测试 TCP 端口: telnel IP PORT nc -vz IP PORT 测试 UDP 端口: nc -vuz IP PORT 其中 -u 表示使用 udp 协议来进行测试. -u, --udp Use UDP instead of default TCP 具体选项的功能,可以观察man page 来进行查询. udp 端口示例: [root@docker log]# nc -vuz Ncat: Version 7.70 ( https://nmap.o
原文:http://tutorials.jenkov.com/java-networking/udp-datagram-sockets.html UDP vs. TCP Sending Data via a DatagramSocket Receiving Data via a DatagramSocket DatagramSocket's are Java's mechanism for network communication via UDP instead of TCP. UDP is