xml – 在Spring 3中注册带注释的转换器和converterFactories

您只需要一个自定义限定符注释(让我们称之为@AutoRegistered)和某种类型的Converter / Formatter Registrar(实现FormatterRegistrar),它使用这个@AutoRegistered注释注册所有Spring Bean(以及一些xml来注册此注册服务).

然后你需要用这个注释(以及其他一些注释来注释你的对流器)
一个春天的豆子)就是这样.

@AutoRegistered注释：

@Target({ ElementType.FIELD,ElementType.PARAMETER,ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface AutoRegistered {}

报名服务：

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.convert.converter.Converter;
import org.springframework.format.FormatterRegistrar;
import org.springframework.format.FormatterRegistry;

public class AutoregisterFormatterRegistrar implements FormatterRegistrar {

    /**
     * All {@link Converter} Beans with {@link AutoRegistered} annotation.
     * If spring does not find any matching bean,then the List is {@code null}!.
     */
    @Autowired(required = false)
    @AutoRegistered
    private List<Converter<?,?>> autoRegisteredConverters;


    @Override
    public void registerFormatters(final FormatterRegistry registry) {
        if (this.autoRegisteredConverters != null) {
            for (Converter<?,?> converter : this.autoRegisteredConverters) {
                registry.addConverter(converter);
            }
        }
    }
}

注册商的XML配置：

<bean id="applicationConversionService"
    class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
    <property name="formatterRegistrars">
        <set>
            <bean
                class="AutoregisterFormatterRegistrar"
                autowire="byType" />
        </set>
    </property>
</bean>

BTW为您的枚举转换器,您不需要ConversionFactory – 一个简单的转换器就足够了：

@AutoRegistered
@Component
public class EnumConverter implements Converter<Enum<?>,String> {

    /** Use the same immutable value instead of creating an new array every time. */
    private static final Object[] NO_PARAM = new Object[0];

    /** The prefix of all message codes. */
    private static final String PREFIX = "label_";

    /** The separator in the message code,between different packages
        as well as between package can class. */
    private static final String PACKAGE_SEPARATOR = "_";

    /** The separator in the message code,between the class name
        and the enum case name. */
    private static final String ENUM_CASE_SEPARATOR = "_";

    /** The message source. */
    private MessageSource messageSource;

    @Autowired
    public EnumConverter(final MessageSource messageSource) {
        if (messageSource == null) {
            throw new RuntimeException("messageSource must not be null");
        }

        this.messageSource = messageSource;
    }

    @Override
    public String convert(final Enum<?> source) {
        if (source != null) {
            String enumValueName = source.name();
            String code = PREFIX + source.getClass().getName().toLowerCase().
                  replace(".",PACKAGE_SEPARATOR)
            + ENUM_CASE_SEPARATOR + enumValueName.toLowerCase();

            String message = messageSource.getMessage(code,NO_PARAM,enumValueName,LocaleContextHolder.getLocale());

             return message;
         } else {
            return "";
         }
     }   
}