A、<p><span style="font-size:13px;font-family: 宋体">SocketException</span></p>
B、<p><span style="font-size:13px;font-family: 宋体">IOException</span></p>
C、<p><span style="font-size:13px;font-family: 宋体">UnknownHostException</span></p>
D、<p><span style="font-size:13px;font-family: 宋体">MalformedURLExceptin</span></p>