获取eth0的ip： getIpAddrForInterfaces("eth0")
private String getIpAddrForInterfaces(String interfaceName){
try {
Enumeration<NetworkInterface> enNetworkInterface = NetworkInterface.getNetworkInterfaces(); //获取本机所有的网络接口
while (enNetworkInterface.hasMoreElements()) { //判断 Enumeration 对象中是否还有数据
NetworkInterface networkInterface = enNetworkInterface.nextElement(); //获取 Enumeration 对象中的下一个数据
if (!networkInterface.isUp()) { // 判断网口是否在使用
continue;
}
if (!interfaceName.equals(networkInterface.getDisplayName())) { // 网口名称是否和需要的相同
continue;
}
Enumeration<InetAddress> enInetAddress = networkInterface.getInetAddresses(); //getInetAddresses 方法返回绑定到该网卡的所有的 IP 地址。
while (enInetAddress.hasMoreElements()) {
InetAddress inetAddress = enInetAddress.nextElement();
if (inetAddress instanceof Inet4Address) { //判断是否未ipv4
return inetAddress.getHostAddress();
}
// 判断未lo时
// if (inetAddress instanceof Inet4Address && !inetAddress.isLoopbackAddress()) {
// return inetAddress.getHostAddress();
// }
}
}
} catch (Exception e) {
e.printStackTrace();
}
return "error";
}
获取eth0的子网掩码：getIpAddrMaskForInterfaces("eth0")
private String getIpAddrMaskForInterfaces(String interfaceName) {
try {
Enumeration<NetworkInterface> networkInterfaceEnumeration = NetworkInterface.getNetworkInterfaces(); //获取本机所有的网络接口
while (networkInterfaceEnumeration.hasMoreElements()) { //判断 Enumeration 对象中是否还有数据
NetworkInterface networkInterface = networkInterfaceEnumeration.nextElement(); //获取 Enumeration 对象中的下一个数据
if (!networkInterface.isUp() && !interfaceName.equals(networkInterface.getDisplayName())) { //判断网口是否在使用，判断是否时我们获取的网口
continue;
}
for (InterfaceAddress interfaceAddress : networkInterface.getInterfaceAddresses()) { //
if (interfaceAddress.getAddress() instanceof Inet4Address) { //仅仅处理ipv4
return calcMaskByPrefixLength(interfaceAddress.getNetworkPrefixLength()); //获取掩码位数，通过 calcMaskByPrefixLength 转换为字符串
}
}
}
} catch (SocketException e) {
e.printStackTrace();
}
return "error";
}
//通过子网掩码的位数计算子网掩码
public static String calcMaskByPrefixLength(int length) {
int mask = 0xffffffff << (32 - length);
int partsNum = 4;
int bitsOfPart = 8;
int maskParts[] = new int[partsNum];
int selector = 0x000000ff;
for (int i = 0; i < maskParts.length; i++) {
int pos = maskParts.length - 1 - i;
maskParts[pos] = (mask >> (i * bitsOfPart)) & selector;
}
String result = "";
result = result + maskParts[0];
for (int i = 1; i < maskParts.length; i++) {
result = result + "." + maskParts[i];
}
return result;
}
获取默认网关：getGateWay()
private String getGateWay() {
String [] arr;
try {
Process process = Runtime.getRuntime().exec("ip route list table 0");
String data = null;
BufferedReader ie = new BufferedReader(new InputStreamReader(process.getErrorStream()));
BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
String string = in.readLine();
arr = string.split("\\s+");
return arr[2];
} catch (IOException e) {
e.printStackTrace();
}
return "error";
}