java Properties获取本地文件的变量

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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;   }}
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