Java在Web项目中读取properties文件

 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.sql.SQLException;
 import java.util.Properties;

 import javax.sql.DataSource;

 import com.alibaba.druid.pool.DruidDataSourceFactory;

 public class JDBCUtils
 {
     protected static DataSource ds;

     static
     {
         try
         {
             Properties properties = loadPropertyFile("druid.properties");
             ds = DruidDataSourceFactory.createDataSource(properties);
         }
         catch (Exception e)
         {
             e.printStackTrace();
         }
     }

     public static Properties loadPropertyFile(String fileName)
     {
         if (null == fileName || fileName.equals(""))
         {
             throw new IllegalArgumentException("Properties file path can not be null: " + fileName);
         }

         InputStream inputStream = null;
         Properties properties = null;
         try
         {
             inputStream = JDBCUtils.class.getClassLoader().getResourceAsStream(fileName);
             properties = new Properties();
             properties.load(inputStream);
         }
         catch (FileNotFoundException e)
         {
             throw new IllegalArgumentException("Properties file not found: " + fileName);
         }
         catch (IOException e)
         {
             throw new IllegalArgumentException("Properties file can not be loading: " + fileName);
         }
         finally
         {
             try
             {
                 if (inputStream != null)
                 {
                     inputStream.close();
                 }
             }
             catch (IOException e)
             {
                 e.printStackTrace();
             }
         }
         return properties;
     }

     /**
      * 获得数据源
      *
      * @return
      */
     public static DataSource getDataSource()
     {
         return ds;
     }

     public static void closeConnection() throws SQLException
     {
         if (ds != null && ds.getConnection() != null && !ds.getConnection().isClosed())
         {
             ds.getConnection().close();
         }
     }
 }