1.執(zhí)行ipconfig /all獲取主機所有網(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,dns)
將網(wǎng)卡插入HashMap中,key是網(wǎng)卡的名稱,value是網(wǎng)卡對象(包含mac和4個邏輯地址)
請輸入網(wǎng)卡的名稱,程序通過map的get方法取出此名稱對應的網(wǎng)卡對象
根據(jù)網(wǎng)卡對象執(zhí)行其方法getNetId()取出其網(wǎng)卡所在網(wǎng)絡號進行打印
getBroadId()取出其廣播號進行打印
2.根據(jù)網(wǎng)卡的ip和掩碼掃描所有這個子網(wǎng)中可能存在的鄰居
然后用ping ..方式進行驗證此鄰居是否存在,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致ping失敗,所以驗證其是否存在的
恰當方式是先ping它一下,然后用arp -a查看這個鄰居是否有arp回應
如果存在arp條目則說明這個鄰居是存在的.
代碼實例
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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存儲信息 Pattern pt = Pattern.compile(expr); // 配對 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"); 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] + "([\\d\\D]*))"; System.out.println("\n第" + (j + 1) + "個是：" + 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(" +默認網(wǎng)關(\\. +)+: (.*)"); Matcher mt7 = pt7.matcher(MacInfo);// 網(wǎng)關 Pattern pt8 = Pattern.compile(" +DNS 服務器( +\\.)+ +: +(.*)"); 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("默認網(wǎng)關：" + 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("請輸入網(wǎng)卡名："); //String inputMacName = new Scanner(System.in).next();//輸入網(wǎng)卡名稱 //默認輸入：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)絡號、廣播號） } } //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)絡號： System.out.println("網(wǎng)絡號："+netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+0); System.out.println("廣播號："+netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+255); //訪問所有鄰居 HashSet<String> nei = new HashSet<>();//存儲所有可達的鄰居 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 //System.out.println(netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+i); nei.add(netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+i);//存儲 }else{//如果ping 不同，使用arp 查看回應 String str2 = exeCmd("arp -a"); Pattern pt10 = Pattern.compile(netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+i); Matcher mt10 = pt10.matcher(str2); nei.add(netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+i);//存儲 } } } //輸出所有可達的鄰居 System.out.println("所有可達的鄰居："); for(String s : nei){ System.out.println(s); } }} |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://www.cnblogs.com/lwl80/p/13383047.html
