在spring配置文件中设置资源

Question

我想在spring配置中配置推土机。 当使用xml配置时，它就像

<bean class="org.dozer.spring.DozerBeanMapperFactoryBean">
    <property name="mappingFiles" value="classpath*:dozer/**/*.dzr.xml"/>
</bean>

如何在配置文件中定义资源。 我尝试使用ctx.getResource()但我无法访问Configuration类中的ApplicationContext。

我尝试了ContextRefreshedEvent并从那里添加资源，但仍然没有运气。 （已调用afterPropertiesSet并且添加的映射不起作用）

public class ContextRefreshedEventBuilder extends ContextRefreshedEvent {
public ContextRefreshedEventBuilder(ApplicationContext ctx) {
    super(ctx);
    DozerBeanMapperFactoryBean mapper = ctx.getBean(DozerBeanMapperFactoryBean.class);
    try {
        mapper.setMappingFiles(ctx.getResources("classpath*:dozer/**/*.dzr.xml"));
    } catch (IOException e) {
        e.printStackTrace();
    }
}
}

还尝试使用ClassPathResource但无法找到正确的方法

DozerBeanMapperFactoryBean mapper = new DozerBeanMapperFactoryBean();
mapper.setMappingFiles(new Resource[]{new ClassPathResource("classpath*:dozer/**/*.dzr.xml")});
return mapper;

如何将ClassPathResource添加为映射位置？

- -回答 - -

@Bean
public DozerBeanMapperFactoryBean configDozer() throws IOException {
    DozerBeanMapperFactoryBean mapper = new DozerBeanMapperFactoryBean();
    Resource[] resources = new PathMatchingResourcePatternResolver().getResources("classpath*:dozer/**/*.dzr.xml");
    mapper.setMappingFiles(resources);
    return mapper;
}

Answer 1

您需要使用ResourcePatternResolver将classpath*:dozer/**/*.dzr.xml转换为Resource[] 。 您可以使用2种主要选项。

1. 将ApplicationContext注入配置类，将其getResources转换为ResourcePatternResolver并使用getResources方法。 Al Spring默认应用程序上下文实现实现ResourcePatternResolver接口。
2. 使用或不使用前面提到的上下文创建PathMatchingResourcePatternResolver 。
3. 使用ResourcePatternUtils与注入ResourceLoader 。

使用ResourcePatternUtils

@Configuration
public class MyConfiguration {

    @Autowired
    private ResourceLoader resourceLoader;

    public DozerBeanMapperFactoryBean mapper() throws IOException {
        DozerBeanMapperFactoryBean mapper = new DozerBeanMapperFactoryBean();
        // ResourceLoader is allowed to be null when using the ResourceLoaderUtils.
        ResourcePatternResolver resolver = ResourceLoaderUtils.getResourcePatternResolver(resourceLoader);
        Resource[] mappingFiles = resolver.getResources("classpath*:dozer/**/*.dzr.xml");
        mapper.setMappingFiles(mappingFiles);
        return mapper;
    }
}

最后一种方法的优点是您不依赖于PathMatchingResourcePatternResolver而只是接口。 实用程序类根据注入的ResourceLoader确定它的作用。 人们应该更喜欢这种加载资源的方式。

使用ApplicationContext

@Configuration
public class MyConfiguration {

    @Autowired
    private ApplicationContext context;

    public DozerBeanMapperFactoryBean mapper() throws IOException {
        DozerBeanMapperFactoryBean mapper = new DozerBeanMapperFactoryBean();
        Resource[] mappingFiles = ((ResourcePatternResolver) context).getResources("classpath*:dozer/**/*.dzr.xml");
        mapper.setMappingFiles(mappingFiles);
        return mapper;
    }
}

使用PathMatchingResourcePatternResolver

@Configuration
public class MyConfiguration {

    private PathMatchingPatternResolver resolver = new PathMatchingPatternResolver();

    public DozerBeanMapperFactoryBean mapper() throws IOException {
        DozerBeanMapperFactoryBean mapper = new DozerBeanMapperFactoryBean();
        Resource[] mappingFiles = resolver.getResources("classpath*:dozer/**/*.dzr.xml");
        mapper.setMappingFiles(mappingFiles);
        return mapper;
    }
}

或者，如果您想重用已经存在的ResourceLoader就是稍微不同的版本：

@Configuration
public class MyConfiguration {

    @Autowired
    private ResourceLoader resourceLoader;

    public DozerBeanMapperFactoryBean mapper() throws IOException {
        DozerBeanMapperFactoryBean mapper = new DozerBeanMapperFactoryBean();
        Resource[] mappingFiles = new PathMatchingPatternResolver(resourceLoader).getResources("classpath*:dozer/**/*.dzr.xml");
        mapper.setMappingFiles(mappingFiles);
        return mapper;
    }
}