是否有<fmt:message key ="key"/>的简写？

Question

写下这样的事情是很乏味和丑陋的:

<input type="button" value="<fmt:message key="submitKey" />" />

如果您想将消息标记嵌套在另一个标记的属性中,则会变得更糟.

有没有任何简写.例如(在JSF中):

<h:commandButton value="#{msg.shareKey}" />

(适用于spring-mvc的解决方案)

Answer 1

This feels like a bit of a hack, but you could write a custom implementation of java.util.Map which, when get(key) is called, fetches the message from the Spring MessageSource. This Map could be added to the model under the msg key, allowing you to dereference the messages using ${msg.myKey}.

也许还有一些其他的动态结构,而不是JSP EL认可的Map,但我不能想到一个随意的结构.

public class I18nShorthandInterceptor extends HandlerInterceptorAdapter {

    private static final Logger logger = Logger.getLogger(I18nShorthandInterceptor.class);

    @Autowired
    private MessageSource messageSource;

    @Autowired
    private LocaleResolver localeResolver;

    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler) throws Exception {

        request.setAttribute("msg", new DelegationMap(localeResolver.resolveLocale(request)));

        return true;
    }

    private class DelegationMap extends AbstractMap<String, String> {
        private final Locale locale;

        public DelegationMap(Locale locale) {
            this.locale = locale;
        }

        @Override
        public String get(Object key) {
            try {
                return messageSource.getMessage((String) key, null, locale);
            } catch (NoSuchMessageException ex) {
                logger.warn(ex.getMessage());
                return (String) key;
            }
        }
        @Override
        public Set<Map.Entry<String, String>> entrySet() {
            // no need to implement this
            return null;
        }

    }
}

作为备选:

<fmt:message key="key.name" var="var" />

然后${var}用作常规EL.