JDBCRDS

    java jdbc 连接不上 RDS ,运行5分钟没反应，然后报错。。。。。。。。。。。。
    这是为什么啊~~~~~~~~~~~~~~~~~~~~~为什么为什么为什么为什么为什么

// 连接数据库
                Connection conn = null;
                try
                {
                        String url = "jdbc:mysql://wwdkfiring.mysql.rds.aliyuncs.com/taobao?autoReconnect=true";
                        String user = "adsp520";
                        String pwd = "aidejshini";
                        
                        Class.forName("com.mysql.jdbc.Driver");
                        conn = DriverManager.getConnection(url, user, pwd);
                        Statement stmt = conn.createStatement();
                        ResultSet rs = stmt.executeQuery("select m_word from keyword_product_number");
                        // 处理结果集
                        while (rs.next())
                        {
                                String name = rs.getString("m_word");
                                System.out.println(name);
                        }
                        rs.close();// 关闭数据库
                        conn.close();
                } catch (Exception ex)
                {
                        System.out.println("Error : " + ex.getMessage());
                }finally{
                          if(conn!=null) conn.close();
                 }