Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;

	try{
		DriverManager.registerDriver(new com.mysql.jdbc.Driver());
		conn = DriverManager.getConnection("jdbc:mysql://localhost/DB명", "ID", "PWD");
		pstmt = conn.prepareStatement("SQL");
		rs = pstmt.executeQuery();
		while(rs.next()){
			writer.println(rs.getInt("col1") + ", " + rs.getString("col2") + "<br>");
		}
	}catch(Exception e){
		e.printStackTrace();
	}finally{
		try{ if(rs != null){ rs.close();} }catch(Exception e){}
		try{ if(pstmt != null){ pstmt.close();} }catch(Exception e){}
		try{ if(conn != null){ conn.close();} }catch(Exception e){}
	}