Java中图像的无文件资源包？

Question

I have a Java (JSF) web application that needs to be localized, including text, images and etc (numbers, dates). I'm trying to have programmers to only use

<h:graphicImage value="#{images['i_print.png']}" ... />

... and have the correct localized image automatically picked in the background, according to the user's locale.

One approach is to have resource bundles property files with different image paths for a certain image key. Is there a way this can be done without property files at all?

I mean.. the images directory having the following structure:

-Images
--en
---en_US
---en_CA
--fr
---fr_FR

Is it possible to create resource bundles where the lookup would go through the most localized directory first and going up the tree until the image name is found?

So far I have the following:

(1) An images handler.

<resource-bundle>
    <base-name>com.example.ImageResourcesHandler</base-name>
    <var>images</var>
</resource-bundle>

(2) The handler implementation, which extends resource bundle and handles the call by overriding getObject

public class ImageResourcesHandler extends ResourceBundle {

@Override
protected Object handleGetObject(String key) {...}


}

(3) An Images Control that extends ResourceBundle.Control and is supposed to the the BundleLoading and control

public class ImageControl extends ResourceBundle.Control { ... }

Right now I go through the images root directory and create a map with the names of images as the key and their path as values.

The problem is I don't have a Bundle structure, meaning that if I have the key in two different locales, my map clearly doesn't work (two+ paths are mapped to the same key).

Do you have any ideas on how to accomplish this? I wouldn't like to maintain properties files.

TL;DR: I would like to implement a mechanism that gets images according to the user's locale from the file system without using properties files.

Any ideas are highly appreciated. Thanks!

Answer 1

JSF has a built-in mechanism to do this: Resources.

A resource is localized by placing it in a directory named /resources/ locale / library in the .war. So your .war might contain these files:

• /resources/images/i_print.png
• /resources/en_UK/images/i_print.png
• /resources/de/images/i_print.png
• /resources/ja/images/i_print.png

…and so on.

For images, this is accessed as <h:graphicImage library="images" name="i_print.png"/> . JSF will automatically select the resources directory based on the locale of the view root.

Stylesheets can be localized in the same way: <h:outputStylesheet library="css" name="apptheme.css"/> .

For resources other than images and stylesheets, JSF provides a built-in EL resolver that treats the identifier resource like a map, whose keys are library + ":" + filename. So page authors could access the above resource as #{resource['images:i_print.png']} , though I think it's far more legible to use the library and name attributes.