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【多选题】
关于 UDP协议通信的特点,下列说法正确的是:( )。A.
UDP是一种无连接的传输层协议，提供面向事务的简单不可靠信息传送服务。
B.
它在通信两端各建立一个socket，在单方面向对方发送数据，不检查发送结果，类似于日常生活中的收发信件。
C.
基于UDP协议的通信使用DatagramSocket类的receive和send方法即可
D.
发送和接收的消息需要均通过一个类DatagramPacket封装数据。
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