根據IP地址與字段掩碼計算網段最大最小IP

package c04;import java.net.UnknownHostException;public class IPNetworkSegmentCalculation { public static void main(String[] args) throws UnknownHostException { String ip = '192.168.126.2'; String mask = '255.255.255.0'; findMask(); } public static void findMask(){ String mask = '255.255.255.0'; String ip = '192.168.126.2'; String[] ipArray = ip.split('[.]'); String[] maskArray = mask.split('[.]'); String minIp = ''; String maxIp = ''; int subMask = 0; for(int i=0 ;i < maskArray.length ; i++){ int maskTmp = Integer.valueOf(maskArray[i]); int ipTmp = Integer.valueOf(ipArray[i]); int mi = maskTmp&ipTmp; //System.out.println('==============='+maskTmp+' '+ipTmp); if(ipTmp == mi && maskTmp==255){minIp = minIp + ipTmp+'.' ;maxIp = maxIp + ipTmp+'.' ;subMask = subMask + 8; }else{minIp = minIp + mi+'.' ;maxIp = maxIp + maxNetSeg(Integer.toBinaryString(maskTmp),mi)+'.';subMask = subMask + subMaskNum(Integer.toBinaryString(maskTmp)); } } minIp = minIp.substring(0,minIp.length()-1); maxIp = maxIp.substring(0,maxIp.length()-1); System.out.println('minip '+minIp); System.out.println('maxip '+maxIp); System.out.println('mask '+subMask); } private static int calculate(int n) { if (n == 0) return 1; return 2 * calculate(n - 1); } private static Integer maxNetSeg(String s1,int mi){ s1 = new StringBuffer(s1).reverse().toString(); if(s1.indexOf('1')!=-1){ int i = s1.indexOf('1'); return mi+calculate(i); }else { return 255; } } private static Integer subMaskNum(String s1){ if(s1.lastIndexOf('1')!=-1){ int i = s1.lastIndexOf('1') + 1; return i; } return 0; }}

Java根據網段計算子網掩碼，起始IP，結束IP

/** * IP的相關計算 * @author zengchaowang * @version 1.0 * */public class IpCaculate { /** * 根據掩碼位數計算掩碼 * @param maskIndex 掩碼位 * @return 子網掩碼 */public static String getNetMask(String maskIndex) {StringBuilder mask = new StringBuilder();Integer inetMask = 0;try {inetMask = Integer.parseInt(maskIndex);} catch (NumberFormatException e) {System.out.println(e.getMessage());return null;}if (inetMask > 32) {return null;}// 子網掩碼為1占了幾個字節int num1 = inetMask / 8;// 子網掩碼的補位位數int num2 = inetMask % 8;int array[] = new int[4];for (int i = 0; i < num1; i++) {array[i] = 255;}for (int i = num1; i < 4; i++) {array[i] = 0;}for (int i = 0; i < num2; num2--) {array[num1] += 1 << 8 - num2;}for (int i = 0; i < 4; i++) {if (i == 3) {mask.append(array[i]);} else {mask.append(array[i] + '.');}}return mask.toString();} /** * 根據網段計算起始IP 網段格式:x.x.x.x/x * 一個網段0一般為網絡地址,255一般為廣播地址. * 起始IP計算:網段與掩碼相與之后加一的IP地址 * @param segment 網段 * @return 起始IP */public static String getStartIp(String segment) {StringBuffer startIp = new StringBuffer();if (segment == null) {return null;}String arr[] = segment.split('/');String ip = arr[0];String maskIndex = arr[1];String mask = IpCaculate.getNetMask(maskIndex);if (4 != ip.split('.').length || mask == null) {return null;}int ipArray[] = new int[4];int netMaskArray[] = new int[4];for (int i = 0; i < 4; i++) {try {ipArray[i] = Integer.parseInt(ip.split('.')[i]);netMaskArray[i] = Integer.parseInt(mask.split('.')[i]);if (ipArray[i] > 255 || ipArray[i] < 0 || netMaskArray[i] > 255 || netMaskArray[i] < 0) {return null;}ipArray[i] = ipArray[i] & netMaskArray[i];if(i==3){startIp.append(ipArray[i]+1);}else{startIp.append(ipArray[i]+'.');}} catch (NumberFormatException e) {System.out.println(e.getMessage());}} return startIp.toString();}/** * 根據網段計算結束IP * @param segment * @return 結束IP */public static String getEndIp(String segment) { StringBuffer endIp=new StringBuffer();String startIp = getStartIp(segment); if (segment == null) {return null;}String arr[] = segment.split('/');String maskIndex = arr[1];//實際需要的IP個數 int hostNumber = 0; int startIpArray[] = new int[4];try {hostNumber=1<<32-(Integer.parseInt(maskIndex));for (int i = 0; i <4; i++) { startIpArray[i] = Integer.parseInt(startIp.split('.')[i]); if(i == 3){ startIpArray[i] = startIpArray[i] - 1;break; } } startIpArray[3] = startIpArray[3] + (hostNumber - 1); } catch (NumberFormatException e) {System.out.println(e.getMessage());} if(startIpArray[3] >255){ int k = startIpArray[3] / 256; startIpArray[3] = startIpArray[3] % 256; startIpArray[2] = startIpArray[2] + k; } if(startIpArray[2] > 255){ int j = startIpArray[2] / 256; startIpArray[2] = startIpArray[2] % 256; startIpArray[1] = startIpArray[1] + j;if(startIpArray[1] > 255){ int k = startIpArray[1] / 256; startIpArray[1] = startIpArray[1] % 256; startIpArray[0] = startIpArray[0] + k;} } for(int i = 0; i < 4; i++){ if(i == 3){ startIpArray[i] = startIpArray[i] - 1; } if('' == endIp.toString()||endIp.length()==0){ endIp.append(startIpArray[i]); }else{ endIp.append('.' + startIpArray[i]); } } return endIp.toString();} }

根據網段計算起始IP 網段格式:x.x.x.x/x

網段內需要的IP數量為：2的（32-掩碼位）次方個。

因為一個網段0一般為網絡地址,255一般為廣播地址， 所以第一個可用IP起始IP計算:網段與掩碼相與之后加一的IP地址，結束IP為通過計算需要的所有IP數然后做累加運算，超過256則進位進行運算。

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