我无法使“数据库驱动的资源包”工作。在下面TextDAO的示例中，在应用程序启动期间正确注入，但是当messageSource被访问时，Messages会创建一个新对象——这就是重点。如何使这项工作？
<!-- message source -->
<bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="someapp.bundle.Messages" />
</bean>
消息.java
@Component
public class Messages extends ListResourceBundle {
@Autowired
private TextDAO textDAO;
public Messages() {
log.debug("CONSTRUCTOR");
}
@Override
protected Object[][] getContents() {
// loading messages from DB
List<Text> texts = textDAO.findAll(); // textDAO is null
...
}
}
重新打开
正如我所Bozho建议的那样，我做了如下的资源包，但是动态重新加载它有问题。我想 ReloadableResourceBundleMessageSource 是用于属性文件的，但也许也可以这样做。
public class DatabaseDrivenMessageSource extends ReloadableResourceBundleMessageSource {
private Logger log = LoggerFactory.getLogger(getClass());
private final Map<String, Map<String, String>> properties = new HashMap<String, Map<String, String>>();
private TextDAO textDAO;
@Autowired
public DatabaseDrivenMessageSource(TextDAO textDAO) {
this.textDAO = textDAO;
reload();
}
@Override
protected MessageFormat resolveCode(String code, Locale locale) {
String msg = getText(code, locale);
MessageFormat result = createMessageFormat(msg, locale);
return result;
}
@Override
protected String resolveCodeWithoutArguments(String code, Locale locale) {
return getText(code, locale);
}
private String getText(String code, Locale locale) {
Map<String, String> localized = properties.get(code);
String textForCurrentLanguage = null;
if (localized != null) {
textForCurrentLanguage = localized.get(locale.getLanguage());
if (textForCurrentLanguage == null) {
textForCurrentLanguage = localized.get(Locale.ENGLISH.getLanguage());
}
}
return textForCurrentLanguage != null ? textForCurrentLanguage : code;
}
public void reload() {
properties.clear();
properties.putAll(loadTexts());
}
protected Map<String, Map<String, String>> loadTexts() {
log.debug("loadTexts");
Map<String, Map<String, String>> m = new HashMap<String, Map<String, String>>();
List<Text> texts = textDAO.findAll();
for(Text text: texts) {
Map<String, String> v = new HashMap<String, String>();
v.put("en", text.getEn());
v.put("de", text.getDe());
m.put(text.getKey(), v);
}
return m;
}
}