Spring JasperReports Images Location

JasperReport requires (by default) that images be in "WEB-INF/classes/". I'd like to share images between PDFs and normal JSP pages. I'd rather not clutter up classpath with garbage image files. How do I force JR to use a different 开发者_StackOverflow社区location for images?

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In my book, Indispensable, I recommend creating the following report parameters:

• ROOT_DIR -- "/reports/"
• IMAGE_DIR -- $P{ROOT_DIR} + "images/"
• STYLE_DIR -- $P{ROOT_DIR} + "styles/"
• SUBREPORT_DIR -- $P{ROOT_DIR} + "subreports/"
• COMMON_DIR -- $P{SUBREPORT_DIR} + "common/"

This allows the images directory to be relative to the ROOT_DIR path. It also allows you to change ROOT_DIR dynamically. The parameters must be declared in their relative order.

In your case, using an absolute path:

• ROOT_DIR -- "/home/user/"
• IMAGE_DIR -- $P{ROOT_DIR} + "Pictures/"

Note that changing between operating systems, directory structures, environments (e.g., migrating to JasperReports Server from JasperReports & JSF) and so forth, can be accomplished without having to modify the report. (Well, some modifications are required for JasperReports Server.)

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Following @Dave's advice I split out the base directory into a Parameter and gave it a default. That way I can specify either an absolute path, classpath or url. Here are the relevant pieces of code:

Controller:

modelMap.put("ROOT_DIR", "/srv/images/");

-Or-

modelMap.put("ROOT_DIR", "http://site.com/images/");

jrxml File:

<parameter name="ROOT_DIR" class="java.lang.String">
    <defaultValueExpression><![CDATA["/home/user/Pictures/"]]></defaultValueExpression>
</parameter>
...
<imageExpression class="java.lang.String">
   <![CDATA[$P{ROOT_DIR}+"leaf_banner_red.png"]]>
</imageExpression>

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Upon further inspection, it doesn't seem like I can set a 'location' for images anywhere but I did find out that you can specify images 1 of 3 ways:

• Classpath: "image.png"
• Absolute: "/home/user/Pictures/image.png"
• Url: "https://encrypted.google.com/images/logos/ssl_ps_logo.png"