j2me 联网技术分析总结

lukew

基本点:
Generic Connections
In the CLDC Generic Connection framework, all connections are created usingthe open static method from the Connector class. Ifsuccessful, this method returns an object that implements one of the genericconnection interfaces. Figure 1 shows how these interfaces form an is-ahierarchy. The Connection interface is the base interface suchthat StreamConnectionNotifier is a Connection andInputConnection is a Connection too.

Figure 1: Connection interface hierarchy

   

• The Connection interface is the most basic connection type. It    can only be opened and closed.   
  
• The InputConnection interface represents a device from which    data can be    read. Its openInputStream method returns an input stream for the    connection.   
  
• The OuputConnection interface represents a device to which data    can be    written. Its openOutputStream method returns an output stream for    the connection.   
  
• The StreamConnection interface combines the input and output    connections.   
  
• The ContentConnection is a subinterface of    StreamConnection. It    provides access to some of the basic meta data information provided by HTTP    connections.   
  
• The StreamConnectionNotified waits for a connection to be    established.    It returns a StreamConnection on which a communication link has ben    established.   
  
• The DatagramConnection represents a datagram endpoint.
  

The open method of the Connector class has thefollowing syntax, where the String parameter has the format"protocol:address;parameters".
<div style="border: 1px solid #cccccc; padding: 4px 5px 4px 4px; background-color: #eeeeee; font-size: 13px; width: 98%;"><!---->Connector.open(String);