Java使用application.property读取文件里面的值

package com.hafiz.www.util;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.*;import java.util.Properties;/** * Desc:properties文件获取工具类 * Created by hafiz.zhang on 2016/9/15. */public class PropertyUtil {  private static final Logger logger = LoggerFactory.getLogger(PropertyUtil.class);  private static Properties props;  static{    loadProps();  }  synchronized static private void loadProps(){    logger.info("开始加载properties文件内容.......");    props = new Properties();    InputStream in = null;    try {　　　　　　　<!--第一种，通过类加载器进行获取properties文件流-->      in = PropertyUtil.class.getClassLoader().getResourceAsStream("jdbc.properties");　　　　　　 <!--第二种，通过类进行获取properties文件流-->      //in = PropertyUtil.class.getResourceAsStream("/jdbc.properties");      props.load(in);    } catch (FileNotFoundException e) {      logger.error("jdbc.properties文件未找到");    } catch (IOException e) {      logger.error("出现IOException");    } finally {      try {        if(null != in) {          in.close();        }      } catch (IOException e) {        logger.error("jdbc.properties文件流关闭出现异常");      }    }    logger.info("加载properties文件内容完成...........");    logger.info("properties文件内容：" + props);  }  public static String getProperty(String key){    if(null == props) {      loadProps();    }    return props.getProperty(key);  }  public static String getProperty(String key, String defaultValue) {    if(null == props) {      loadProps();    }    return props.getProperty(key, defaultValue);  }}