Spring中数据库驱动的资源包 [英] Database-driven resource bundle in Spring

问题描述

我无法使数据库驱动的资源束"正常工作.在下面的示例中，在应用程序启动期间正确插入了TextDAO，但是当访问messageSource时，将创建一个新的Messages对象-就是这一点.如何进行这项工作?

I have problem to make "database-driven resource bundle" work. In example below TextDAO is properly injected during application start, but when messageSource is accessed, a new Messages object is created - that's the point. How to make this work ?

<!-- 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

如Bozho所示，我按如下所示进行了资源捆绑，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.

---

RE-OPEN

As Bozho suggest i did my resource bundle as below, but have problem to dynamically reload it. I suppose that ReloadableResourceBundleMessageSource is for properties files, but maybe it is possible to work this, too.

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;
    }
}

推荐答案

basename是字符串，因此它不是spring bean，因此没有注入.

basename is a string, so it is not a spring bean, and hence no injection there.

您可以尝试做的是继承ReloadableResourceBundleMessageSource的子类，并在那里重写某些方法(例如-getMessage(..)). DAO应该被注入到子类中.

What you can try to do is to subclass ReloadableResourceBundleMessageSource and override some methods there (for example - getMessage(..)). The DAO should be injected in the subclass.

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