IP地址，子网掩码，地址池计算Java源码

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package com.metarnet.util;

public class IPPoolUtil {
public static void main(String[] args)
{
System.out.println(getNetMask("255.255.255.0"));

System.out.println(getPoolMax(getNetMask("255.255.255.128")));

System.out.println(getEndIP("10.229.0.1",24).getStartIP());

System.out.println(getEndIP("10.229.0.1",24).getEndIP());
}
public static Nets getEndIP(String StartIP,int netmask)
{
return getEndIP(StartIP,getMask(netmask));
}
public static Nets getEndIP(String StartIP,String netmask)
{
Nets nets = new Nets();
String[] start=Negation(StartIP,netmask).split("\.");
nets.setStartIP(start[0]+"."+start[1]+"."+start[2]+"."+(Integer.valueOf(start[3])+1));
nets.setEndIP(TaskOR(Negation(StartIP,netmask),netmask));
nets.setNetMask(netmask);
return nets;
}
public static String getMask(int masks)
{
if(masks == 1)
return "128.0.0.0";
else if(masks == 2)
return "192.0.0.0";
else if(masks == 3)
return "224.0.0.0";
else if(masks == 4)
return "240.0.0.0";
else if(masks == 5)
return "248.0.0.0";
else if(masks == 6)
return "252.0.0.0";
else if(masks == 7)
return "254.0.0.0";
else if(masks == 8)
return "255.0.0.0";
else if(masks ==9)
return "255.128.0.0";
else if(masks == 10)
return "255.192.0.0";
else if(masks == 11)
return "255.224.0.0";
else if(masks == 12)
return "255.240.0.0";
else if(masks == 13)
return "255.248.0.0";
else if(masks == 14)
return "255.252.0.0";
else if(masks == 15)
return "255.254.0.0";
else if(masks == 16)
return "255.255.0.0";
else if(masks == 17)
return "255.255.128.0";
else if(masks == 18)
return "255.255.192.0";
else if(masks == 19)
return "255.255.224.0";
else if(masks == 20)
return "255.255.240.0";
else if(masks == 21)
return "255.255.248.0";
else if(masks == 22)
return "255.255.252.0";
else if(masks == 23)
return "255.255.254.0";
else if(masks == 24)
return "255.255.255.0";
else if(masks == 25)
return "255.255.255.128";
else if(masks == 26)
return "255.255.255.192";
else if(masks == 27)
return "255.255.255.224";
else if(masks == 28)
return "255.255.255.240";
else if(masks == 29)
return "255.255.255.248";
else if(masks == 30)
return "255.255.255.252";
else if(masks == 31)
return "255.255.255.254";
else if(masks == 32)
return "255.255.255.255";
return "";
}
private static String Negation(String StartIP,String netmask)
{
String[] temp1=StartIP.trim().split("\.");
String[] temp2=netmask.trim().split("\.");
int[] rets=new int[4];
for (int i =0;i<4;i++) {
rets[i]=Integer.parseInt(temp1[i])&Integer.parseInt(temp2[i]);
}
return rets[0]+"."+rets[1]+"."+rets[2]+"."+rets[3];
}
private static String TaskOR(String StartIP,String netmask)
{
String[] temp1=StartIP.trim().split("\.");
String[] temp2=netmask.trim().split("\.");
int[] rets=new int[4];
for (int i =0;i<4;i++) {
rets[i]=255-(Integer.parseInt(temp1[i])^Integer.parseInt(temp2[i]));
}
return rets[0]+"."+rets[1]+"."+rets[2]+"."+(rets[3]-1);
}
public static int getPoolMax(int netmask)
{
if(netmask<=0||netmask>=32)
{
return 0;
}
int bits=32-netmask;
return (int) Math.pow(2,bits) -2;
}
public static int getNetMask(String netmarks)
{
StringBuffer sbf;
String str;
int inetmask=0,count=0;
String[] ipList=netmarks.split("\.");
for(int n=0;n<ipList.length;n++)
{
sbf = toBin(Integer.parseInt(ipList[n]));
str=sbf.reverse().toString();
count=0;
for(int i=0;i<str.length();i++){
i=str.indexOf('1',i);
if(i==-1){break;}
count++;
}
inetmask+=count;
}
return inetmask;
}
private static StringBuffer toBin(int x)
{
StringBuffer result=new StringBuffer();
result.append(x%2);
x/=2;
while(x>0){
result.append(x%2);
x/=2;
}
return result;
}
}
class Nets {
private String StartIP;
private String EndIP;
private String NetMask;
public String getStartIP() {
return StartIP;
}
public void setStartIP(String startIP) {
StartIP = startIP;
}
public String getEndIP() {
return EndIP;
}
public void setEndIP(String endIP) {
EndIP = endIP;
}
public String getNetMask() {
return NetMask;
}
public void setNetMask(String netMask) {
NetMask = netMask;
}
}

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