從類路徑加載 ResourceBundle

Question

我有兩個 jar 文件。 其中一個 jar 需要從另一個 jar 中讀取語言包。 這是兩個罐子的基本結構

jar1    
   |--com.example.BundleLoader 

jar2
   |--strings
         |--language.properties
         |--language_fr.properties

語言包在類路徑上。 為了通過 BundleLoader 讀取語言包，我嘗試將 ResourseBundle 與 ClassLoader 結合使用。 這就是我嘗試這樣做的方式

private ResourceBundle englishStrings = null;
private ResourceBundle frenchStrings = null;

System.out.println("About to load url from classpath for properties file " + bundleLocation);
URL url = ClassLoader.getSystemResource(bundleLocation);
bundleLocation = url.toString();
System.out.println("Ok loaded it");
System.out.println("url is " + (url == null ? "not available" : url.toString())); // Got the folder location

try {
    URL[] urls = { new URL(bundleLocation) }; // created array of ULRs to be loaded by URLClassLoader
    englishStrings = ResourceBundle.getBundle("validationStrings", Locale.getDefault(),
            new URLClassLoader(urls)); // Exception here
    frenchStrings = ResourceBundle.getBundle("validationStrings", Locale.FRENCH, 
            new URLClassLoader(urls));
} catch (MalformedURLException e1) {
    e1.printStackTrace();
}
<--End of Snippet-->

我得到的例外是

java.lang.ExceptionInInitializerError
    at com.example.Model.model.dObject.doCommon(dObject.java:70)
    at com.example.Model.model.dObject.validate(dObject.java:42)
    at com.example.Model.model.test.dObjectTest.testChpValidate(dObjectTest.java:49)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.util.MissingResourceException: Can't find bundle for base name validationStrings, locale en_CA
    at java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:1499)
    at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1322)
    at java.util.ResourceBundle.getBundle(ResourceBundle.java:1028)
    at com.example.util.Strings.<init>(Strings.java:51)
    at com.example.util.Strings.<clinit>(Strings.java:26)
    ... 27 more

基本上，即使屬性文件在文件夾中，我也找不到包。 有沒有人遇到過這個？ 我假設之前有人處理過這個問題。

謝謝。

Answer 1

ResourceBundle.getBundle("validationStrings", Locale.FRENCH)將在類路徑上的任何 JAR 中查找直接位於根目錄下的名為validationStrings_fr.properties的文件。 如果找不到，它將嘗試validationStrings.properties 。

如果您無法更改語言包 JAR 的結構，請嘗試將整個第二個代碼段替換為

this.englishStrings = ResourceBundle.getBundle("strings.language");
this.frenchStrings = ResourceBundle.getBundle("strings.language", Locale.FRENCH);

englishStrings行將查找文件strings/language_en_CA.properties （假設您的默認語言環境是en_CA ），然后在找不到時返回到strings/language.properties 。 frenchStrings行將查找strings/language_fr.properties 。