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Java如何在命令行中獲取指定數(shù)據(jù)

更新時(shí)間：2020年07月30日 08:57:26 作者：勤快的懶羊羊

這篇文章主要介紹了Java如何在命令行中獲取指定數(shù)據(jù),文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友可以參考下

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(guò)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(kāi)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(shuō)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(kāi)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(méi)有網(wǎng)卡");
      return;
    }

    System.out.println("\n==========================");

    Matcher mt1 = pt.matcher(str); // 開(kāi)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] + "([\\d\\D]*))";
      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(wèn)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);
    }

  }
}