执行ipconfig /all获取主机所有网卡信息
并分析这些字符串,提取出有效网卡(网卡名称,mac地址,ipv4地址,掩码,网关,dns)
将网卡插入HashMap中,key是网卡的名称,value是网卡对象(包含mac和4个逻辑地址)
请输入网卡的名称,程序通过map的get方法取出此名称对应的网卡对象
根据网卡对象执行其方法getNetId()取出其网卡所在网络号进行打印
getBroadId()取出其广播号进行打印
2: 根据网卡的ip和掩码扫描所有这个子网中可能存在的邻居
然后用ping ..方式进行验证此邻居是否存在,如果存在则将其加入
网卡的邻居集合(HashSet)中
3: 某些邻居有可能开启防火墙导致ping失败,所以验证其是否存在的
恰当方式是先ping它一下,然后用arp -a查看这个邻居是否有arp回应
如果存在arp条目则说明这个邻居是存在的.
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);
} }
}