1.转换类
import com.google.common.base.Strings;
import java.security.InvalidParameterException;
import java.util.Arrays;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
/**
* Created by zhangjy on 2019/4/16.
*/
public class IpV4Utils {
/**
* ip对应的正则表达式
*/
private static final Pattern IP_PATTERN = Pattern.compile(
"(2(5[0-5]{1}|[0-4]\d{1})|[0-1]?\d{1,2})(\.(2(5[0-5]{1}|[0-4]\d{1})|[0-1]?\d{1,2})){3}");
/**
* 将ipV4地址转换为对应的int值
* @param ipAddr ip地址(如192.168.12.11)
* @return 转换为int值
*/
public static int toInt(String ipAddr) {
if (Strings.isNullOrEmpty(ipAddr) || !IP_PATTERN.matcher(ipAddr).matches()) {
throw new InvalidParameterException("IP地址不合法");
}
byte[] integers = toIntArray(ipAddr);
return IntToByteArray.bytesToInt(integers);
}
/**
* 将int值转换为对应的ip地址
* @param ipInteger ip地址的int值
* @return 转换为ip地址(如192.168.12.11)
*/
public static String toIpAddress(int ipInteger) {
String[] str = new String[4];
byte[] bytes = IntToByteArray.intToBytes(ipInteger);
for (int i = 0; i < bytes.length; i++) {
str[i] = Integer.toString(bytes[i] & 0xFF);
}
return Arrays.stream(str).collect(Collectors.joining("."));
}
/**
* 将ipV4地址根据点号分割为4部分,每部分用byte表示
* @param ipAddr ipV4地址如 192.168.11.2
* @return 返回[-64,-88,11,2] 因为 java的byte只能表示 -128~127,所以大于127的值被转换为负数
*/
private static byte[] toIntArray(String ipAddr) {
String[] split = ipAddr.split("\.");
byte[] result = new byte[4];
for (int i = 0; i < split.length; i++) {
result[i] = (byte) (Short.parseShort(split[i]));
}
return result;
}
public static void main(String[] args) {
String ipAddress = "192.168.12.64";
int ipInt = toInt(ipAddress);
System.out.println(ipAddress + "=" + ipInt);
String ipAddress2 = toIpAddress(ipInt);
System.out.println(ipInt + "=" + ipAddress2);
}
}
import com.google.common.base.Strings;
impor
