JDBC分层开发

package db;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;

public class DBHelper {
    private static Properties p=new Properties();
    static{
        try {
            p.load(new FileReader("jdbc.properties"));
            Class.forName(p.getProperty("driver"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
    public static Connection getConnection() {
        Connection conn=null;
        try {
            conn=DriverManager.getConnection(p.getProperty("url"), p.getProperty("name"), p.getProperty("pass"));
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }
    public static void closeConnection(Connection conn) {
        try {
            if(!conn.isClosed()||conn!=null)
                conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}