configfileparser.java

一个应用timer的小程序

package net.sujee.util;

import java.io.IOException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Properties;

public class ConfigFileParser
{
   File mConfigFile;
   Properties prop;

   public ConfigFileParser (String fileName) throws IOException
   {
      prop = new Properties ();

      mConfigFile = new File (getFileLocation(fileName));
      if (  mConfigFile.exists() && mConfigFile.isFile() &&
            mConfigFile.canRead() )
       {
          parseFile ();
          return;
       }




       // last thing throw exeception
      throw new IOException ("ConfigFileParser : file '" + fileName +
            "' doesn't exist");


   }


   public String getFileLocation (String name)
   {
      // try something plain
      File file = new File (name);
      if (  file.exists() && file.isFile() &&
            file.canRead() )
          return file.getAbsolutePath();

      // now search current dir.
      String pwd = (String) System.getProperty("user.dir");
      String slash = (String) System.getProperty("file.separator");
      file = new File (pwd + slash + name);
      if (  file.exists() && file.isFile() &&
            file.canRead() )
          return file.getAbsolutePath();

      // now search home dir.
      String homeDir = (String) System.getProperty("user.home");
      file = new File (homeDir + slash + name);
      if (  file.exists() && file.isFile() &&
            file.canRead() )
          return file.getAbsolutePath();

          // if not return NULL
      return null;
   }




   public String getConfigProperty (String name, boolean trim)
   {
      String s = (String) prop.get(name);
      if ( (trim) && s != null)
         return s.trim();
      else
          return s;
   }

   public int readIntProperty (String propName, int defaultValue)
   {
      try
      {
         int i = Integer.parseInt(getConfigProperty(propName, true));
         return i;
      }
      catch (Exception e)
      {
         return defaultValue;
      }
   }

   public void savePropertiesToFile ()
   {
      try
      {
         FileOutputStream fout = new FileOutputStream (mConfigFile);
         prop.store( fout,"Config file for project timer" );
         fout.close();
      }
      catch (IOException e)
      {
         e.printStackTrace();
      }
   }

   public void setProperty (Object key, Object value)
   {
      prop.put  (key, value);
   }

   private void parseFile () throws IOException
   {
      prop.load(new FileInputStream (mConfigFile));
   }
}