Apache commons net 项目中封装了各种网络协议的客户端,支持的协议包括:
· FTP
· NNTP
· SMTP
· POP3
· Telnet
· TFTP
· Finger
· Whois
· rexec/rcmd/rlogin
· Time (rdate) andDaytime
· Echo
· Discard
· NTP/SNTP
目前最新的版本为3.3.
和httpclient相比,net包更加侧重各种网络协议的使用,很多是专业网络方面的知识,对不了解的这些网络特性的情况,很难理解这些包的具体含义。
总而言之,这是一个强大的类,这是一个富有生命力,有专业精神的类。 :)
- import java.util.Arrays;
- import java.util.Scanner;
- import org.apache.commons.net.util.SubnetUtils;
- import org.apache.commons.net.util.SubnetUtils.SubnetInfo;
- /**
- * Example class that shows how to use the {@link SubnetUtils} class.
- * @author Rory Winston <[email protected]>
- *
- */
- public classSubnetUtilsExample {
- public static void main(String[] args) {
- String subnet = "192.168.38.1/31";
- SubnetUtils utils = new SubnetUtils(subnet);
- SubnetInfo info = utils.getInfo();
- System.out.printf("Subnet Information for %s:\n",subnet);
- System.out.println("--------------------------------------");
- System.out.printf("IP Address:\t\t\t%s\t[%s]\n",info.getAddress(),
- Integer.toBinaryString(info.asInteger(info.getAddress())));
- System.out.printf("Netmask:\t\t\t%s\t[%s]\n",info.getNetmask(),
- Integer.toBinaryString(info.asInteger(info.getNetmask())));
- System.out.printf("CIDR Representation:\t\t%s\n\n",info.getCidrSignature());
- System.out.printf("Supplied IP Address:\t\t%s\n\n",info.getAddress());
- System.out.printf("Network Address:\t\t%s\t[%s]\n",info.getNetworkAddress(),
- Integer.toBinaryString(info.asInteger(info.getNetworkAddress())));
- System.out.printf("Broadcast Address:\t\t%s\t[%s]\n",info.getBroadcastAddress(),
- Integer.toBinaryString(info.asInteger(info.getBroadcastAddress())));
- System.out.printf("Low Address:\t\t\t%s\t[%s]\n",info.getLowAddress(),
- Integer.toBinaryString(info.asInteger(info.getLowAddress())));
- System.out.printf("High Address:\t\t\t%s\t[%s]\n",info.getHighAddress(),
- Integer.toBinaryString(info.asInteger(info.getHighAddress())));
- System.out.printf("Total usable addresses: \t%d\n",Integer.valueOf(info.getAddressCount()));
- System.out.printf("Address List: %s\n\n", Arrays.toString(info.getAllAddresses()));
- System.out.println("全部地址:" + Arrays.toString(info.getAllAddresses()));
- final String prompt ="Enter an IP address (e.g. 192.168.0.10):";
- System.out.println(prompt);
- Scanner scanner = new Scanner(System.in);
- while (scanner.hasNextLine()) {
- String address =scanner.nextLine();
- System.out.println("The IP address [" + address + "] is "
- + (info.isInRange(address)? "": "not ")
- + "within the subnet [" + subnet + "]");
- System.out.println(prompt);
- }
- }
- }
运行结果如下:
Subnet Information for 192.168.38.1/31:
--------------------------------------
IP Address: 192.168.38.1 [11000000101010000010011000000001]
Netmask: 255.255.255.254 [11111111111111111111111111111110]
CIDR Representation: 192.168.38.1/31
Supplied IP Address: 192.168.38.1
Network Address: 192.168.38.0 [11000000101010000010011000000000]
Broadcast Address: 192.168.38.1 [11000000101010000010011000000001]
Low Address: 0.0.0.0 [0]
High Address: 0.0.0.0 [0]
Total usable addresses: 0
Address List: []
全部地址:[]
Enter an IP address (e.g.192.168.0.10):
来源: http://www.phpxs.com/code/1002491/