java讀取配置文件

 

//這裏的a.ini必須是key=value 模式

public static String CONFIG_FILE_PATH = "C:\\a.ini";

 

//負責讀取

public static void readFileForDayend() throws Exception {
   File file = new File(CONFIG_FILE_PATH);
   Properties properties = new Properties();

   try {
    FileInputStream fi = new FileInputStream(CONFIG_FILE_PATH);
    properties.load(fi);
    Enumeration emu = properties.keys();
    while (emu.hasMoreElements()) {
     String theKey = (String) emu.nextElement();
     String theValue = properties.getProperty(theKey);
     System.setProperty(theKey, theValue);
    }
    try {
     fi.close();
     fi = null;
    } catch (Exception E) {
    }
   } catch (FileNotFoundException e) {
    throw new Exception(" file not found. "
      + file.getAbsolutePath());
   }

  }
  

//傳入key,返回value
 public static String getConfig(String parameterName) throws Exception
  {
   String propValue = System.getProperty(parameterName);
  
   File file = new File(CONFIG_FILE_PATH);
   if (!file.isFile())
   {
    throw new Exception(" file not found." + file.getAbsolutePath());
   }
  
   if (propValue == null)
   {
    readFileForDayend();
    propValue = System.getProperty(parameterName);
   }
   if (propValue == null)
   {
    throw new Exception("Parameter '" + parameterName + "' not found");
   }else{
    return propValue;
   }
  }