java-根据起止IP获取IP段集合

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintStream;


public class IPTest {

    public static void main(String[] args) {
        /*Long ip = getIp2long("10.0.35.120");
        System.out.println("ip --> " +ip);

        Long ip2 = getIp2long2("10.0.35.120");
        System.out.println("ip2 --> " +ip2);*/

        fun1();
    }





    public static long getIp2long(String ip) {

        ip = ip.trim();

        String[] ips = ip.split("\\.");

        long ip2long = 0L;

        for (int i = 0; i < 4; ++i) {

        ip2long = ip2long << 8 | Integer.parseInt(ips[i]);

        }

        return ip2long;

    }

    public static long getIp2long2(String ip) {

        ip = ip.trim();

        String[] ips = ip.split("\\.");

       long ip1 = Integer.parseInt(ips[0]);

       long ip2 = Integer.parseInt(ips[1]);

       long ip3 = Integer.parseInt(ips[2]);

       long ip4 = Integer.parseInt(ips[3]);



       long ip2long =1L* ip1 * 256 * 256 * 256 + ip2 * 256 * 256 + ip3 * 256 + ip4;

       return ip2long;

    }

    public static void  fun1(){

        PrintStream ps = null;
        try {
            ps = new PrintStream(new File("C:\\IP.txt"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        int ipstart,ipend;

        //String ipstr="10.46.40.1--10.46.88.127";
        String ipstr="1.1.1.1--1.1.1.1";


        String sa[]=ipstr.split("--");
        ipstart=ip2int(sa[0]);
        ipend=ip2int(sa[1]);
        //System.out.println("ipstart --" + ipstart);
        //System.out.println(ipend);
        System.out.println(ipend-ipstart+1);
        String []result=new String[ipend-ipstart+1];
        for(int i=0;i<result.length;i++){
            String ip = int2ip(ipstart+i);
            System.out.println("i --> " +  ip);
            String[] ipArr = ip.split("\\.");
            if("0".equals(ipArr[3]) || "255".equals(ipArr[3])){
                continue;
            }
            ps.println(ip);
        }

    }

    public static String int2ip(int l){
        //System.out.println("l--> " +l);
        int a = l/(256*256*256);
        int b = (l-a*256*256*256)/(256*256);
        int c = (l-a*256*256*256-b*256*256)/256;
        int d = (l-a*256*256*256-b*256*256-c*256);
        //return l/(256*256*256)+"."+l/(256*256)+"."+l/256+"."+l%256;
        return a+"."+b+"."+c+"."+d;
     }

    public static int ip2int(String ip){
        String[] sa=ip.split("\\.");
        return Integer.parseInt(sa[0])*(256*256*256)+Integer.parseInt(sa[1])*(256*256)+Integer.parseInt(sa[2])*256+Integer.parseInt(sa[3]);
    }




}