Apache commons net 包介绍和简单使用

2015/02/26 37304

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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 <rwinston@apache.org>

 *

 */

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):

代码片段