ResourceBundleMessageSource (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.context.support
Class ResourceBundleMessageSource

java.lang.Object
  org.springframework.context.support.AbstractMessageSource
      org.springframework.context.support.ResourceBundleMessageSource

All Implemented Interfaces:: BeanClassLoaderAware, HierarchicalMessageSource, MessageSource

public class ResourceBundleMessageSource
extends AbstractMessageSource
implements BeanClassLoaderAware
extends AbstractMessageSource
implements BeanClassLoaderAware

MessageSource implementation that accesses resource bundles using specified basenames. This class relies on the underlying JDK's ResourceBundle implementation, in combination with the JDK's standard message parsing provided by MessageFormat.

This MessageSource caches both the accessed ResourceBundle instances and the generated MessageFormats for each message. It also implements rendering of no-arg messages without MessageFormat, as supported by the AbstractMessageSource base class. The caching provided by this MessageSource is significantly faster than the built-in caching of the java.util.ResourceBundle class.

Unfortunately, java.util.ResourceBundle caches loaded bundles forever: Reloading a bundle during VM execution is not possible. As this MessageSource relies on ResourceBundle, it faces the same limitation. Consider ReloadableResourceBundleMessageSource for an alternative that is capable of refreshing the underlying bundle files.

Author:: Rod Johnson, Juergen Hoeller
See Also:: setBasenames(java.lang.String[]), ReloadableResourceBundleMessageSource, ResourceBundle, MessageFormat

Field Summary

Fields inherited from class org.springframework.context.support.AbstractMessageSource

logger

Constructor Summary

ResourceBundleMessageSource()


Method Summary

protected ResourceBundle doGetBundle(String basename, Locale locale)
          Obtain the resource bundle for the given basename and Locale.

protected ClassLoader getBundleClassLoader()
          Return the ClassLoader to load resource bundles with.

protected MessageFormat getMessageFormat(ResourceBundle bundle, String code, Locale locale)
          Return a MessageFormat for the given bundle and code, fetching already generated MessageFormats from the cache.

protected ResourceBundle getResourceBundle(String basename, Locale locale)
          Return a ResourceBundle for the given basename and code, fetching already generated MessageFormats from the cache.

protected MessageFormat resolveCode(String code, Locale locale)
          Resolves the given message code as key in the registered resource bundles, using a cached MessageFormat instance per message code.

protected String resolveCodeWithoutArguments(String code, Locale locale)
          Resolves the given message code as key in the registered resource bundles, returning the value found in the bundle as-is (without MessageFormat parsing).

void setBasename(String basename)
          Set a single basename, following ResourceBundle conventions: essentially, a fully-qualified classpath location.

void setBasenames(String[] basenames)
          Set an array of basenames, each following ResourceBundle conventions: essentially, a fully-qualified classpath location.

void setBeanClassLoader(ClassLoader classLoader)
          Callback that supplies the bean class loader to a bean instance.

void setBundleClassLoader(ClassLoader classLoader)
          Set the ClassLoader to load resource bundles with.

String toString()
          Show the configuration of this MessageSource.

Methods inherited from class org.springframework.context.support.AbstractMessageSource

createMessageFormat, formatMessage, getDefaultMessage, getMessage, getMessage, getMessage, getMessageFromParent, getMessageInternal, getParentMessageSource, isAlwaysUseMessageFormat, isUseCodeAsDefaultMessage, renderDefaultMessage, resolveArguments, setAlwaysUseMessageFormat, setParentMessageSource, setUseCodeAsDefaultMessage

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Fields inherited from class org.springframework.context.support.AbstractMessageSource
`logger`

Constructor Summary
`ResourceBundleMessageSource()`

Method Summary
`protected ResourceBundle`	`doGetBundle(String basename, Locale locale)` Obtain the resource bundle for the given basename and Locale.
`protected ClassLoader`	`getBundleClassLoader()` Return the ClassLoader to load resource bundles with.
`protected MessageFormat`	`getMessageFormat(ResourceBundle bundle, String code, Locale locale)` Return a MessageFormat for the given bundle and code, fetching already generated MessageFormats from the cache.
`protected ResourceBundle`	`getResourceBundle(String basename, Locale locale)` Return a ResourceBundle for the given basename and code, fetching already generated MessageFormats from the cache.
`protected MessageFormat`	`resolveCode(String code, Locale locale)` Resolves the given message code as key in the registered resource bundles, using a cached MessageFormat instance per message code.
`protected String`	`resolveCodeWithoutArguments(String code, Locale locale)` Resolves the given message code as key in the registered resource bundles, returning the value found in the bundle as-is (without MessageFormat parsing).
`void`	`setBasename(String basename)` Set a single basename, following `ResourceBundle` conventions: essentially, a fully-qualified classpath location.
`void`	`setBasenames(String[] basenames)` Set an array of basenames, each following `ResourceBundle` conventions: essentially, a fully-qualified classpath location.
`void`	`setBeanClassLoader(ClassLoader classLoader)` Callback that supplies the bean `class loader` to a bean instance.
`void`	`setBundleClassLoader(ClassLoader classLoader)` Set the ClassLoader to load resource bundles with.
`String`	`toString()` Show the configuration of this MessageSource.

Methods inherited from class org.springframework.context.support.AbstractMessageSource
`createMessageFormat, formatMessage, getDefaultMessage, getMessage, getMessage, getMessage, getMessageFromParent, getMessageInternal, getParentMessageSource, isAlwaysUseMessageFormat, isUseCodeAsDefaultMessage, renderDefaultMessage, resolveArguments, setAlwaysUseMessageFormat, setParentMessageSource, setUseCodeAsDefaultMessage`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

ResourceBundleMessageSource

public ResourceBundleMessageSource()

Method Detail

setBasename

public void setBasename(String basename)

Set a single basename, following ResourceBundle conventions: essentially, a fully-qualified classpath location. If it doesn't contain a package qualifier (such as org.mypackage), it will be resolved from the classpath root.

Messages will normally be held in the "/lib" or "/classes" directory of a web application's WAR structure. They can also be held in jar files on the class path.

Parameters:: basename - the single basename
See Also:: setBasenames(java.lang.String[]), ResourceBundle

setBasenames

public void setBasenames(String[] basenames)

Set an array of basenames, each following ResourceBundle conventions: essentially, a fully-qualified classpath location. If it doesn't contain a package qualifier (such as org.mypackage), it will be resolved from the classpath root.

The associated resource bundles will be checked sequentially when resolving a message code. Note that message definitions in a previous resource bundle will override ones in a later bundle, due to the sequential lookup.

Parameters:: basenames - an array of basenames
See Also:: setBasename(java.lang.String), ResourceBundle

setBundleClassLoader

public void setBundleClassLoader(ClassLoader classLoader)

Set the ClassLoader to load resource bundles with.

Default is the containing BeanFactory's bean ClassLoader, or the default ClassLoader determined by ClassUtils.getDefaultClassLoader() if not running within a BeanFactory.

getBundleClassLoader

protected ClassLoader getBundleClassLoader()

Return the ClassLoader to load resource bundles with.

Default is the containing BeanFactory's bean ClassLoader.

See Also:: setBundleClassLoader(java.lang.ClassLoader)

setBeanClassLoader

public void setBeanClassLoader(ClassLoader classLoader)

Description copied from interface: BeanClassLoaderAware

Callback that supplies the bean class loader to a bean instance.

Invoked after the population of normal bean properties but before an initialization callback such as InitializingBean's InitializingBean.afterPropertiesSet() method or a custom init-method.

Specified by:: setBeanClassLoader in interface BeanClassLoaderAware

Parameters:: classLoader - the owning class loader; may be null in which case a default ClassLoader must be used, for example the ClassLoader obtained via ClassUtils.getDefaultClassLoader()

resolveCodeWithoutArguments

protected String resolveCodeWithoutArguments(String code,
                                             Locale locale)

Resolves the given message code as key in the registered resource bundles, returning the value found in the bundle as-is (without MessageFormat parsing).

Overrides:: resolveCodeWithoutArguments in class AbstractMessageSource

Parameters:: code - the code of the message to resolve; locale - the Locale to resolve the code for (subclasses are encouraged to support internationalization)
Returns:: the message String, or null if not found
See Also:: AbstractMessageSource.resolveCode(java.lang.String, java.util.Locale), MessageFormat

resolveCode

protected MessageFormat resolveCode(String code,
                                    Locale locale)

Resolves the given message code as key in the registered resource bundles, using a cached MessageFormat instance per message code.

Specified by:: resolveCode in class AbstractMessageSource

Parameters:: code - the code of the message to resolve; locale - the Locale to resolve the code for (subclasses are encouraged to support internationalization)
Returns:: the MessageFormat for the message, or null if not found
See Also:: AbstractMessageSource.resolveCodeWithoutArguments(String, java.util.Locale)

getResourceBundle

protected ResourceBundle getResourceBundle(String basename,
                                           Locale locale)

Return a ResourceBundle for the given basename and code, fetching already generated MessageFormats from the cache.

Parameters:: basename - the basename of the ResourceBundle; locale - the Locale to find the ResourceBundle for
Returns:: the resulting ResourceBundle, or null if none found for the given basename and Locale

doGetBundle

protected ResourceBundle doGetBundle(String basename,
                                     Locale locale)
                              throws MissingResourceException

Obtain the resource bundle for the given basename and Locale.

Parameters:: basename - the basename to look for; locale - the Locale to look for
Returns:: the corresponding ResourceBundle
Throws:: MissingResourceException - if no matching bundle could be found
See Also:: ResourceBundle.getBundle(String, java.util.Locale, ClassLoader), getBundleClassLoader()

getMessageFormat

protected MessageFormat getMessageFormat(ResourceBundle bundle,
                                         String code,
                                         Locale locale)
                                  throws MissingResourceException

Return a MessageFormat for the given bundle and code, fetching already generated MessageFormats from the cache.

Parameters:: bundle - the ResourceBundle to work on; code - the message code to retrieve; locale - the Locale to use to build the MessageFormat
Returns:: the resulting MessageFormat, or null if no message defined for the given code
Throws:: MissingResourceException - if thrown by the ResourceBundle

toString

public String toString()

Show the configuration of this MessageSource.

Overrides:: toString in class Object