使用JrimageLoader.LoadAwTimageFromBytes方法加载图像时获取错误

Question

我正在使用JasperSoft Studio 6.8.0，我遇到了一个困难的错误：

我的Java类有一个logo属性envparameter。

net.sf.jasperreports.engine.util.JRImageLoader.loadAwtImageFromBytes($P{EnvParameter}.logo)

net.sf.jasperreports.engine.util.JRImageLoader.loadAwtImageFromBytes($P{EnvParameter}.getLogo())

但是我在运行时出现了这个错误（编译就可以了）：

net.sf.jasperReports.engine.fill.jrexpressionevalexception：在net.sf.jasperReports.engine.fill.jrexpressionevalception为源文本计算表达式时出错：net.sf.jasperReports.engine.util.jrimageLoader.loadawtimageFrombytes($P{EnvParameter}.logo）在net.sf.jasperReports.engine.fill.jrevaluator.handleEvaluationException（.jrcalculator.evaluate（jrcalculator.java:672)在net.sf.jasperreports.engine.fill.jrcalculator.evaluate（jrcalculator.java:640)在net.sf.jasperreports.engine.fill.jrfillelement.evaluate（jrcalculator.java:640)在net.sf.jasperreports.engine.fill.jrfillelement.evaluateExpression（jrfillelement.javuateExpression（.java：383）在NET。net.sf.jasperReports.engine.fill.jrfillBand.Evaluate(jrfillBand.java:548)在net.sf.jasperReports.engine.fill.jrverticalFiller.filltitle(jrverticalFiller.java:323)在net.sf.jasperReports.engine.fill.jrverticalFiller.jillReport(jrverticalFiller.java:150)在fill.jrfillsubreport.fillsubreport.java:814)在net.sf.jasperreports.engine.fill.jrsubreportTrunnable.run(jrsubreportTrunnable.java:61)在net.sf.jasperreports.engine.fill.AbstractThreadSubreportTrunner.run(AbstractThreadSubreportTrunner.run(AbstractThreadSubreportTrunner.java:221)在45）原因：groovy.lang.MissingMethodException：方法没有签名：static net.sf.jasperreports.engine.util.jrimageLoader.loadAwtImageFromBytes（）适用于参数类型:([b)值:[[-119,80,78,71,13,10,26,10,0,0,0,13,73,72,68,...]]可能的解决方案：在groovy.lang.MetaclasSimple.InvokEstaticMissingMethod(MetaclasSimple.java:1518)在groovy.lang.MetaclasSimple.InvokEstaticMethod(MetaclasSimple.java:1504)在e.java:52)在org.codehaus.groovy.runtime.callsite.callsite.defaultCall(callsitearray.java:47)在org.codehaus.groovy.runtime.callsite.abstractCallsite.call(abstractCallsite.java:116)在org.codehaus.groovy.runtime.callsite.abstractCallsite.call(abstractCallsite.java:116)在rptvtitolo_1558437271760_434544.revaluator.java:302)...17个公共帧省略了mag 21,2019年下午1:17:36 org.apache.catalina.core.standardwrappervalve调用

Answer 1

看来您使用了错误的方法来加载图像。JRImageLoader类在迁移到6.x版本的engine时发生了更改，并且在新版本的JasperReports中，这个类没有静态方法loadAwtImageFromBytes(Bytep[])（我相信在JR 5.5.0中有）。

你可以试试这个小例子。

用于测试的小Bean：

package ru.alex.model;

public class MyBean {

    private byte[] logo;

    public byte[] getLogo() {
        return logo;
    }

    public void setLogo(byte[] logo) {
        this.logo = logo;
    }
}

<?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="ImageExample" pageWidth="612" pageHeight="792" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20">
    <parameter name="mybean" class="ru.alex.model.MyBean" isForPrompting="false"/>
    <title>
        <band height="72">
            <image>
                <reportElement x="200" y="10" width="50" height="50"/>
                <imageExpression><![CDATA[net.sf.jasperreports.engine.util.JRImageLoader.getInstance(DefaultJasperReportsContext.getInstance()).loadAwtImageFromBytes($P{mybean}.getLogo())]]></imageExpression>
            </image>
        </band>
    </title>
</jasperReport>

JasperReport jasperReport;
try (InputStream inputStream = JRLoader.getResourceInputStream("image.jrxml")) {
    jasperReport = JasperCompileManager.compileReport(JRXmlLoader.load(inputStream));
}
Map<String, Object> params = new HashMap<>();
MyBean myBean = new MyBean();

File file = new File(getClass().getClassLoader().getResource("smile.jpg").getFile());
myBean.setLogo(Files.readAllBytes(file.toPath()));

params.put("mybean", myBean);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, new JREmptyDataSource());

SimplePdfExporterConfiguration configuration = new SimplePdfExporterConfiguration();
File outputFile = new File("output.pdf");
try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
     OutputStream fileOutputStream = new FileOutputStream(outputFile)) {
    JRPdfExporter exporter = new JRPdfExporter();
    exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
    exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(byteArrayOutputStream));
    exporter.setConfiguration(configuration);
    exporter.exportReport();
    byteArrayOutputStream.writeTo(fileOutputStream);
}

生成的报告如下所示：