content: /**
   * Copyright (c) 2005-2011 springside.org.cn
   * <p>
   * $Id: PropertiesLoader.java 1690 2012-02-22 13:42:00Z calvinxiu $
   */
  package com.jeespring.common.utils;
  
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.NoSuchElementException;
  import java.util.Properties;
  
  import org.apache.commons.io.IOUtils;
  import org.springframework.core.io.DefaultResourceLoader;
  import org.springframework.core.io.Resource;
  import org.springframework.core.io.ResourceLoader;
  import org.yaml.snakeyaml.Yaml;
  
  /**
   * Properties文件载入工具类. 可载入多个properties文件, 相同的属性在最后载入的文件中的值将会覆盖之前的值，但以System的Property优先.
   *
   * @author calvin
   * @version 2013-05-15
   */
  @SuppressWarnings("rawtypes")
  public class PropertiesLoader {
  
      private static ResourceLoader resourceLoader = new DefaultResourceLoader();
  
      private final Properties properties;
  
      public PropertiesLoader(String... resourcesPaths) {
          properties = loadProperties(resourcesPaths);
      }
  
      public Properties getProperties() {
          return properties;
      }
  
      /**
       * 取出Property，但以System的Property优先,取不到返回空字符串.
       */
      private String getValue(String key) {
          String systemProperty = System.getProperty(key);
          if (systemProperty != null) {
              return systemProperty;
          }
          if (properties.containsKey(key)) {
              return properties.getProperty(key);
          }
          return "";
      }
  
      /**
       * 取出String类型的Property，但以System的Property优先,如果都为Null则抛出异常.
       */
      public String getProperty(String key) {
          String value = getValue(key);
          if (value == null) {
              throw new NoSuchElementException();
          }
          return value;
      }
  
      /**
       * 取出String类型的Property，但以System的Property优先.如果都为Null则返回Default值.
       */
      public String getProperty(String key, String defaultValue) {
          String value = getValue(key);
          return value != null ? value : defaultValue;
      }
  
      /**
       * 取出Integer类型的Property，但以System的Property优先.如果都为Null或内容错误则抛出异常.
       */
      public Integer getInteger(String key) {
          String value = getValue(key);
          if (value == null) {
              throw new NoSuchElementException();
          }
          return Integer.valueOf(value);
      }
  
      /**
       * 取出Integer类型的Property，但以System的Property优先.如果都为Null则返回Default值，如果内容错误则抛出异常
       */
      public Integer getInteger(String key, Integer defaultValue) {
          String value = getValue(key);
          return value != null ? Integer.valueOf(value) : defaultValue;
      }
  
      /**
       * 取出Double类型的Property，但以System的Property优先.如果都为Null或内容错误则抛出异常.
       */
      public Double getDouble(String key) {
          String value = getValue(key);
          if (value == null) {
              throw new NoSuchElementException();
          }
          return Double.valueOf(value);
      }
  
      /**
       * 取出Double类型的Property，但以System的Property优先.如果都为Null则返回Default值，如果内容错误则抛出异常
       */
      public Double getDouble(String key, Integer defaultValue) {
          String value = getValue(key);
          return value != null ? Double.valueOf(value) : defaultValue;
      }
  
      /**
       * 取出Boolean类型的Property，但以System的Property优先.如果都为Null抛出异常,如果内容不是true/false则返回false.
       */
      public Boolean getBoolean(String key) {
          String value = getValue(key);
          if (value == null) {
              throw new NoSuchElementException();
          }
          return Boolean.valueOf(value);
      }
  
      /**
       * 取出Boolean类型的Property，但以System的Property优先.如果都为Null则返回Default值,如果内容不为true/false则返回false.
       */
      public Boolean getBoolean(String key, boolean defaultValue) {
          String value = getValue(key);
          return value != null ? Boolean.valueOf(value) : defaultValue;
      }
  
      /**
       * 载入多个文件, 文件路径使用Spring Resource格式.
       */
      private Properties loadProperties(String... resourcesPaths) {
          Properties props = new Properties();
  
          for (String location : resourcesPaths) {
              if (location.endsWith(".properties")) {
                  InputStreamReader reader = null;
                  try {
                      Resource resource = resourceLoader.getResource(location);
                      reader = new InputStreamReader(resource.getInputStream(), "utf-8");
                      props.load(reader);
                  } catch (IOException ex) {
                      ex.printStackTrace(System.out);
                  } finally {
                      IOUtils.closeQuietly(reader);
                  }
              } else if (location.endsWith(".yml")) {
                  try {
                      Resource resource = resourceLoader.getResource(location);
                      Yaml yaml = new Yaml();
                      Map map = yaml.loadAs(resource.getInputStream(), Map.class);
                      map = resolv(map);
                      for (Object key : map.keySet()) {
                          props.put(key, map.get(key));
                      }
                  } catch (Exception e) {
                      //e.printStackTrace(System.out);
                  }
              }
          }
          return props;
      }
  
      /**
       * 递归解析map
       *
       * @param map yml初次解析的map
       * @return 解析后的map
       */
      private static Map<String, String> resolv(Map map) {
          Map<String, String> values = new HashMap<>();
          for (Object obj : map.keySet()) {
              String currentkey = obj.toString();
              Object currentObj = map.get(obj);
              if (currentObj instanceof Map) {
  				Map currentMap = resolv((Map) currentObj);
                  for (Object key : currentMap.keySet()) {
                      String mapKey = currentkey + "." + key.toString();
                      values.put(mapKey, currentMap.get(key).toString());
                  }
              } else
                  values.put(currentkey, String.valueOf(currentObj));
          }
          return values;
      }
  }
  