Java如何在命令行中获取指定数据

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 = "(.+适配器 +.+)\\:"; // 找到所有网卡名字
    HashMap<NetInfo, String> mp = new HashMap<>(); // HashMap存储信息

    Pattern pt = Pattern.compile(expr); // 配对 P，和正则匹配
    Matcher mt = pt.matcher(str); // 开始匹配源字符串 matcher
    System.out.println("\n==========================");

    int MacIndex = 0;// 记录网卡
    while (mt.find()) {
      MacIndex++;
      System.out.println(mt.group(1));
    }
    System.out.println("\n共" + MacIndex + "个网卡");
    if (MacIndex == 0) {
      System.out.println("没有网卡");
      return;
    }

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

    Matcher mt1 = pt.matcher(str); // 开始匹配源字符串 matcher
    // System.out.println("可用网卡");
    int MacUse = 0;// 可以使用的网卡数量
    String[] MacArr = new String[10];// 存储网卡数组(可用网卡)
    while (mt1.find()) { // 循环遍历所有网卡
      // 判断是否可用
      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可用网卡共:" + MacUse + "个");
    System.out.println("\n==========================\n");

    // System.out.println("------------------------------------");
    // 打印出可用的网卡信息
    for (int j = 0; j < MacUse; j++) { // 使用（数组）循环，打印所有可用网卡的所有信息
      String MacInfo = "";// 可用的网卡信息
      String expr1 = "(" + MacArr[j] + "([\\d\\D]*))";
      System.out.println("\n第" + (j + 1) + "个是：" + MacArr[j]);
      Pattern pt1 = Pattern.compile(expr1);
      Matcher mt2 = pt1.matcher(str);
      if (mt2.find()) {
        MacInfo = mt2.group(1);// 把查到的信息赋给变量MaxInfo
      }
      // System.out.println(MacInfo);
      System.out.println("---------------------可用网卡的具体信息如下（第" + (j + 1) + "个网卡）----------------");
      Pattern pt2 = Pattern.compile(" +描述(\\. +)+: (.*)");
      Matcher mt3 = pt2.matcher(MacInfo);// 网卡名
      Pattern pt3 = Pattern.compile(" +物理地址(\\. +)+: (.*)");
      Matcher mt4 = pt3.matcher(MacInfo);// 网卡地址
      Pattern pt5 = Pattern.compile(" +IPv4 地址( +\\.)+ +: +(.*)\\(");
      Matcher mt5 = pt5.matcher(MacInfo);// IP地址
      Pattern pt6 = Pattern.compile(" +子网掩码( +\\.)+ +: +(.*)");
      Matcher mt6 = pt6.matcher(MacInfo);// 子网掩码
      Pattern pt7 = Pattern.compile(" +默认网关(\\. +)+: (.*)");
      Matcher mt7 = pt7.matcher(MacInfo);// 网关
      Pattern pt8 = Pattern.compile(" +DNS 服务器( +\\.)+ +: +(.*)");
      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("网卡名称：" + MacName.trim());
      System.out.println("网卡地址：" + MacIP.trim());
      System.out.println("IPV4地址：" + IPV4.trim());
      System.out.println("子网掩码：" + NetMask.trim());
      System.out.println("默认网关：" + GateWay.trim());
      System.out.println("DNS地址：" + DNS.trim());

    }

    System.out.println("\n=====================使用HashMap遍历输出===========================");
    for (NetInfo h : mp.keySet()) {
      System.out.println("\n网卡名字：" + mp.get(h) + "\n" + h);
      System.out.println("\n-------------");
    }

    System.out.println("======================");
    System.out.println("请输入网卡名：");
    //String inputMacName = new Scanner(System.in).next();//输入网卡名称
    //默认输入：VMware Virtual Ethernet Adapter for VMnet8

    String NetId = "";//记录IP
    String inputMacName ="VMware Virtual Ethernet Adapter for VMnet8";
    System.out.println("您输入的是："+inputMacName);
    for (NetInfo h : mp.keySet()) {
      if((h.getMacName().trim()).equals(inputMacName)){
        System.out.println("\n网卡名字：" + mp.get(h) + "\n" + h);
        NetId = h.getIPV4();
        System.out.println("\nIP："+NetId); //打印出此IP（后面求出网络号、广播号）
      }
    }



    //分解数组
    String []netIPArr = NetId.split("\\.");
    for(int i= 0;i<netIPArr.length;i++){
      System.out.println(netIPArr[i]);
    }

    //求网络号：
      System.out.println("网络号："+netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+0);
      System.out.println("广播号："+netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+255);

    //访问所有邻居
    HashSet<String> nei = new HashSet<>();//存储所有可达的邻居
    for(int i= 1;i<5;i++){
      String str1 = exeCmd("ping "+netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+i);
      System.out.println(str1);
      //判断是否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集合内
        //System.out.println(netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+i);
        nei.add(netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+i);//存储
      }else{//如果ping 不同，使用arp 查看回应
        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 返回数据，也加入到set集合内
          nei.add(netIPArr[0]+"."+netIPArr[1]+"."+netIPArr[2]+"."+i);//存储
        }
      }
    }

    //输出所有可达的邻居
    System.out.println("所有可达的邻居：");
    for(String s : nei){
      System.out.println(s);
    }

  }
}