Java Properties 转换为具有层级结构的 Map

PropertiesToNestedMap.java

import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.boot.context.properties.source.ConfigurationPropertySource;
import org.springframework.boot.context.properties.source.ConfigurationPropertySources;
import org.springframework.core.env.PropertiesPropertySource;

import java.util.Map;
import java.util.Properties;

public class PropertiesToNestedMap {

    /**
     * Java Properties 转换为具有层级结构的 Map
     *
     * 例如：
     * java.class.version = 60.0
     * java.home = /usr/lib/jvm/java-16-openjdk
     * java.runtime.name = OpenJDK Runtime Environment
     * java.runtime.version = 16.0.2+7
     *
     * 转成 Map 的结果如下：
     * {
     *     java={
     *         runtime={
     *             version=16.0.2+7,
     *             name=OpenJDK Runtime Environment
     *         },
     *         home=/usr/lib/jvm/java-16-openjdk,
     *         class={
     *             version=60.0
     *         }
     *     }
     * }
     *
     */
    public static Map propertiesToNestedMap(Properties properties) {
        PropertiesPropertySource propertySource = new PropertiesPropertySource("map", properties);
        Iterable<ConfigurationPropertySource> propertySources = ConfigurationPropertySources.from(propertySource);
        Binder binder = new Binder(propertySources);
        Map map = binder.bind("", Map.class).orElse(null);
        return map;
    }
}