命令行中的IP範圍

Question

由於在java中很新，有人可以幫助我檢查COMMAND LINE提供給定範圍內的所有IP。因爲現在這個代碼只能自動運行。 應將IP範圍指定爲起始IP，後跟一個指示範圍內有多少IP的整數。

比如我在cmd中的 「java iPRange 126.172.1.1 7」 運行程序

它會檢查IP的從126.172.1.1到126.172.1.7

這裏是我的代碼：

import java.util.*; 
import java.net.*; 

public class IPRange 
{ 
public static void main(String[] args) 
{ 
    try 
    {  
     long start = host2long("126.172.1.1"); 
     long end = host2long("126.172.1.7"); 
     for (long i=start; i<=end; i++) 
     { 
      System.out.println(long2dotted(i)); 
     } 
    } 
    catch (Exception e) 
    { 
     e.printStackTrace(); 
    } 
} 

public static long host2long(String host) 
{ 
    long ip=0; 
    if (!Character.isDigit(host.charAt(0))) return -1; 
    int[] addr = ip2intarray(host); 
    if (addr == null) return -1; 
    for (int i=0;i<addr.length;++i) 
    { 
     ip += ((long)(addr[i]>=0 ? addr[i] : 0)) << 8*(3-i); 
    } 
    return ip; 
} 

public static int[] ip2intarray(String host) 
{ 
    int[] address = {-1,-1,-1,-1}; 
    int i=0; 
    StringTokenizer tokens = new StringTokenizer(host,"."); 
    if (tokens.countTokens() > 4) return null; 
    while (tokens.hasMoreTokens()) 
    { 
     try 
     { 
      address[i++] = Integer.parseInt(tokens.nextToken()) & 0xFF; 
     } 
     catch(NumberFormatException nfe) 
     { 
      return null; 
     } 
    } 
    return address; 
} 

public static String long2dotted(long address) 
{ 
    StringBuffer sb = new StringBuffer(); 
    for (int i = 0, shift = 24; i < 4; i++, shift -= 8) 
    { 
     long value = (address >> shift) & 0xff; 
     sb.append(value); 
     if (i != 3) 
     { 
      sb.append('.'); 
     } 
    } 
    return sb.toString(); 
} 
} 

輸出：

126.172.1.1 
126.172.1.2 
126.172.1.3 
126.172.1.4 
126.172.1.5 
126.172.1.6 
126.172.1.7 

Answer 1

如果7只是一個簡單的計數，而塔n結尾後綴，應該很簡單。

，只需拆分的起始IP地址爲四個獨立的字符串，然後把它們變成整數a，b，c和d。

然後，它有一個checkIp功能，就會把他們放回一個地址，做任何你需要處理的問題，稱有一個循環，執行以下操作該功能：

• 增量的最後部分d 。
• 如果這是256，請將其重新設置爲0並增量c。
• if 即256，將其重新設置爲0並且增量爲b。
• 最後，如果a是256，則將其重新設置爲0。

在Java代碼方面可以做的伎倆，看到它通過IP給定數量的週期地址開始在你預定基點以下完整的程序：

public class Test { 
    public static void usage(String msg) { 
    System.out.println("*** " + msg); 
    System.out.println("Usage: ipscan <start> <count>"); 
    System.out.println("  <start> is a valid IP address 0.0.0.0 thru 255.255.255.255"); 
    System.out.println("  <count> is the quantity to process"); 
    System.exit(1); 
    } 

    public static void checkIp(int a, int b, int c, int d) { 
    String ipAddr = String.format("%1$d.%2$d.%3$d.%4$d", a, b, c, d); 
    System.out.println("Checking " + ipAddr); 
    } 

    public static void main(String[] arg) { 
    int count = 0, a = 0, b = 0, c = 0, d = 0; 
    if (arg.length != 2) 
     usage("Wrong number of arguments"); 

    String[] comp = arg[0].split("\\."); 
    if (comp.length != 4) 
     usage("'" + arg[0] + "' does not have four components"); 

    try { 
     a = Integer.parseInt(comp[0]); 
    } catch (NumberFormatException e) { 
     usage("First component of '" + arg[0] + "' is not numeric"); 
    } 
    if (a < 0 || a > 255) 
     usage("First component of '" + arg[0] + "' is out of range"); 

    try { 
     b = Integer.parseInt(comp[1]); 
    } catch (NumberFormatException e) { 
     usage("Second component of '" + arg[0] + "' is not numeric"); 
    } 
    if (b < 0 || b > 255) 
     usage("First component of '" + arg[0] + "' is out of range"); 

    try { 
     c = Integer.parseInt(comp[2]); 
    } catch (NumberFormatException e) { 
     usage("Third component of '" + arg[0] + "' is not numeric"); 
    } 
    if (c < 0 || c > 255) 
     usage("First component of '" + arg[0] + "' is out of range"); 

    try { 
     d = Integer.parseInt(comp[3]); 
    } catch (NumberFormatException e) { 
     usage("Fourth component of '" + arg[0] + "' is not numeric"); 
    } 
    if (d < 0 || b > 255) 
     usage("First component of '" + arg[0] + "' is out of range"); 

    try { 
     count = Integer.parseInt(arg[1]); 
    } catch (NumberFormatException e) { 
     usage("Count of '" + arg[1] + "' is not numeric"); 
    } 

    while (count-- > 0) { 
     checkIp(a, b, c, d); 
     if (++d == 256) { 
     d = 0; 
     if (++c == 256) { 
      c = 0; 
      if (++b == 256) { 
      b = 0; 
      if (++a == 256) { 
       a = 0; 
      } 
      } 
     } 
     } 
    } 
    } 
} 

與java Test 255.255.255.250 10給運行此預期的輸出：

Checking 255.255.255.250 
Checking 255.255.255.251 
Checking 255.255.255.252 
Checking 255.255.255.253 
Checking 255.255.255.254 
Checking 255.255.255.255 
Checking 0.0.0.0 
Checking 0.0.0.1 
Checking 0.0.0.2 
Checking 0.0.0.3