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();
        }
    }
}