Java request host IP address and its corresponding subnet mask

Not much to say, directly on the code.

Package Com.ckw.test;import Java.io.BufferedReader; Import java.io.IOException; Import Java.io.inputstreamreader;import Java.util.*;import Java.util.map.entry;public class TestOfSubNetMask {Map <string, string> map = new hashmap<string, string> (); String ipAddress; String SubnetMask; Boolean flag = false; Used to mark a pair of IP addresses with a subnet mask (a pair that is adjacent to the location)//Get the subnet mask for the corresponding IP address public void Getipaddressandmask () {String OS = system.getproperty ("OS.N   Ame ");  if (OS! = null && os.startswith ("Windows")) {try {String command = "cmd.exe/c Ipconfig/all";    Process p = runtime.getruntime (). exec (command);    BufferedReader br = new BufferedReader (New InputStreamReader (P.getinputstream (), "gb2312"));      String Line; System.out.println ("---------------------------------------------------------------");            while (line = Br.readline ())! = null) {System.out.println (line); This sentence can be omitted, mainly in order to print out all the information convenient comparison/* * To obtain the machine IP address * In the line beginning with "IPV4" to obtain an IP address, the English version is "IP Address" beginning * Format: * IPV4 Address ............:10.10.116.132(preferred) <span style= "White-space:pre" ></span>//see the command output under Doc */if ( Line.indexof ("IPV4 address") > 0 | |   Line.indexof ("IP Address") > 0) {int index = Line.indexof (":");     Index + = 2;    ipAddress = line.substring (index); Remove Chinese Characters "10.10.116.132 (preferred)" <span style= "white-space:pre" ></span> int i; char [] array = Ipaddress.tochararray (); for (i=0; i<array.length; i++) {if (array[i]!= '. ' && (array[i]< ' 0 ' | | Array[i]> ' 9 ')) break;  } ipAddress = ipaddress.substring (0, I);  Flag = true; There is an IP address, there must be its corresponding subnet mask}//* Get the machine subnet mask * In the line beginning with "subnet mask" to get the subnet mask, the English version is "Subnet mask" beginning * format: * Subnet mask ... ...: 255.255.255.192 */if (flag==true && (Line.indexof ("Subnet mask") > 0 | |       Line.indexof ("Subnet Mask") > 0) {int index = Line.indexof (":");       Index + = 2;      SubnetMask = line.substring (index);  Flag = false; Consumes Map.put (ipAddress, SubnetMask); }} br.close (); System.out.println ("---------------------------------------------------------------");  } catch (IOException e) {e.printstacktrace (); }}}//main function test public static void main (String args[]) {testofsubnetmask test = new Testofsubnetmask (); test.ge  Tipaddressandmask (); map<string, string> map = Test.map; iterator<entry<string, string>> i = Map.entryset (). Iterator (); while (I.hasnext ()) {entry<string, string> e = I.next (); String ipAddress = E.getkey (); String SubnetMask = E.getvalue (); System.out.println ("IP Address:" + ipAddress); SYSTEM.OUT.PRINTLN ("Subnet mask:" + SubnetMask);        } } }

The result is:

---------------------------------------------------------------Windows IP Configuration host name ............. : DADI primary DNS suffix ........... : node type ............: hybrid IP routing enabled ..........: no WINS agent enabled ... . : No Wireless LAN Adapter wireless network connection 29: Connection specific DNS suffix ...: description ............... : Microsoft Virtual WiFi Miniport Adapter #26 Physical address ............. : 22-16-d8-c9-a3-b2 DHCP is enabled ........... : No automatic configuration Enabled ..........: is a local link IPv6 address ..... : fe80::89eb:f7f1:e6b7:6133%74 (preferred) <span style= "color: #ff0000;" > IPV4 Address ............:172.17.31.1(preferred) </span> <span style= "color: #ff0000;" > Subnet Mask ............:255.255.0.0</span> default gateway ............. : DHCPv6 IAID ...........  : 1512183512 DHCPv6 Client DUID ...: 00-01-00-01-19-03-ef-d5-08-60-6e-dc-a7-b7 DNS server ...........            : fec0:0:0:ffff::1%1                           fec0:0:0:ffff::2%1 fec0:0:0:ffff::3%1 TCPIP on the NetBIOS ...: Wireless LAN adapter wireless network connection enabled: Media status ............: media disconnected specific DNS suffix .....: Description ...... . . . . . . . . . . . : Qualcomm Atheros AR9485 Wireless Network Adapter Physical Address ............. : 20-16-d8-c9-a3-b2 DHCP is enabled ........... : Is automatic configuration enabled ..........: is an Ethernet adapter Local Area Connection: Connection specific DNS suffix ...: description ............... : Realtek PCIe GBE Family Controller Physical Address ............. : 08-60-6e-dc-a7-b7 DHCP is enabled ........... : Is automatic configuration enabled ..........: is a local link IPv6 address ..... : fe80::c0c9:c8b6:4003:7976%12 (preferred) <span style= "color: #ff0000;"   >ipv4 Address ............:10.10.116.132(preferred) Subnet mask ............:255.255.255.192</span> Time to get a lease ... . : July 18, 2015 23:01:04 time the lease expires ..... . : July 25, 2015 23:01:02 defaultGateway............. : 10.10.116.129 DHCP Server ........... : 222.200.98.70 DHCPv6 IAID ...........  : 252207214 DHCPv6 Client DUID ...: 00-01-00-01-19-03-ef-d5-08-60-6e-dc-a7-b7 DNS server ........... : 202.96.128.86 202.116.128.1 TCPIP on NetBIOS ...: Tunnel adapter Local connection is enabled * 37 : Connect a specific DNS suffix ...: description ............... : Teredo Tunneling Pseudo-Interface Physical Address ............. : 00-00-00-00-00-00-00-e0 DHCP is enabled ........... : No automatic configuration enabled ..........: is IPV6 address ............:2001:0:9d38:6ab8:aa:e4df:48c0:88c7(preferred) Local link IP V6 Address ... : fe80::aa:e4df:48c0:88c7%66 (preferred) Default gateway ............. ::: TCPIP on NetBIOS ...: Tunnel adapter 6to4 Adapter: Media status ............: Media has been disconnected from a specific DNS suffix. . . . . . . : Description ............... : Microsoft 6to4 Adapter Physical Address ............ . : 00-00-00-00-00-00-00-e0 DHCP is enabled ...........  : No automatic configuration enabled ..........: is a tunnel adapter reusable Microsoft 6to4 Adapter: Media status ............: media disconnected-specific DNS suffix ...: description ............... : Microsoft 6to4 Adapter #2 Physical Address ............. : 00-00-00-00-00-00-00-e0 DHCP is enabled ...........     : No automatic configuration enabled ..........: is tunnel adapter Local Area Connection * 17: Media status ............: media disconnected specific DNS suffix ....: Describe............... : Microsoft 6to4 Adapter #3 Physical Address ............. : 00-00-00-00-00-00-00-e0 DHCP is enabled ........... : No automatic configuration enabled ..........: Yes//part omitted ... ---------------------------------------------------------------

This is the main output <span style= "color: #000099;" >IP site  : 10.10.116.132 Subnet Mask: 255.255.255.192IP  address: 172.17.31.1 Subnet mask:255.255.0.0</span>

Analysis: Red for the IP address to be crawled with the subnet mask, Blue is the result of the last crawl. A comparison of Ipconfig results under Doc is attached below

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Java request host IP address and its corresponding subnet mask