Question

我有一个包含许多.properties文件的项目，这些属性文件的数量变化很大。我不想用以下内容导入每个单独的属性：

@PropertySource(value = "classpath:some.properties")

所以我尝试使用以下简化的示例代码从目录中加载所有属性：

@Configuration
@Import(SomeClass.class)
public class SimpleConfiguration {

    private static final String TABLE_DIR = "src/main/resources/tables";
    private static final String TABLE_RESOURCE = "/tables/";  

    @Autowired
    public SomeClass someClass; 

    @Bean
    public static PropertySourcesPlaceholderConfigurer properties() {
        PropertySourcesPlaceholderConfigurer properties = new PropertySourcesPlaceholderConfigurer();
        Path dir = Paths.get(TABLE_DIR);
        List<ClassPathResource> allProperties = new ArrayList<>();
        try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir)) {
            for (Path file : stream) {
                allProperties.add(new ClassPathResource(TABLE_RESOURCE + file.getFileName()));
            }
        } catch (IOException | DirectoryIteratorException x) {              
            System.err.println(x);
        }
        ClassPathResource[] props = allProperties.toArray(new ClassPathResource[allProperties.size()]);
        Resource[] resources = props;       
        properties.setLocations(resources);
        properties.setIgnoreUnresolvablePlaceholders(true);
        return properties;
    }       
}

简化示例类

public class SomeClass {

    @Autowired
    private Environment env;

    @PostConstruct
    public void doSomething() {
        String tableName = "person";
        String someValue = env.getProperty(tableName + ".primaryKey");
    }
}

尝试获取值时，env.getProperty会引发Caused by: java.lang.NullPointerException: null，因为Environment对象不包含我预先加载PropertySourcesPlaceholderConfigurer

如何在配置PropertySourcesPlaceholderConfigurer后检索属性，是否仍可以使用自动装配的Environment对象进行检索？

Spring：结合PropertySourcesPlaceholderConfigurer和Environment

0 个答案: