java读取配置文件

 public  String getSqlInfo(String key){  String fileName="/systemSetting.properties";  String sql="";  Properties p = new Properties();          try {              InputStream in = this.getClass().getResourceAsStream(fileName);            p.load(in);            in.close();              if(p.containsKey(key)){                  sql = p.getProperty(key);              }          } catch (IOException ex) {           ex.printStackTrace();        }    return sql; }

其中闯入的key值为 systemSetting.properties 对应的key值,方法返回对应的值