我有一个带有 glassfish 3.1 + JSF for jasperreport 4.0.1 的 EJB 站点。该站点在流式传输 pdf 上没有问题，但是在使用 runReportToPdfStream 打印 PDF 时会生成空白 PDF，下面是代码片段:

EJB

public class BookEJB {  
    public void printReport() throws ClassNotFoundException, IOException, JRException {
        Map parameterMap = new HashMap();

        FacesContext ctx = FacesContext.getCurrentInstance();
        HttpServletResponse response = (HttpServletResponse) ctx.getExternalContext().getResponse();
        InputStream reportStream = ctx.getExternalContext().getResourceAsStream("/reports/test.jasper");

        ServletOutputStream servletOutputStream = response.getOutputStream();
        servletOutputStream.flush();

        response.setContentType("application/pdf");
        JasperRunManager.runReportToPdfStream(reportStream, servletOutputStream, parameterMap);

        servletOutputStream.flush();
        servletOutputStream.close();
        ctx.responseComplete();
}}

test.jrxml - 没有SQL连接的简单报告

<?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="test" pageWidth="800" pageHeight="1200" columnWidth="555" leftMargin="25" rightMargin="25" topMargin="30" bottomMargin="30">
    <property name="ireport.zoom" value="1.0"/>
    <property name="ireport.x" value="0"/>
    <property name="ireport.y" value="0"/>
    <queryString>
        <![CDATA[]]>
    </queryString>
    <pageHeader>
        <band height="100">
            <staticText>
                <reportElement x="0" y="0" width="285" height="36"/>
                <textElement>
                    <font size="24" isBold="true"/>
                </textElement>
                <text><![CDATA[Report of Testing]]></text>
            </staticText>   
        </band>
    </pageHeader>
    <detail>
        <band height="200">
            <staticText>
                <reportElement x="0" y="0" width="374" height="48"/>
                <textElement>
                    <font size="18"/>
                </textElement>
                <text><![CDATA[If you don't see this, it didn't work blah blah blah.... ]]></text>
            </staticText>
        </band>
    </detail>
    <pageFooter>
        <band height="100"/>
    </pageFooter>
</jasperReport>

在 JSF 上生成此报告时，glassfish 中没有错误日志，但仅显示空白 PDF。请帮忙，如果您需要更多信息进行分析，请告诉我。

史蒂文

最佳答案

毕竟，JasperRunManager.runReportToPdfStream(reportStream, servletOutputStream, parameterMap, new JREmptyDataSource());解决了问题。

引自 Jasperreport 的 Sanda:

By default, when no datasource info is present in a report, JR generates no pages. Another option (which can be set in the report's whenNoDataType attribute) would be to print all report sections, excepting the <detail>.

This report contains a detail section, but only with some static data. To ensure this section will be printed too, the simplest way is to provide an empty data source, containing a single empty record.

来源:https://community.jaspersoft.com/questions/537650/blank-pdf-even-simplest-jrxml

关于java - 即使是最简单的 Jasperreport jrxml 也是空白 PDF，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5258307/