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JAVA中IP和整数相互转化的方法

时间:2020-09-03 18:27:44 java语言 我要投稿

JAVA中IP和整数相互转化的方法

  JAVA中IP和整数如何相互转化你知道吗?你对JAVA中IP和整数相互转化的方法了解吗?下面是小编为大家带来的JAVA中IP和整数相互转化的`知识,欢迎阅读。

  一、基本知识点

  IP ——> 整数:

  把IP地址转化为字节数组

  通过左移位(<<)、与(&)、或(|)这些操作转为int

  整数 ——> IP:

  将整数值进行右移位操作(>>>),右移24位,再进行与操作符(&)0xFF,得到的数字即为第一段IP。

  将整数值进行右移位操作(>>>),右移16位,再进行与操作符(&)0xFF,得到的数字即为第二段IP。

  将整数值进行右移位操作(>>>),右移8位,再进行与操作符(&)0xFF,得到的数字即为第三段IP。

  将整数值进行与操作符(&)0xFF,得到的数字即为第四段IP。

  二、java代码示例(IPv4Util.java)

  package michael.utils;

  import java.net.InetAddress;

  public class IPv4Util {

  private final static int INADDRSZ = 4;

  public static byte[] ipToBytesByInet(String ipAddr) {

  try {

  return InetAddress.getByName(ipAddr).getAddress();

  } catch (Exception e) {

  throw new IllegalArgumentException(ipAddr + " is invalid IP");

  }

  }JTA实践:Spring+ATOMIKOS

  public static byte[] ipToBytesByReg(String ipAddr) {

  byte[] ret = new byte[4];

  try {

  String[] ipArr = ipAddr.split(".");

  ret[0] = (byte) (Integer.parseInt(ipArr[0]) & 0xFF);

  ret[1] = (byte) (Integer.parseInt(ipArr[1]) & 0xFF);

  ret[2] = (byte) (Integer.parseInt(ipArr[2]) & 0xFF);

  ret[3] = (byte) (Integer.parseInt(ipArr[3]) & 0xFF);

  return ret;

  } catch (Exception e) {

  throw new IllegalArgumentException(ipAddr + " is invalid IP");

  }

  }

  public static String bytesToIp(byte[] bytes) {

  return new StringBuffer().append(bytes[0] & 0xFF).append('.').append(

  bytes[1] & 0xFF).append('.').append(bytes[2] & 0xFF)

  .append('.').append(bytes[3] & 0xFF).toString();

  }

  public static int bytesToInt(byte[] bytes) {

  int addr = bytes[3] & 0xFF;

  addr |= ((bytes[2] << 8) & 0xFF00);

  addr |= ((bytes[1] << 16) & 0xFF0000);

  addr |= ((bytes[0] << 24) & 0xFF000000);

  return addr;

  }

  public static int ipToInt(String ipAddr) {

  try {

  return bytesToInt(ipToBytesByInet(ipAddr));

  } catch (Exception e) {

  throw new IllegalArgumentException(ipAddr + " is invalid IP");

  }

  }

  public static byte[] intToBytes(int ipInt) {

  byte[] ipAddr = new byte[INADDRSZ];

  ipAddr[0] = (byte) ((ipInt >>> 24) & 0xFF);

  ipAddr[1] = (byte) ((ipInt >>> 16) & 0xFF);

  ipAddr[2] = (byte) ((ipInt >>> 8) & 0xFF);

  ipAddr[3] = (byte) (ipInt & 0xFF);

  return ipAddr;

  }

  public static String intToIp(int ipInt) {

  return new StringBuilder().append(((ipInt >> 24) & 0xff)).append('.')

  .append((ipInt >> 16) & 0xff).append('.').append(

  (ipInt >> 8) & 0xff).append('.').append((ipInt & 0xff))

  .toString();

  }

  public static int[] getIPIntScope(String ipAndMask) {

  String[] ipArr = ipAndMask.split("/");

  if (ipArr.length != 2) {

  throw new IllegalArgumentException("invalid ipAndMask with: "

  + ipAndMask);

  }

  int netMask = Integer.valueOf(ipArr[1].trim());

  if (netMask < 0 || netMask > 31) {

  throw new IllegalArgumentException("invalid ipAndMask with: "

  + ipAndMask);

  }

  int ipInt = IPv4Util.ipToInt(ipArr[0]);

  int netIP = ipInt & (0xFFFFFFFF << (32 - netMask));

  int hostScope = (0xFFFFFFFF >>> netMask);

  return new int[] { netIP, netIP + hostScope };

  }

  public static String[] getIPAddrScope(String ipAndMask) {

  int[] ipIntArr = IPv4Util.getIPIntScope(ipAndMask);

  return new String[] { IPv4Util.intToIp(ipIntArr[0]),

  IPv4Util.intToIp(ipIntArr[0]) };

  }

  public static int[] getIPIntScope(String ipAddr, String mask) {

  int ipInt;

  int netMaskInt = 0, ipcount = 0;

  try {

  ipInt = IPv4Util.ipToInt(ipAddr);

  if (null == mask || "".equals(mask)) {

  return new int[] { ipInt, ipInt };

  }

  netMaskInt = IPv4Util.ipToInt(mask);

  ipcount = IPv4Util.ipToInt("255.255.255.255") - netMaskInt;

  int netIP = ipInt & netMaskInt;

  int hostScope = netIP + ipcount;

  return new int[] { netIP, hostScope };

  } catch (Exception e) {

  throw new IllegalArgumentException("invalid ip scope express ip:"

  + ipAddr + " mask:" + mask);

  }

  }

  public static String[] getIPStrScope(String ipAddr, String mask) {

  int[] ipIntArr = IPv4Util.getIPIntScope(ipAddr, mask);

  return new String[] { IPv4Util.intToIp(ipIntArr[0]),

  IPv4Util.intToIp(ipIntArr[0]) };

  }

  public static void main(String[] args) throws Exception {

  String ipAddr = "192.168.8.1";

  byte[] bytearr = IPv4Util.ipToBytesByInet(ipAddr);

  StringBuffer byteStr = new StringBuffer();

  for (byte b : bytearr) {

  if (byteStr.length() == 0) {

  byteStr.append(b);

  } else {

  byteStr.append("," + b);

  }

  }

  System.out.println("IP: " + ipAddr + " ByInet --> byte[]: [ " + byteStr

  + " ]");

  bytearr = IPv4Util.ipToBytesByReg(ipAddr);

  byteStr = new StringBuffer();

  for (byte b : bytearr) {

  if (byteStr.length() == 0) {

  byteStr.append(b);

  } else {

  byteStr.append("," + b);

  }

  }

  System.out.println("IP: " + ipAddr + " ByReg --> byte[]: [ " + byteStr

  + " ]");

  System.out.println("byte[]: " + byteStr + " --> IP: "

  + IPv4Util.bytesToIp(bytearr));

  int ipInt = IPv4Util.ipToInt(ipAddr);

  System.out.println("IP: " + ipAddr + " --> int: " + ipInt);

  System.out.println("int: " + ipInt + " --> IP: "

  + IPv4Util.intToIp(ipInt));

  String ipAndMask = "192.168.1.1/24";

  int[] ipscope = IPv4Util.getIPIntScope(ipAndMask);

  System.out.println(ipAndMask + " --> int地址段:[ " + ipscope[0] + ","

  + ipscope[1] + " ]");

  System.out.println(ipAndMask + " --> IP 地址段:[ "

  + IPv4Util.intToIp(ipscope[0]) + ","

  + IPv4Util.intToIp(ipscope[1]) + " ]");

  String ipAddr1 = "192.168.1.1", ipMask1 = "255.255.255.0";

  int[] ipscope1 = IPv4Util.getIPIntScope(ipAddr1, ipMask1);

  System.out.println(ipAddr1 + " , " + ipMask1 + " --> int地址段 :[ "

  + ipscope1[0] + "," + ipscope1[1] + " ]");

  System.out.println(ipAddr1 + " , " + ipMask1 + " --> IP地址段 :[ "

  + IPv4Util.intToIp(ipscope1[0]) + ","

  + IPv4Util.intToIp(ipscope1[1]) + " ]");

  }

  }

  希望本文所述对大家的java程序设计有所帮助。


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