我在使“数据库驱动的资源包”工作时遇到问题。在下面的示例中,在应用程序启动期间已正确注入(inject)TextDAO,但是在访问messageSource时,将创建一个新的Messages对象-就是这一点。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>

Messages.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Bozho所建议的那样,我做了如下的资源捆绑,但是在动态重新加载它时遇到了问题。我想ReloadableResourceBundleMessageSource是用于属性文件的,但是也许也可以使用它。
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;
    }
}

最佳答案

basename是一个字符串,因此它不是spring bean,因此在那里没有注入(inject)。

您可以尝试做的是ReloadableResourceBundleMessageSource的子类,并在那里重写一些方法(例如-getMessage(..))。 DAO应该注入(inject)子类中。

09-27 17:25