为什么在Linux下用PDF截断文本？ [英] Why is text truncated in PDF with Linux?

问题描述

我试着格式化

使用Linux的结果：

PDF属性：
$ b 所有生成的PDF文件在Acrobat Reader for Windows中都具有相同的字体属性：

http://community.jaspersoft.com/问题/ 803503 /为什么文本提交的价值，将待截断，如果-application-running-linux

解决方法似乎是嵌入字体，但是不起作用。

我使用字体Helvetica，这是默认字体之一，这就是原因，请参阅

和 https://stackoverflow.com/a/27345103/5277820 ：

如果您在iText中使用这些字体，iText将忽略嵌入参数，因为假定Adobe Reader和其他查看器可以正确呈现这些字体是安全的。
< blockquote>

问题：

为什么Windows和Linux有相同的字体宽度？或为什么文本截断和/或换行不同？

解决方案

要正确计算字体度量，字体需要可用于Java的虚拟macchine。

看到这个历史问题：

然而，使用jasper-reports的正确解决方案是使用字体扩展 如果使用分布式<$ c $它包含了这些字体：

DejaVu Sans
DejaVu Serif< / code> DejaVu Sans Mono

您需要在字体名称 fontName =DejaVu中使用其中的一个Sans，没有自动映射到其他字体，jar实际上只包含这些 .ttf ，没有其他的（打开jar和验证不同版本的jasper-reports）。

因此只有安装在电脑上的字体或如果您需要其他字体，最好的解决办法是生成自己的字体扩展名，包括有效的 .ttf 字体，这可以在IDE中完成。

I try to format a Date in Jasper Reports and it works with Windows but not with Linux. With Linux the resulting text is truncated.

Code:

JRXML:

<parameter name="timestamp" class="java.util.Date"/>
[...]
<textField>
    <reportElement x="0" y="0" width="50" height="16" uuid="0007846a-26f1-457a-a198-67a2f7c8417c">
        <property name="local_mesure_unitwidth" value="pixel"/>
        <property name="com.jaspersoft.studio.unit.width" value="px"/>
        <property name="local_mesure_unitx" value="pixel"/>
        <property name="com.jaspersoft.studio.unit.x" value="px"/>
        <property name="local_mesure_unity" value="pixel"/>
        <property name="com.jaspersoft.studio.unit.y" value="px"/>
        <property name="local_mesure_unitheight" value="pixel"/>
        <property name="com.jaspersoft.studio.unit.height" value="px"/>
    </reportElement>
    <box padding="2"/>
    <textElement textAlignment="Left" verticalAlignment="Top">
        <font size="8" pdfFontName="Helvetica" pdfEncoding="Cp1250" isPdfEmbedded="true"/>
    </textElement>
    <textFieldExpression><![CDATA[DATEFORMAT($P{timestamp},"dd.MM HH:mm")]]></textFieldExpression>
</textField>

Maven dependencies:

<dependency>
    <groupId>net.sf.jasperreports</groupId>
    <artifactId>jasperreports</artifactId>
    <version>5.6.0</version>
</dependency>
<dependency>
    <groupId>net.sf.jasperreports</groupId>
    <artifactId>jasperreports-functions</artifactId>
    <version>5.6.0</version>
</dependency>

Java:

private byte[] createPdf() {

    try {
        InputStream is = getClass().getResourceAsStream("MyReport.jasper");
        JasperReport jasperReport = (JasperReport) JRLoader.loadObject(is);
        Map<String, Object> parameters = new HashMap<String, Object>();
        parameters.put("timestamp", new Date());
        JRDataSource jrDataSource = new JRBeanCollectionDataSource(new Vector(), false);
        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, jrDataSource);
        byte[] pdf = JasperExportManager.exportReportToPdf(jasperPrint);
        return pdf;
    } catch (JRException e) {
        throw new RuntimeException("Could not create PDF.", e);
    }
}

Results:

Result with Windows:

Result with Linux:

PDF properties:

Both generated PDF files have the same font properties in Acrobat Reader for Windows:

As you can see, the font is not embedded. (Second font "Helvetica" disappears if I add dependency jasperreports-fonts and remove attributes pdfFontName, pdfEncodingand isPdfEmbedded).

Research:

I read:

• PDF generated with jasperreport not showing well on Linux but yes on Mac, could the os be related?
• http://community.jaspersoft.com/questions/527138/pdf-text-truncated-linux-fine-windows
• http://community.jaspersoft.com/questions/803503/why-text-filed-value-will-be-truncated-if-application-running-linux

and the solution seems to be to embed the font, but it doesn't work.

I use font "Helvetica" which is one of the default fonts and that's the reason, see Wikipedia:

These fonts, or suitable substitute fonts with the same metrics, must always be available in all PDF readers and so need not be embedded in a PDF

and https://stackoverflow.com/a/27345103/5277820:

If you use these fonts in iText, iText will ignore the embedded parameter, because it is safe to assume that Adobe Reader and other viewers can render these fonts correctly.

Question:

Why have the same font different widths with Windows and Linux? Or why is the text truncating and/or line wrapping different?

解决方案

To calculate the font-metrics correctly, the font needs to be available to the java virtual macchine.

See this historical question: Font is not available to the JVM with Jasper Reports, that show various solution to the old error launched

However the correct solution with jasper-reports is to use font-extensions

If you use the distributed jasperreports-font.jar it contains these fonts:

DejaVu Sans
DejaVu Serif
DejaVu Sans Mono

You need to use one of these in font name example fontName="DejaVu Sans", there is no automatic mapping to other fonts, the jar physically contains only these .ttf and no other (open jar and verify for different version of jasper-reports).

Hence only font installed on the pc or included in font-extension are available for the JVM.

If you need other fonts, the best solution is to generate your own font-extension including a valid .ttf font this can be done from within the IDE.

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