java apache commons net_Apache commons net 包介绍和简单使用

矫情吗；* 2022-11-10 01:17 13阅读 0赞

\[附件介绍Commons常用包介绍，还有包含案例代码，源代码缺少包请到http://commons.apache.org/下载，包括Commons Lang、Commons BeanUtils、Commons IO、Commons Collectio

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。 ：)

package test.ffm83.commons.net.cidr;

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

\*/

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());\[谢谢文章的作者。    Apache Commons包含了很多开源的工具，用于解决平时编程经常会遇到的问题，减少重复劳动。下面是我这几年做开发过程中自己用过的工具类做简单介绍。

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):\[DbUtils 和 DBCP一般需要一起使用。         在ORALCE环境下运行。         首先创建一张表，创建表语句。create table tb\_user(USERNAME varchar2(64)  ,PASSWORDvarchar