java Properties獲取本地檔案的變數

package com.demo.utils;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Iterator;
import java.util.Properties;


public class SysConfig {
   private Properties props = null;// config.properties
   private static volatile SysConfig conf;

   private SysConfig() {
      props = new Properties();
      loadConfigProps();
   }

   public static SysConfig getInstance() {
      if (conf == null) {
         synchronized (SysConfig.class) {
            if (conf == null) {
               conf = new SysConfig();
            }
         }
      }
      return conf;
   }

   public void loadConfigProps() {
      InputStream is = null;
      try {
         is = getClass().getResourceAsStream("/xx.properties");
         if (is == null) {
            is = getClass().getResourceAsStream("/config.properties");
         }
         InputStreamReader reader = new InputStreamReader(is, "UTF-8");
         props.load(reader);
         Iterator<String> iter = props.stringPropertyNames().iterator();
         while (iter.hasNext()) {
            String key = iter.next();
            props.setProperty(key, props.getProperty(key));
         }
      } catch (IOException e) {
         e.printStackTrace();
      } finally {
         if (is != null) {
            try {
               is.close();
               is = null;
            } catch (Exception e) {
               e.printStackTrace();
            }
         }
      }
   }

   public String getProperty(String key) {
      String tmp = props.getProperty(key);
      if (!StringUtils.isNullOrEmpty(tmp)) {
         return tmp.trim();
      }
      return tmp;
   }

   public String getProperty(String key, String defaultValue) {
      String tmp = props.getProperty(key, defaultValue);
      if (!StringUtils.isNullOrEmpty(tmp)) {
         return tmp.trim();
      }
      return tmp;
   }

   public int getPropertyInt(String key) {
      String tmp = props.getProperty(key);
      if (!StringUtils.isNullOrEmpty(tmp)) {
         return Integer.parseInt(tmp.trim());
      }
      return 0;

   }

   public int getPropertyInt(String key, int defaultValue) {
      String tmp = props.getProperty(key);
      if (!StringUtils.isNullOrEmpty(tmp)) {
         return Integer.parseInt(tmp.trim());
      }
      return defaultValue;
   }

   public long getPropertyLong(String key, long defaultValue) {
      String tmp = props.getProperty(key);
      if (!StringUtils.isNullOrEmpty(tmp)) {
         return Integer.parseInt(tmp.trim());
      }
      return defaultValue;
   }
}