search
HomeJavaJavaBaseJava determines whether ip

Java determines whether ip

Nov 20, 2019 pm 01:47 PM
java

Java determines whether ip

java使用正则表达式判断是否是IP:

package com.you.dao;  
  
import java.util.regex.Matcher;  
import java.util.regex.Pattern;  
  
/** 
 * @类名:IpAddress 
 * @描述:用正则表达式判断是否为IP 
 */  
public class IpAddress   
{  
    public static class IpAdd  
    {  
        public boolean isIP(String addr)  
        {  
            if(addr.length() < 7 || addr.length() > 15 || "".equals(addr))  
            {  
                return false;  
            }  
            /** 
             * 判断IP格式和范围 
             */  
            String rexp = "([1-9]|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}";  
              
            Pattern pat = Pattern.compile(rexp);    
              
            Matcher mat = pat.matcher(addr);    
              
            boolean ipAddress = mat.find();  
  
            return ipAddress;  
        }  
    }  
  
    /** 
     * @Title : main 
     * @Type : IpAddress 
     * @date : 2014年3月4日 下午10:55:06 
     * @Description : IP可能的范围是0-255.0-255.0-255.0-255 
     * @param args 
     */  
    public static void main(String[] args)   
    {  
        /** 
         * 符合IP地址的范围 
         */  
         String oneAddress = "10.127.30.45";  
         /** 
         * 符合IP地址的长度范围但是不符合格式 
         */  
         String twoAddress = "127.30.45";  
         /** 
         * 不符合IP地址的长度范围 
         */  
         String threeAddress = "7.0.4";  
         /** 
         * 不符合IP地址的长度范围但是不符合IP取值范围 
         */  
         String fourAddress = "255.255.255.2567";  
           
         IpAdd ipAdd = new IpAdd();  
           
         //判断oneAddress是否是IP  
         System.out.println(ipAdd.isIP(oneAddress));  
           
         //判断twoAddress是否是IP  
         System.out.println(ipAdd.isIP(twoAddress));  
           
         //判断threeAddress是否是IP  
         System.out.println(ipAdd.isIP(threeAddress));  
           
         //判断fourAddress是否是IP  
         System.out.println(ipAdd.isIP(fourAddress));  
    }  
  
}

正则表达式定义了字符串的模式。

正则表达式可以用来搜索、编辑或处理文本。

正则表达式并不仅限于某一种语言,但是在每种语言中有细微的差别。

更多java知识请关注java基础教程

The above is the detailed content of Java determines whether ip. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Chat Commands and How to Use Them
1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

MinGW - Minimalist GNU for Windows

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor