JDBC-规范化代码

@Test
	public void query() {
		Connection con = null;
		Statement stmt = null;
		ResultSet rs = null;
		try {
			con = getConnection();
			stmt = con.createStatement();
			String sql = "select * from user";
			rs = stmt.executeQuery(sql);
			while(rs.next()) {
				String username = rs.getString(1);
				String password = rs.getString(2);
				System.out.println(username + ", " + password);
			}
		} catch(Exception e) {
			throw new RuntimeException(e);
		} finally {
			try {
				if(rs != null) rs.close();
				if(stmt != null) stmt.close();
				if(con != null) con.close();
			} catch(SQLException e) {}
		}
}