用Java进行网速测试
命令格式：
ping ip地址 -l 字节数
注：上面的命令中 l 是字母l,不是数字1
网速等于≈(发送的字节数/返回的时间[毫秒])K字节
以上计算的结果速为字节(byte)，不是我们通常说的位(bps)
如：
C:\Documents and Settings\Administrator>ping 202.101.224.68 -l 1000
Pinging 202.101.224.68 with 1000 bytes of data:
Reply from 202.101.224.68: bytes=1000 time=38ms TTL=251
Reply from 202.101.224.68: bytes=1000 time=38ms TTL=251
Reply from 202.101.224.68: bytes=1000 time=38ms TTL=251
Reply from 202.101.224.68: bytes=1000 time=38ms TTL=251
Ping statistics for 202.101.224.68:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 38ms, Maximum = 38ms, Average = 38ms
根据上述发送及返回的信息可以简单得出到地址202.101.224.68的网速为：
网速等于≈(发送的字节数/返回的时间[毫秒])K字节
≈1000/38K字节
≈26.32K字节
附：ping命令帮助说明
-l size Send buffer size
-w timeout Timeout in milliseconds to wait for each reply.
-n count Number of echo requests to send.
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