JAVA中IP和整数相互转化的方法

JAVA中IP和整数相互转化的方法

本文实例讲述了java中IP和整数相互转化的方法。分享给大家供大家参考。具体分析如下：

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 IllegalArgumhttp://entException(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]) };

}

http://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]) + " ]");

StMugfRHbrring 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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