Java字符ip地址和数字ip地址之间的相互转换

Java字符ip地址和数字ip地址之间的相互转换

package com.hxhk.cc.util;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class IPAddressFormatter {
	private static final long serialVersionUID = 1364280016493483133L;
	
	private final static int Num = 32;
	/**
	 * 判断点分十进制IP地址是否正确
	 * @param str
	 * @return
	 */
	public static boolean isIP(String str){	
		Pattern p= Pattern.compile("^([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}$");
		Matcher m =p.matcher(str);
		return m.matches();
	}
	
	/**
	 * 将127.0.0.1 形式的IP地址转换成10进制整数，这里没有进行任何错误处理
	 * 
	 * @param strIP
	 * @return
	 */
	public static long ipToLong(String strIP) {
		long[] ip = new long[4];
		int position1 = strIP.indexOf(".");
		int position2 = strIP.indexOf(".", position1 + 1);
		int position3 = strIP.indexOf(".", position2 + 1);
		ip[0] = Long.parseLong(strIP.substring(0, position1));
		ip[1] = Long.parseLong(strIP.substring(position1 + 1, position2));
		ip[2] = Long.parseLong(strIP.substring(position2 + 1, position3));
		ip[3] = Long.parseLong(strIP.substring(position3 + 1));
		long value = (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];
		return value; // ip1*256*256*256+ip2*256*256+ip3*256+ip4
	}
	
	/**
	 * 将10进制整数形式转换成127.0.0.1形式的IP地址
	 * @param longIP
	 * @return
	 */
	public static String longToIP(long longIP) {
		StringBuffer sb = new StringBuffer("");
		sb.append(String.valueOf(longIP >>> 24));// 直接右移24位
		sb.append(".");
		sb.append(String.valueOf((longIP & 0x00FFFFFF) >>> 16)); // 将高8位置0，然后右移16位
		sb.append(".");
		sb.append(String.valueOf((longIP & 0x0000FFFF) >>> 8));
		sb.append(".");
		sb.append(String.valueOf(longIP & 0x000000FF));
		return sb.toString();
	}
	/**
	 * 根据子网网络位数计算子网掩码（2进制）
	 * @param num
	 * @return String
	 */
	public static String SubNumToBinSubMask(int num) {
		StringBuffer sb = new StringBuffer();
		int location = 0;
		for (; num > 0; num--, location++) {
			sb.append(String.valueOf(1));
		}
		for (; location < Num; location++) {
			sb.append(String.valueOf(0));
		}
		
		return sb.toString();
	}
	/**
	 * 根据２进制IP地址得到点分十进制表示IP地址
	 * @param ipAddress
	 * @return String
	 */
	public static String BinIPToLong(String ipAddress) {
		StringBuffer sb = new StringBuffer();
		Long ip = Long.parseLong(ipAddress, 2);
		return longToIP(ip);
	}
	
	/**
	 * 根据二进制IP地址、子网掩码 获得二进制子网地址
	 * @param iplist 二进制IP地址
	 * @param sublist 二进制子网掩码 
	 * @return String 点分十进制子网掩码 
	 */
	public static String getSubnetAddress(char[] iplist,char[] sublist) {
		StringBuffer sb = new StringBuffer("");
	
		int value = 0;
		int length = (iplist.length>sublist.length)?sublist.length:iplist.length;
		int i = 0;
		int j = Math.abs(iplist.length-sublist.length);
		for (; i < length; i++,j++) {
            value = Integer.parseInt(String.valueOf(iplist[i]))& Integer.parseInt(String.valueOf(sublist[j]));
            sb.append(value);
		}
		return BinIPToLong(sb.toString());
	}
	
	
	/**
	 * 根据IP地址(点分十进制)、子网网络位数获得子网地址
	 * @param num
	 * @param ipAddress IP地址(点分十进制)
	 * @return String 点分十进制子网
	 */
	public static String getSubnetAddress(int num,String ipAddress) {
		String binSubIPAddress = SubNumToBinSubMask(num);
		String ip = Long.toBinaryString(ipToLong(ipAddress));
		StringBuilder sb = new StringBuilder(ip);
		return getSubnetAddress(sb.toString().toCharArray(),binSubIPAddress.toCharArray());
	}
	/**
	 * 根据IP地址(十进制)、子网网络位数获得子网地址
	 * @param num 子网网络位数
	 * @param ipAddress IP地址(十进制)
	 * @return  String 点分十进制子网
	 */
	public static String getSubnetAddress(int num,long ipAddress) {
		String binSubIPAddress = SubNumToBinSubMask(num);
		String ip = Long.toBinaryString(ipAddress);
		StringBuilder sb = new StringBuilder(ip);
		return getSubnetAddress(sb.toString().toCharArray(),binSubIPAddress.toCharArray());
	}
	
	/**
	 * 根据子网地址(十进制)、子网网络位数获得网段最后的IP地址
	 * @param num
	 * @param ip
	 * @return  String 点分十进制子网
	 */
	public static String getEndSubnetAddress(int num,String ip) {
		String ipAddress = Long.toBinaryString(ipToLong(ip));
		
		StringBuilder sb = new StringBuilder();
		for(int i=0;i<Num-ipAddress.length();i++){
			sb.append("0");
		}
		sb.append(ipAddress);
		char[] valuelist = sb.toString().toCharArray();
		for(int k=num;k<Num && k<valuelist.length;k++)
		{
			valuelist[k]='1';
		}
		
		return BinIPToLong(String.valueOf(valuelist));
	}
	/**
	 * 根据子网地址(十进制)、子网网络位数获得网段最后的IP地址
	 * @param num 子网网络位数
	 * @param ip 子网地址(十进制)
	 * @return String 点分十进制
	 */
	public static String getEndSubnetAddress(int num,long ip) {
		String ipAddress = Long.toBinaryString(ip);
		StringBuilder sb = new StringBuilder();
		for(int i=0;i<Num-ipAddress.length();i++){
			sb.append("0");
		}
		sb.append(ipAddress);
		char[] valuelist = sb.toString().toCharArray();
		for(int k=num;k<Num && k<valuelist.length;k++)
		{
			valuelist[k]='1';
		}
		return BinIPToLong(String.valueOf(valuelist));
	}
	public static void main(String[] args) {
	}
}