Jasper Reports 5.0.1中的文件解析器

Question

使用5.0.1不推荐使用REPORT_FILE_RESOLVER和示例实现:http: //jasperreports.sourceforge.net/sample.reference/tableofcontents/index.html#fileresolver

声明强烈建议切换到JasperReportsContext.

我找不到任何JasperReportsContext用法的例子.据我所知,我应该寻找具有FileResolver getter和setter的LocalJasperReportsContext.

我问,怎么做呢？

Answer 1

浏览完资源后,我找到了解决方案.

JRXML imageExpression标记:

<band height="79" splitType="Stretch">
<image scaleImage="FillFrame" isLazy="true" onErrorType="Blank">
    <reportElement uuid="3340bf0f-8471-45e9-8ea4-bdf44a7c0e68" x="0" y="0" width="150" height="69"/>
    <imageExpression class="java.io.File"><![CDATA["image.jpg"]]></imageExpression>
</image>

Java代码片段:

FileResolver resolver = new FileResolver() {
@Override
public File resolveFile(String filename) {
    return new File("/some/path");
}
};


InputStream jasperfile = getClass().getClassLoader().getResourceAsStream("file.jasper");

LocalJasperReportsContext ctx = new LocalJasperReportsContext(DefaultJasperReportsContext.getInstance());
ctx.setClassLoader(getClass().getClassLoader());
ctx.setFileResolver(resolver);
JasperReport jasperReport = (JasperReport) JRLoader.loadObject(jasperfile);

JasperFillManager fillmgr = JasperFillManager.getInstance(ctx);
JasperExportManager exmgr = JasperExportManager.getInstance(ctx);

JasperPrint jasperPrint = fillmgr.fill(jasperReport, parameters, beanColDataSource);
ByteArrayOutputStream pdfBytes = new ByteArrayOutputStream();
exmgr.exportToPdfStream(jasperPrint, pdfBytes);

您必须创建一个新的上下文并将其传递给JasperFillManager和JasperExportManager.