1.執(zhí)行ipconfig /all獲取主機(jī)所有網(wǎng)卡信息

并分析這些字符串,提取出有效網(wǎng)卡(網(wǎng)卡名稱,mac地址,ipv4地址,掩碼,網(wǎng)關(guān),dns)

將網(wǎng)卡插入HashMap中,key是網(wǎng)卡的名稱,value是網(wǎng)卡對(duì)象(包含mac和4個(gè)邏輯地址)

請(qǐng)輸入網(wǎng)卡的名稱,程序通過map的get方法取出此名稱對(duì)應(yīng)的網(wǎng)卡對(duì)象

根據(jù)網(wǎng)卡對(duì)象執(zhí)行其方法getNetId()取出其網(wǎng)卡所在網(wǎng)絡(luò)號(hào)進(jìn)行打印

getBroadId()取出其廣播號(hào)進(jìn)行打印

2.根據(jù)網(wǎng)卡的ip和掩碼掃描所有這個(gè)子網(wǎng)中可能存在的鄰居

然后用ping ..方式進(jìn)行驗(yàn)證此鄰居是否存在,如果存在則將其加入

網(wǎng)卡的鄰居集合(HashSet)中

3.某些鄰居有可能開啟防火墻導(dǎo)致ping失敗,所以驗(yàn)證其是否存在的

恰當(dāng)方式是先ping它一下,然后用arp -a查看這個(gè)鄰居是否有arp回應(yīng)

如果存在arp條目則說明這個(gè)鄰居是存在的.

代碼實(shí)例

package day2020072501;import java.io.BufferedReader;import java.io.InputStreamReader;import java.util.HashMap;import java.util.HashSet;import java.util.Scanner;import java.util.Set;import java.util.regex.Matcher;import java.util.regex.Pattern;public class Zzbds { public static String exeCmd(String commandStr) { BufferedReader br = null; try { Process p = Runtime.getRuntime().exec(commandStr); br = new BufferedReader(new InputStreamReader(p.getInputStream())); String line = null; StringBuilder sb = new StringBuilder(); while ((line = br.readLine()) != null) {sb.append(line + 'n'); } // System.out.println(sb.toString()); return sb.toString(); } catch (Exception e) { e.printStackTrace(); } finally { if (br != null) {try { br.close();} catch (Exception e) { e.printStackTrace();} } } return commandStr; } public static void main(String[] args) { String str = exeCmd('ipconfig /all'); String expr = '(.+適配器 +.+):'; // 找到所有網(wǎng)卡名字 HashMap<NetInfo, String> mp = new HashMap<>(); // HashMap存儲(chǔ)信息 Pattern pt = Pattern.compile(expr); // 配對(duì) P，和正則匹配 Matcher mt = pt.matcher(str); // 開始匹配源字符串 matcher System.out.println('n=========================='); int MacIndex = 0;// 記錄網(wǎng)卡 while (mt.find()) { MacIndex++; System.out.println(mt.group(1)); } System.out.println('n共' + MacIndex + '個(gè)網(wǎng)卡'); if (MacIndex == 0) { System.out.println('沒有網(wǎng)卡'); return; } System.out.println('n=========================='); Matcher mt1 = pt.matcher(str); // 開始匹配源字符串 matcher // System.out.println('可用網(wǎng)卡'); int MacUse = 0;// 可以使用的網(wǎng)卡數(shù)量 String[] MacArr = new String[10];// 存儲(chǔ)網(wǎng)卡數(shù)組(可用網(wǎng)卡) while (mt1.find()) { // 循環(huán)遍歷所有網(wǎng)卡 // 判斷是否可用 if (NetWorkUtil.NetWorkavailable(mt1.group())) {MacArr[MacUse] = mt1.group();MacUse++;// System.out.println(mt1.group()); } } for (int i = 0; i < MacUse; i++) { System.out.println(MacArr[i]); } System.out.println('n可用網(wǎng)卡共:' + MacUse + '個(gè)'); System.out.println('n==========================n'); // System.out.println('------------------------------------'); // 打印出可用的網(wǎng)卡信息 for (int j = 0; j < MacUse; j++) { // 使用（數(shù)組）循環(huán)，打印所有可用網(wǎng)卡的所有信息 String MacInfo = '';// 可用的網(wǎng)卡信息 String expr1 = '(' + MacArr[j] + '([dD]*))'; System.out.println('n第' + (j + 1) + '個(gè)是：' + MacArr[j]); Pattern pt1 = Pattern.compile(expr1); Matcher mt2 = pt1.matcher(str); if (mt2.find()) {MacInfo = mt2.group(1);// 把查到的信息賦給變量MaxInfo } // System.out.println(MacInfo); System.out.println('---------------------可用網(wǎng)卡的具體信息如下（第' + (j + 1) + '個(gè)網(wǎng)卡）----------------'); Pattern pt2 = Pattern.compile(' +描述(. +)+: (.*)'); Matcher mt3 = pt2.matcher(MacInfo);// 網(wǎng)卡名 Pattern pt3 = Pattern.compile(' +物理地址(. +)+: (.*)'); Matcher mt4 = pt3.matcher(MacInfo);// 網(wǎng)卡地址 Pattern pt5 = Pattern.compile(' +IPv4 地址( +.)+ +: +(.*)('); Matcher mt5 = pt5.matcher(MacInfo);// IP地址 Pattern pt6 = Pattern.compile(' +子網(wǎng)掩碼( +.)+ +: +(.*)'); Matcher mt6 = pt6.matcher(MacInfo);// 子網(wǎng)掩碼 Pattern pt7 = Pattern.compile(' +默認(rèn)網(wǎng)關(guān)(. +)+: (.*)'); Matcher mt7 = pt7.matcher(MacInfo);// 網(wǎng)關(guān) Pattern pt8 = Pattern.compile(' +DNS 服務(wù)器( +.)+ +: +(.*)'); Matcher mt8 = pt8.matcher(MacInfo);// DNS String MacName = ''; String MacIP = ''; String IPV4 = ''; String NetMask = ''; String GateWay = ''; String DNS = ''; if (mt3.find() && mt4.find() && mt5.find() && mt6.find() && mt7.find() && mt8.find()) {MacName = mt3.group(2);MacIP = mt4.group(2);IPV4 = mt5.group(2);NetMask = mt6.group(2);GateWay = mt7.group(2);DNS = mt8.group(2);mp.put(new NetInfo(MacName,MacIP, IPV4, NetMask, GateWay, DNS), MacName); } System.out.println('網(wǎng)卡名稱：' + MacName.trim()); System.out.println('網(wǎng)卡地址：' + MacIP.trim()); System.out.println('IPV4地址：' + IPV4.trim()); System.out.println('子網(wǎng)掩碼：' + NetMask.trim()); System.out.println('默認(rèn)網(wǎng)關(guān)：' + GateWay.trim()); System.out.println('DNS地址：' + DNS.trim()); } System.out.println('n=====================使用HashMap遍歷輸出==========================='); for (NetInfo h : mp.keySet()) { System.out.println('n網(wǎng)卡名字：' + mp.get(h) + 'n' + h); System.out.println('n-------------'); } System.out.println('======================'); System.out.println('請(qǐng)輸入網(wǎng)卡名：'); //String inputMacName = new Scanner(System.in).next();//輸入網(wǎng)卡名稱 //默認(rèn)輸入：VMware Virtual Ethernet Adapter for VMnet8 String NetId = '';//記錄IP String inputMacName ='VMware Virtual Ethernet Adapter for VMnet8'; System.out.println('您輸入的是：'+inputMacName); for (NetInfo h : mp.keySet()) { if((h.getMacName().trim()).equals(inputMacName)){System.out.println('n網(wǎng)卡名字：' + mp.get(h) + 'n' + h);NetId = h.getIPV4();System.out.println('nIP：'+NetId); //打印出此IP（后面求出網(wǎng)絡(luò)號(hào)、廣播號(hào)） } } //分解數(shù)組 String []netIPArr = NetId.split('.'); for(int i= 0;i<netIPArr.length;i++){ System.out.println(netIPArr[i]); } //求網(wǎng)絡(luò)號(hào)： System.out.println('網(wǎng)絡(luò)號(hào)：'+netIPArr[0]+'.'+netIPArr[1]+'.'+netIPArr[2]+'.'+0); System.out.println('廣播號(hào)：'+netIPArr[0]+'.'+netIPArr[1]+'.'+netIPArr[2]+'.'+255); //訪問所有鄰居 HashSet<String> nei = new HashSet<>();//存儲(chǔ)所有可達(dá)的鄰居 for(int i= 1;i<5;i++){ String str1 = exeCmd('ping '+netIPArr[0]+'.'+netIPArr[1]+'.'+netIPArr[2]+'.'+i); System.out.println(str1); //判斷是否Ping 通 Pattern pt9 = Pattern.compile('TTL'); Matcher mt9 = pt9.matcher(str1); if (mt9.find()){//如果能ping 通，直接加入到set集合內(nèi)//System.out.println(netIPArr[0]+'.'+netIPArr[1]+'.'+netIPArr[2]+'.'+i);nei.add(netIPArr[0]+'.'+netIPArr[1]+'.'+netIPArr[2]+'.'+i);//存儲(chǔ) }else{//如果ping 不同，使用arp 查看回應(yīng)String str2 = exeCmd('arp -a');Pattern pt10 = Pattern.compile(netIPArr[0]+'.'+netIPArr[1]+'.'+netIPArr[2]+'.'+i);Matcher mt10 = pt10.matcher(str2);if (mt10.find()){//如果arp 返回?cái)?shù)據(jù)，也加入到set集合內(nèi) nei.add(netIPArr[0]+'.'+netIPArr[1]+'.'+netIPArr[2]+'.'+i);//存儲(chǔ)} } } //輸出所有可達(dá)的鄰居 System.out.println('所有可達(dá)的鄰居：'); for(String s : nei){ System.out.println(s); } }}

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