服务器与客户间通过套接口Socket(TCP)连接。在java中使用套接口相当简单，Java API为处理套接口的通信提供了一个类java.net.Socket.,使得编写网络应用程序相对容易．服务器采用多线程以满足多用户的请求，通过JDBC与后台数据库连接，并通过创建一个ServerSocket对象来监听来自客户的连接请求，默认端口为8080，然后无限循环调用accept()方法接受客户程序的连接-Between server and client through the socket Socket (TCP) connection. In java using a very simple set of interfaces, Java API for dealing with socket communications category provides a java.net.Socket., Making the preparation of web applications is relatively easy. Server used to meet the needs of multi-threaded multi-user request, and the background through the JDBC database connection, and by creating a ServerSocket object to listen for connection requests from clients, the default port is 8080, and then infinite loop calling accept () method to accept client connection