文件名称:udp
介绍说明－－下载内容均来自于网络，请自行研究使用
客户端之间发送PING报文，客户端接受其他客户端的PING报文，回复信息。
个人想法：通过UDP连接，客户端与服务器建立连接，登录只要用户名（不能重复），能从服务器查询在线用户。-There are four main components to phase 2:
1) Add functionality to send “ping” messages over UDP and listen for echo
responses, in order to estimate the round trip time to another peer.-- Mandatory
2) Add functionality to respond to ping messages from other peers.-- Mandatory
3) Add functionality to connect to another peer and download a file.--Optional
4) Add functionality to make your peer a file server, so that other peers may
connect and download files from you.
个人想法：通过UDP连接，客户端与服务器建立连接，登录只要用户名（不能重复），能从服务器查询在线用户。-There are four main components to phase 2:
1) Add functionality to send “ping” messages over UDP and listen for echo
responses, in order to estimate the round trip time to another peer.-- Mandatory
2) Add functionality to respond to ping messages from other peers.-- Mandatory
3) Add functionality to connect to another peer and download a file.--Optional
4) Add functionality to make your peer a file server, so that other peers may
connect and download files from you.
(系统自动生成,下载前可以参看下载内容)
下载文件列表
udp
...\client.cpp
...\server.cpp