public class PropertyConfig {
	private static AbstractBeanFactory beanFactory = null;
	private static final Map<String,String> cache = new oncurrentHashMap<>();
	@Inject  
	  public PropertyConfig(AbstractBeanFactory beanFactory) {
		this.beanFactory = beanFactory;
	}
	/**   
   * 根據(jù)key獲取配置文件的Value  
   * @param key   * @return   
   */
	public static String getProperty(String key) {
		String propValue = "";
		if(cache.containsKey(key)){
			propValue = cache.get(key);
		} else {
			try {
				propValue = beanFactory.resolveEmbeddedValue("${" + key.trim() + "}");
				cache.put(key,propValue);
			}
			catch (IllegalArgumentException ex) {
				ex.printStackTrace();
			}
		}
		return propValue;
	}
}

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/>
  <property name="ignoreResourceNotFound" value="true"/>
  <property name="locations">
    <list>
      <value>classpath:props/${property-path}.properties</value>
      <value>classpath:important.properties</value>
    </list>
  </property>
</bean>

String maxTimeInSecondsProp = PropertyConfig.getProperty("maxTimeInSeconds");

import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import org.springframework.core.io.FileSystemResource;
 
public class Test {
  /**
   * @param args
   */
  public static void main( String[] args ) {
    String configFile = "D:/test/application.properties";
    //如果配置文件在classpath目錄下可以使用ClassPathResource對象
    //Resource resource = new ClassPathResource("/application.properties");
    Resource resource = new FileSystemResource( configFile );
    try {
      Properties property = PropertiesLoaderUtils.loadProperties(resource);
      String driver = property.getProperty("jdbc.driver");
      String url = property.getProperty("jdbc.url");
      String userName = property.getProperty("jdbc.username");
      String password = property.getProperty("jdbc.password");
    }
    catch (IOException e1) {
      //log.error("read config file failed", e1);
    }
  }
}

Resource resource = new ClassPathResource("/application.properties");