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t-io is a aio framework for java
There is a newer version: 3.7.3.v202400213-RELEASE
package com.litongjava.tio.utils;

import java.io.FileNotFoundException;
import java.net.URL;

import org.apache.commons.configuration2.PropertiesConfiguration;
import org.apache.commons.configuration2.builder.DefaultReloadingDetectorFactory;
import org.apache.commons.configuration2.builder.FileBasedConfigurationBuilder;
import org.apache.commons.configuration2.builder.fluent.Parameters;
import org.apache.commons.configuration2.builder.fluent.PropertiesBuilderParameters;
import org.apache.commons.configuration2.convert.DefaultListDelimiterHandler;
import org.apache.commons.configuration2.ex.ConfigurationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.litongjava.tio.utils.hutool.StrUtil;

/**
 * 
 * @author tanyaowu 
 * 2016年9月14日 下午5:06:51
 */
public class ConfigUtils {
  private static Logger log = LoggerFactory.getLogger(ConfigUtils.class);

  /**
   * 
   * @param filename
   * @param encoding
   * @param t
   * @return
   * @throws FileNotFoundException
   * @author: tanyaowu
   */
  public static  T initConfig(String filename, String encoding, T t)
      throws FileNotFoundException {
    return initConfig(null, filename, encoding, t);
  }

  /**
   * 
   * @param filename
   * @param encoding
   * @return
   * @throws FileNotFoundException
   * @author: tanyaowu
   */
  public static PropertiesConfiguration initConfig(String filename, String encoding) throws FileNotFoundException {
    return initConfig(null, filename, encoding);
  }

  /**
   * 
   * @param filename1
   * @param filename2
   * @param encoding
   * @return
   * @throws FileNotFoundException
   * @author: tanyaowu
   */
  public static PropertiesConfiguration initConfig(String filename1, String filename2, String encoding)
      throws FileNotFoundException {
    return initConfig(filename1, filename2, encoding, ',');
  }

  /**
   * 
   * @param filename1
   * @param filename2
   * @param encoding
   * @param listDelimiter
   * @return
   * @throws FileNotFoundException
   * @author: tanyaowu
   */
  public static PropertiesConfiguration initConfig(String filename1, String filename2, String encoding,
      char listDelimiter) throws FileNotFoundException {
    Parameters _parameters = new Parameters();
    PropertiesBuilderParameters parameters = _parameters.properties();
    String filename = filename1;
    ClassLoader cl = ConfigUtils.class.getClassLoader();
    URL url = null;
    if (StrUtil.isNotBlank(filename1)) {
      url = (cl != null ? cl.getResource(filename1) : ClassLoader.getSystemResource(filename1));
    }

    if (url == null) {
      url = (cl != null ? cl.getResource(filename2) : ClassLoader.getSystemResource(filename2));
      if (url == null) {
        throw new FileNotFoundException(filename1);
      }
      filename = filename2;
    }

    parameters.setFileName(filename);
    parameters.setThrowExceptionOnMissing(false);
    parameters.setEncoding(encoding);
    parameters.setListDelimiterHandler(new DefaultListDelimiterHandler(listDelimiter));
    parameters.setReloadingDetectorFactory(new DefaultReloadingDetectorFactory());
    parameters.setIncludesAllowed(true);
    FileBasedConfigurationBuilder builder = new FileBasedConfigurationBuilder<>(
        PropertiesConfiguration.class).configure(parameters);

    try {
      PropertiesConfiguration config = builder.getConfiguration();
      return config;
    } catch (ConfigurationException e) {
      log.error(e.toString(), e);
      return null;
    }
  }

  /**
   * 如果finename1存在就加载finename1，否则加载finename2
   * @param filename1
   * @param filename2
   * @param encoding
   * @param t
   * @return
   * @throws FileNotFoundException
   * @author: tanyaowu
   */
  public static  T initConfig(String filename1, String filename2, String encoding,
      T t) throws FileNotFoundException {
    return initConfig(filename1, filename2, encoding, ',', t);
  }

  /**
   * 如果finename1存在就加载finename1，否则加载finename2
   * @param filename1
   * @param filename2
   * @param encoding
   * @param listDelimiter
   * @param t
   * @return
   * @throws FileNotFoundException
   * @author: tanyaowu
   */
  public static  T initConfig(String filename1, String filename2, String encoding,
      char listDelimiter, T t) throws FileNotFoundException {
    PropertiesConfiguration config = initConfig(filename1, filename2, encoding, listDelimiter);
    t.append(config);
    return t;
  }

}