Java programming example code for converting IP addresses and numbers

Java programming example code for converting IP addresses and numbers

I recently learned that you can access the website by converting the IP address to decimal, octal, or hexadecimal.

Convert an IP address to a number (second algorithm. Use shift left, by bit, or. Higher efficiency .) :

public long ipToLong(String ipAddress) {  long result = 0;  String[] ipAddressInArray = ipAddress.split("\\.");  for (int i = 3; i >= 0; i--) {    long ip = Long.parseLong(ipAddressInArray[3 - i]);    //left shifting 24,16,8,0 and bitwise OR    //1. 192 << 24   //1. 168 << 16   //1. 1  << 8   //1. 2  << 0   result |= ip << (i * 8);  } return result;  } 

Convert numbers to IP addresses. Both algorithms are similar:

//ip = 3232235778  public String longToIp(long ip) { StringBuilder result = new StringBuilder(15);  for (int i = 0; i < 4; i++) {    result.insert(0,Long.toString(ip & 0xff));    if (i < 3) {     result.insert(0,'.');   }    ip = ip >> 8; } return result.toString();  }   //ip = 3232235778  public String longToIp2(long ip) {  return ((ip >> 24) & 0xFF) + "."    + ((ip >> 16) & 0xFF) + "."    + ((ip >> 8) & 0xFF) + "."    + (ip & 0xFF);  } 

Complete code:

public class JavaBitwiseExample {     public static void main(String[] args) {       JavaBitwiseExample obj = new JavaBitwiseExample();       System.out.println("iptoLong : " + obj.ipToLong("192.168.1.2"));     System.out.println("iptoLong2 : " + obj.ipToLong2("192.168.1.2"));       System.out.println("longToIp : " + obj.longToIp(3232235778L));     System.out.println("longToIp2 : " + obj.longToIp2(3232235778L));     }     // example : 192.168.1.2   public long ipToLong(String ipAddress) {       // ipAddressInArray[0] = 192     String[] ipAddressInArray = ipAddress.split("\\.");       long result = 0;     for (int i = 0; i < ipAddressInArray.length; i++) {         int power = 3 - i;       int ip = Integer.parseInt(ipAddressInArray[i]);         // 1. 192 * 256^3       // 2. 168 * 256^2       // 3. 1 * 256^1       // 4. 2 * 256^0       result += ip * Math.pow(256, power);       }       return result;     }     public long ipToLong2(String ipAddress) {       long result = 0;       String[] ipAddressInArray = ipAddress.split("\\.");       for (int i = 3; i >= 0; i--) {         long ip = Long.parseLong(ipAddressInArray[3 - i]);         // left shifting 24,16,8,0 and bitwise OR         // 1. 192 << 24       // 1. 168 << 16       // 1. 1 << 8       // 1. 2 << 0       result |= ip << (i * 8);       }       return result;   }     public String longToIp(long i) {       return ((i >> 24) & 0xFF) +            "." + ((i >> 16) & 0xFF) +            "." + ((i >> 8) & 0xFF) +            "." + (i & 0xFF);     }     public String longToIp2(long ip) {     StringBuilder sb = new StringBuilder(15);       for (int i = 0; i < 4; i++) {         // 1. 2       // 2. 1       // 3. 168       // 4. 192       sb.insert(0, Long.toString(ip & 0xff));         if (i < 3) {         sb.insert(0, '.');       }         // 1. 192.168.1.2       // 2. 192.168.1       // 3. 192.168       // 4. 192       ip = ip >> 8;       }       return sb.toString();   } } 

Summary

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