONE">
<subreportParameterExpression>$P{XML_TIME_ZONE}</subreportParameterExpression>
</subreportParameter>
<subreportParameter name="CustomerID">
<subreportParameterExpression>$F{CustomerID}</subreportParameterExpression>
</subreportParameter>
<subreportExpression class="java.lang.String"><![CDATA["OrdersReport.jasper"]]></subreportExpression>
</subreport>
<textField>
<reportElement x="109" y="5" width="291" height="15" isPrintWhenDetailOverflows="true" style="Sans_Bold"/>
<textFieldExpression class="java.lang.String"><![CDATA[$F{CompanyName}]]></textFieldExpression>
</textField>
</band>
</detail>
<pageFooter>
<band height="40">
<line>
<reportElement x="0" y="10" width="515" height="1"/>
<graphicElement/>
</line>
<textField>
<reportElement x="200" y="20" width="80" height="15"/>
<textElement textAlignment="Right"/>
<textFieldExpression class="java.lang.String"><![CDATA["Page " + String.valueOf($V{PAGE_NUMBER}) + " of"]]></textFieldExpression>
</textField>
<textField evaluationTime="Report">
<reportElement x="280" y="20" width="75" height="15"/>
<textElement/>
<textFieldExpression class="java.lang.String"><![CDATA[" " + String.valueOf($V{PAGE_NUMBER})]]></textFieldExpression>
</textField>
</band>
</pageFooter>
</jasperReport>
答案 0 :(得分：2)
好的，所以我发现了这个问题并且它有点奇怪，因为编译模板的其他方法并不需要采用相同的方法。
上面的示例使用嵌套报表，出于某种原因，运行时编译选项要求您单独编译两个模板，而不是仅编译Super报表，Jasper选择子报表默认 - 就像编译时的情况一样来自蚂蚁脚本。
所以要使上面的代码行：
JasperCompileManager.compileReportToFile(templateId + ".jrxml", templateId + ".jasper");
需要包含在报告所需的每个模板（超级和子级）中。
答案 1 :(得分：0)
问题在于： document = JRXmlUtils.parse（JRLoader.getLocationInputStream（sourceFileId +“。xml”））;
API说： getLocationInputStream
public static java.io.InputStream getLocationInputStream（java.lang.String location） 抛出JRException
Tries to open an input stream for a location.
The method tries to interpret the location as a file name, a resource name or an URL. If any of these succeed, an input stream is created and returned.
Parameters:
location - the location
Returns:
an input stream if the location is an existing file name, a resource name on the classpath or an URL or null otherwise.
Throws:
JRException
如果方法无法返回输入流，则返回null。基本上，您作为参数传递的字符串不正确。尝试传递绝对路径。