Java获取IPv4地址

关于使用提供的代码生成IP地址的链接。

String ip; try { Enumeration interfaces = NetworkInterface.getNetworkInterfaces(); while (interfaces.hasMoreElements()) { NetworkInterface iface = interfaces.nextElement(); // filters out 127.0.0.1 and inactive interfaces if (iface.isLoopback() || !iface.isUp()) continue; Enumeration addresses = iface.getInetAddresses(); while(addresses.hasMoreElements()) { InetAddress addr = addresses.nextElement(); ip = addr.getHostAddress(); System.out.println(iface.getDisplayName() + " " + ip); } } } catch (SocketException e) { throw new RuntimeException(e); } 

我已经实现了确切的代码来获取IP地址，但它提供了IPv4和IPv6地址。 以下是生成的值。

 Qualcomm Atheros AR5BWB222 Wireless Network Adapter 192.168.1.5 Qualcomm Atheros AR5BWB222 Wireless Network Adapter fe80:0:0:0:a874:xxxx:xxxx:9150%wlan0 

（IPv6地址编辑）

有什么方法我只能获得IPv4值，而不是两者兼而有之？

Answer 1

您可以检查addr对象的类型，以查看它是Inet4Address还是Inet6Address实例。

例如：

 String ip; try { Enumeration interfaces = NetworkInterface.getNetworkInterfaces(); while (interfaces.hasMoreElements()) { NetworkInterface iface = interfaces.nextElement(); // filters out 127.0.0.1 and inactive interfaces if (iface.isLoopback() || !iface.isUp()) continue; Enumeration addresses = iface.getInetAddresses(); while(addresses.hasMoreElements()) { InetAddress addr = addresses.nextElement(); // *EDIT* if (addr instanceof Inet6Address) continue; ip = addr.getHostAddress(); System.out.println(iface.getDisplayName() + " " + ip); } } } catch (SocketException e) { throw new RuntimeException(e); }