统计ip,进行合并输出

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统计ip,并且按照规则输出

ip数量如果巨大的话，可以参考分段，多线程执行，本次主要讨论如何安规则输出。

例如输入

1.1.1.1

2.2.2.2

2.2.2.3

1.1.1.2

255.255.255.255

0.0.0.0

1.0.0.2

1.1.0.0

3.3.3.3

1.2.1.2

2.1.2.1

2.2.2.4

输出

0.0.0.0

1.0.0.2

1.1.0.0

1.1.1.1-2

1.2.1.2

2.1.2.1

2.2.2.2-4

3.3.3.3

255.255.255.255

代码如下：

package com.simple;import java.util.Random;public class Study {public static long str2long(String str) {if (str == null) {return 0;}String[] s = str.split("\\.");if (s.length != 4) {return 0;}long t0 = Integer.valueOf(s[0]);long t1 = Integer.valueOf(s[1]);long t2 = Integer.valueOf(s[2]);long t3 = Integer.valueOf(s[3]);return (t0 << 24) + (t1 << 16) + (t2 << 8) + t3;}public static String long2str(long i) {long i1 = i >> 24;long i2 = (i - (i1 << 24)) >> 16;long i3 = (i - (i1 << 24) - (i2 << 16)) >> 8;long i4 = i % 256;return i1 + "." + i2 + "." + i3 + "." + i4;}public static long[] tranfter(String[] s) {if (s == null) {return null;}long[] k = new long[s.length];for (int i = 0; i < s.length; i++) {k[i] = str2long(s[i]);}return k;}public static long[] sort(long[] s) {if (s == null) {return null;}long tmp = 0;for (int i = 0; i < s.length - 1; i++) {for (int j = i + 1; j < s.length; j++) {if (s[i] > s[j]) {tmp = s[j];s[j] = s[i];s[i] = tmp;}}}return s;}public static void printFl(long[] k) {if (k == null) {return;}int tmp = 0;for (int i = 0; i < k.length; i++) {for (int j = i + 1; j < k.length; j++) {if ((k[j] - k[j - 1]) == 1 && (k[j] >> 8 == k[i] >> 8)) {tmp = tmp + 1;} else {break;}}if (tmp == 0) {System.out.println(long2str(k[i]));} else {long s = (k[i] + tmp) % 256;System.out.println(long2str(k[i]) + "-" + s);i=i+tmp;tmp = 0;}}}public static void print(String[] k) {if (k == null) {return;}for (int i = 0; i < k.length; i++) {System.out.println(k[i]);}}public static String[] buildStrs(int size){if(size==0){return null;}Random r=new Random();String[] s=new String[size];for(int i=0;i<size;i++){s[i]=r.nextInt(255)+"."+r.nextInt(255)+"."+r.nextInt(255)+"."+r.nextInt(255);}return s;}public static void main(String[] args) {String[] scr=buildStrs(20);print(scr);long[] s=sort(tranfter(scr));System.out.println("---------------");printFl(s);}}

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