Ip0.0.0.0

A Special IP Address: 0.0.0.0 is equivalent to this in Java and represents the IP address of the current device. In Java programming, we use serversocket for network listening. Generally, we only need the following code: serversocket serversock = new serversocket (8888); serversock. accept (); if my host IP address is 10.10.152.8, you can use the above Code to listen. 127.0.0.1: 8888 or 10.10.152.8: 8888 can be connected, but have you ever thought about it, which IP address is used by this serversocket for listening? If we change the above Code to explicit binding: serversocket Ss = new serversocket (); string IP = "10.10.152.8"; int Port = 8888; inetsocketaddress ADDR = new inetsocketaddress (IP, port); SS. BIND (ADDR); SS. accept (); you will find that 127.0.0.1: 8888 cannot be accessed. If you change the IP address to 127.0.0.1, then 10.152.8: 8888 cannot be accessed. In fact, the secret behind it lies in the IP address 0.0.0.0, which can represent all the IP addresses of the local machine, but this IP address does not actually exist. We cannot ping it. If we change the IP address to 0.0.0.0: serversocket Ss = new serversocket (); string IP = "0.0.0.0"; int Port = 8888; inetsocketaddress ADDR = new inetsocketaddress (IP, Port); SS. BIND (ADDR); SS. accept (); we will find that this is the same as the default behavior, 127.0.0.1: 8888 or 10.10.152.8: 8888 can be connected.