External Styles in JasperReports

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I\'m working on a system that includes a large number of reports, generated using JasperReports. One of the newer features is that you can define styles for reports.

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你的背包

2020-12-13 07:53
I like to share my learning of using styles in Jasper reports, which I think quite useful for report designers like me, from a book named JasperReport Development cookbook by Bilal Siddiqui. I like this book and found demonstrating styles in a variety of manner like:
- Creating a reusable style
  Simply select “Style” while creating a new report and define style for text, line and rectangles. The style file will be stored as .jrtx file.
- Import reusable style it in your report
  There are three chunk of information when importing styles in your report. Step1. Name and location of style template
```
<template><![CDATA["C:\\ BigBoldRedTemplate.jrtx"]]></template>
```
Step2. Each time you apply style to your report elements using the style template, a <reportElement> tag is created as shown below:
```
//style applied to a rectangle
<rectangle radius="10">
    <reportElement style="BigBoldRed" mode="Transparent" x="0" y="0" width="555" height="44"/>
</rectangle>
//style applied to a the text field
<staticText>
        <reportElement style="BigBoldRed" x="0" y="0" width="555" height="66"/>
        <textElement textAlignment="Center" verticalAlignment="Middle"/>
        <text><![CDATA[Monthly Customer Invoices]]></text>
</staticText>
```
- Mixing the internal and reusable styles in report
- Using the power of HTML to style your report
  For example, your text field has following expression which includes HTML tags (i.e. <li>) and you want the HTML tags to work in your report design:
```
"<li>"+"Invoice # "+$F{InvoiceID}+", "+
```
$F{CustomerName}+" purchased "+$F{ProductName}+" in "+$F{InvoicePeriod}+" (Invoice value: \$ "+$F{InvoiceValue}+")"+"

Solution is simple, just set “Markup” property of the text field to “Styled” and that it.

I have taken permission from the author to copy code chunk from his JasperReports cookbook in this post.

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心在旅途

2020-12-13 08:06

Use JasperReport templates. A JasperReports template is one that ends in .jrtx, and may look similar to this (styles.jrtx):

<?xml version="1.0"?>
<!DOCTYPE jasperTemplate
  PUBLIC "-//JasperReports//DTD Template//EN"
  "http://jasperreports.sourceforge.net/dtds/jaspertemplate.dtd">

<jasperTemplate>
    <style name="Report Title" isDefault="false" hAlign="Center" fontSize="24" isBold="true"/>
    <style name="Heading 1" isDefault="false" fontSize="18" isBold="true"/>
    <style name="Heading 2" isDefault="false" fontSize="14" isBold="true"/>
</jasperTemplate>

and then in your .jrxml file, include it as a template:

...
<template><![CDATA["styles.jrtx"]]></template>
...

iReport also understands this, so your styles are imported and shown in iReport correctly (though I did notice sometimes it wouldn't pick them up an a reload or recompile was necessary).

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春和景丽

2020-12-13 08:14

You can also avoid specifying the actual file name in the <template> element by using a parameter passed into your report at runtime

<parameter name="TEMPLATE_FILE" isForPrompting="false" class="java.lang.String"/>

<template><![CDATA[$P{TEMPLATE_FILE}]]></template>

where $P{TEMPLATE_FILE} is the full path to the style resource

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