如何使用java配置配置Spring ConversionService？

Question

我有这样的xml:

<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <list>
                <bean class="converters.AddressToStringConverter" />
                <bean class="converters.StringToAddressConverter" />
            </list>
        </property>
    </bean>

它可以毫无问题地配置转换器.

但是这段代码无法做到:

@Configuration
public class ConversionConfiguration {

    @Bean
    public ConversionService getConversionService() {
        ConversionServiceFactoryBean bean = new ConversionServiceFactoryBean();
        bean.setConverters(getConverters());
        bean.afterPropertiesSet();
        ConversionService object = bean.getObject();
        return object;
    }

    private Set<Converter> getConverters() {
        Set<Converter> converters = new HashSet<Converter>();

        converters.add(new AddressToStringConverter());
        converters.add(new StringToAddressConverter());

        return converters;
    }
}

这个配置由上下文扫描 - 我用调试器检查它.哪里可能是问题？

Answer 1

从我的角度来看,你的问题就是这个Bean名字.一旦您没有使用@Bean(name="conversionService")将要使用的名称显式设置名称getConversionService.

来自文档:

此bean的名称,或者如果是复数,则为此bean的别名.如果未指定,则bean的名称是带注释的方法的名称.如果指定,则忽略方法名称.

Answer 2

在SpringMVC中,您可以扩展WebMvcConfigurerAdapter并将其用于基于Java的配置.要注册自定义转换器,您可以像这样修改"addFormatters"-Method

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = { "..." })
public class ApplicationConfiguration extends WebMvcConfigurerAdapter
{
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer)
    {
        configurer.enable();
    }

    @Bean
    public InternalResourceViewResolver getInternalResourceViewResolver()
    {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        return resolver;
    }

    @Override
    public void addFormatters(FormatterRegistry formatterRegistry)
    {
        formatterRegistry.addConverter(getMyConverter());
    }

    @Bean
    public StringToCounterConverter getMyConverter()
    {
        return new StringToCounterConverter();
    }

}