在spring配置文件中设置资源

Question

我正在尝试配置spring配置中的推土机。当使用xml配置时，它会像

<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()，但我无法访问配置类中的ApplicationContext。

我尝试了ContextRefreshedEvent并从那里添加资源，但仍然没有运气。 （afterPropertiesSet方法已经被调用，添加映射不会工作）

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(); 
    } 
} 
} 

还试图用使用ClassPathResource但找不到正确的方法

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

如何添加使用ClassPathResource作为映射位置？

---答案---

@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来classpath*:dozer/**/*.dzr.xml转化为Resource[]。有两个主要选项可以使用。

1. 注入ApplicationContext到您的配置类，它转换为ResourcePatternResolver，并使用getResources方法。 Al Spring默认的应用程序上下文实现实现了接口ResourcePatternResolver。
2. 创建一个PathMatchingResourcePatternResolver有或没​​有前面提到的上下文。
3. 使用ResourcePatternUtils并注入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; 
    } 
} 

最后这个方法的优点是，你不依赖于PathMatchingResourcePatternResolver只是接口。公用事业类根据注入的ResourceLoader确定它的功能。人们应该更喜欢这种加载资源的方式。

使用的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，如果你想重用已有的ResourceLoader略为不同的版本：

@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; 
    } 
}