在Spring Boot中将application.properties文件加载到java.util.properties

Question

但是，我希望有一个通用的PropertyHelper类，它可以用于使用application.properties中的属性构建java.util.properties。这能做到吗？

我们目前正在通过以下方式手动实现此目标：

public class PropertyHelper {

    private static Properties loadProperties() {
        try {

             String propsName = "application.properties";
             InputStream propsStream = PropertyHelper.class
                    .getClassLoader().getResourceAsStream(propsName);
            if (propsStream == null) {
                throw new IOException("Could not read config properties");
            }

            Properties props = new Properties();
            props.load(propsStream);

Answer 1

您可以在环境周围创建一个包装器，它将返回一个现成的PropertySource:

您可以这样使用它：

@PropertySource(name="myName", value="classpath:/myName.properties")
public class YourService {

    @Autowired
    private CustomMapProperties customMapProperties;
    ...
    MapPropertySource mapPropertySource = customMapProperties.getMapProperties("myName");
    for(String key: mapPropertySource.getSource().keySet()){
        System.out.println(mapPropertySource.getProperty(key));
    }

CustomMapProperties插入Environment并根据其名称返回请求加载的属性文件：

@Component
public class CustomMapProperties {

    @Autowired
    private Environment env;

    public MapPropertySource getMapProperties(String name) {
        for (Iterator<?> it = ((AbstractEnvironment) env).getPropertySources().iterator(); it.hasNext();) {
            Object propertySource = it.next();
            if (propertySource instanceof MapPropertySource
                    && ((MapPropertySource) propertySource).getName().equals(name)) {
                return (MapPropertySource) propertySource;
            }
        }
        return null;
    }
}