实现功能:(1)客户端开机自动琐定,输入帐号、密码后进行验证登陆并开始计费。或控制端远程解锁上机。 
(2).控制端能够对上网的客户端进行远程控制,比如:远程关机、注销、锁定、远程结帐后又自动锁定计算机等功能。 
(3)能对客户端发送消息。 
(4)客户端在上机过程中能够随时查看消费状态,比如:预缴金额、上机时间、上机金额等。
MySql表结构:
desc user;
+----------+-------------+------+-----+---------+-------+
| Field    | Type        | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| uid      | varchar(30) | NO   | PRI | 0       |       |
| password | varchar(30) | NO   |     | 0       |       |
| balance  | double      | NO   |     | 0       |       |
| isvip    | int(2)      | NO   |     | 0       |       |
+----------+-------------+------+-----+---------+-------+
4 rows in set (0.00 sec)
desc userhistory;
+-----------+-------------+------+-----+-------------------+-------+
| Field     | Type        | Null | Key | Default           | Extra |
+-----------+-------------+------+-----+-------------------+-------+
| cid       | varchar(30) | NO   |     | 0                 |       |
| uid       | varchar(30) | NO   | MUL | 0                 |       |
| isvip     | int(2)      | NO   |     | 0                 |       |
| logintime | timestamp   | NO   |     | CURRENT_TIMESTAMP |       |
| usetime   | varchar(30) | NO   |     | 00:00:00          |       |
| cost      | double      | NO   |     | 0                 |       |
+-----------+-------------+------+-----+-------------------+-------+
6 rows in set (0.00 sec)
涉及知识点:swing,socket和serverSocket,jdbc,多线程,心跳包建立长连接,通信消息封装为xml。。。。
                                    
                                    
                                        
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