blocks|key|216554|text|我不认为有这样的API，因为可以动态创建新的有效区域设置对象：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|216555|Locale+locale+=+new+Locale("abcd");|code-block|syntax|javascript|216556|而不需要在某个地方注册。然后，您可以不受限制地使用资源包widget_abcd.properties：|offset|length|style|CODE|216557|ResourceBundle+resource=+ResourceBundle.getBundle("widget",+new+Locale("abcd"));|216558|在java.util.Locale应用编程接口文档中：|216559|216560|因为区域设置对象只是一个区域的标识符，所以在构造区域设置时不会执行有效性检查。如果要查看特定资源是否可用于您构造的区域设置，则必须查询这些资源。|blockquote|216561|216562|216563|要解决这个问题，您仍然可以遍历资源目录中所有名为"widget_“的文件，并发现新添加的资源包。|216564|请注意，由于上述原因，Locale.getAvailableLocales()+不能100%25确定：您可能会在某一天定义一个非标准的语言环境。但是，如果只添加几个标准区域设置，则可以使用此静态方法遍历系统区域设置并获得相应的包。|BOLD|216565|entityMap^0|0|0|S|M|0|0|1|G|0|0|0|0|0|0|B|S|14|8|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|15|8|@$I|16|J|17|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|19|8|@$I|1A|J|1B|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|1D|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1G|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1H|8|@$I|1I|J|1J|K|L]|$I|1K|J|1L|K|10]]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|12|$]]

I don't think there is an API for this because new valid locale objects can be created on the fly: 

<pre><code>Locale locale = new Locale("abcd");
</code></pre>

without the need to register it somewhere. And then you can use a resource bundle 
<code>widget_abcd.properties</code> without restrictions: 

<pre><code>ResourceBundle resource= ResourceBundle.getBundle("widget", new Locale("abcd"));
</code></pre>

From the <code>java.util.Locale</code> API docs:

<blockquote>
 Because a Locale object is just an identifier for a region, no
 validity check is performed when you construct a Locale. If you want
 to see whether particular resources are available for the Locale you
 construct, you must query those resources.
</blockquote>

To solve the problem you can still iterate over all files called "widget_" in the resource directory and discover the new added resource bundles.

Note that <code>Locale.getAvailableLocales()</code> is not 100% sure for the above reason: you might some day define a non standard locale. But if you'll add only a few standard locales you can use this static method to iterate over the system locales and get the corresponding bundles.

blocks|key|216827|text|如果你能做两个基本假设：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|216828|1)您有一个没有区域设置的默认资源包，或者至少有一个您知道的区域设置。|216829|2)您的所有资源都在同一位置(即单个jar文件中的相同路径)|216830|然后，您可以获取单个资源的URL：|216831|URL+url+=+SomeClass.class.getClassLoader().getResource("widget.properties");|code-block|syntax|javascript|216832|一旦有了这些，您就应该能够解析URL了。|216833|如果您使用commons-vfs，您应该能够将URL转换为FileObject：|216834|FileSystemManager+manager+=+VFS.getManager();
FileObject+resource+=+manager.resolveFile(url.toExternalForm());
FileObject+parent+=+resource.getParent();
FileObject+children[]+=+parent.getChildren();
//+figure+out+which+ones+are+bundles,+and+parse+the+names+into+a+list+of+locales.|216835|这将为您省去处理jar:+style+url之类的复杂性的麻烦，因为vfs将为您处理这些问题。|216836|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|J|7|13|8|@]|9|@]|A|$K|L]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

If you can make two basic assumptions:

1) You have a default resource bundle with no locale, or at least one locale that you know is there. 

2) All your resources are in the same location (ie. the same path within a single jar file)

Then you can get the URL for a single resource:

<pre><code>URL url = SomeClass.class.getClassLoader().getResource("widget.properties");
</code></pre>

once you have that, you should be able to parse the URL.

If you use commons-vfs, you should be able to convert the URL into a FileObject:

<pre><code>FileSystemManager manager = VFS.getManager();
FileObject resource = manager.resolveFile(url.toExternalForm());
FileObject parent = resource.getParent();
FileObject children[] = parent.getChildren();
// figure out which ones are bundles, and parse the names into a list of locales.
</code></pre>

This will save you the trouble of dealing with the complexities of jar: style url's and such,
since vfs will handle that for you.

blocks|key|218778|text|A通过列出文件来解决它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218779|public+class+JavaApplication1+{

++++public+static+final+ArrayList<String>+LOCALES+=+new+ArrayList<>();

++++static+{
++++++++try+{
++++++++++++File+f+=+new+File(JavaApplication1.class.getResource("/l10n").toURI());
++++++++++++final+String+bundle+=+"widget_";//+Bundle+name+prefix.
++++++++++++for+(String+s+:+f.list(new+FilenameFilter()+{
++++++++++++++++@Override
++++++++++++++++public+boolean+accept(File+dir,+String+name)+{
++++++++++++++++++++return+name.startsWith(bundle);
++++++++++++++++}
++++++++++++}))+{
++++++++++++++++LOCALES.add(s.substring(bundle.length(),+s.indexOf('.')));
++++++++++++}
++++++++}+catch+(URISyntaxException+x)+{
++++++++++++throw+new+RuntimeException(x);
++++++++}
++++++++LOCALES.trimToSize();
++++}

++++...

}|code-block|syntax|javascript|218780|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

A solve it by listing files.

<pre><code>public class JavaApplication1 {

 public static final ArrayList&lt;String&gt; LOCALES = new ArrayList&lt;&gt;();

 static {
 try {
 File f = new File(JavaApplication1.class.getResource("/l10n").toURI());
 final String bundle = "widget_";// Bundle name prefix.
 for (String s : f.list(new FilenameFilter() {
 @Override
 public boolean accept(File dir, String name) {
 return name.startsWith(bundle);
 }
 })) {
 LOCALES.add(s.substring(bundle.length(), s.indexOf('.')));
 }
 } catch (URISyntaxException x) {
 throw new RuntimeException(x);
 }
 LOCALES.trimToSize();
 }

 ...

}
</code></pre>

I have some resource bundles packaged in my main jar 

<pre><code>widget_en.properties
widget_de.properties
</code></pre>

I retrieve a resource bundle based on my default locale as folows

<pre><code>ResourceBundle.getBundle("widget", Locale.getDefault());
</code></pre>

But I want to present the user with a list of available languages supported so that can select a language that may be different to their computers default

But I can't find a method in ResourceBundle that would list available locales, I don't want to hardcode a list as I may forget to update it when another resource bundle is added.

EDIT

As I only resource bundles for different language (I dont have country refinements) so I have got generated a list by iterating through all the known language codes and check for each one as a resource.

<pre><code>String[]langs = Locale.getISOLanguages();
for(String lang:langs)
{
 URL rb = ClassLoader.getSystemResource("widget_"+lang+".properties");
 if(rb!=null)
 {
 System.out.println("Found:"+rb.toString());
 }
}
</code></pre>

In Java how do I find out what languages I have available my Resource Bundle

我在我的主jar中打包了一些资源包widget_en.propertieswidget_de.properties我根据我的默认语言环境检索资源包，如下所示ResourceBundle.getBundle("widget", Locale.getDefault());但我想向用户提供一个支持的可用语言列表，以便选择一种...

问在Java中，我如何找到我的资源包中可用的语言
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