IPアドレスとIntegerタイプの相互転送

import java.net.InetAddress;
import java.net.UnknownHostException;

public class TypeConversionUtil {

	/**
          * IP 
	 * convert ipaddr like 1.1.1.1 to int
	 * @param str
	 * @return
	 */
	public static int convertString2Ipaddr(String str){
		
		if (ValidateUtil.isBlank(str)){
			return -1;
		}
		
		InetAddress addr = null;
		
		try {
			addr = InetAddress.getByName(str);
		} catch (UnknownHostException e) {
			e.printStackTrace();
			return -1;
		}
	
		return convertBytes2Int(addr.getAddress());
	}

	/**
	 * convert byte[4] to int， 
	 * @param addr
	 * @return
	 */
	public static int convertBytes2Int(byte[] addr){
		
		int address = 0;
		if (addr != null) {
		    if (addr.length == 4) {
			address  = addr[3] & 0xFF;
			address |= ((addr[2] << 8) & 0xFF00);
			address |= ((addr[1] << 16) & 0xFF0000);
			address |= ((addr[0] << 24) & 0xFF000000);
		    } 
		} 
		
		return address;
	}


 
	/**
          *  IP 
	 * convert ipaddr like 172903153 to String 10.78.74.241
	 * @param ipaddr
	 * @return
	 */
	public static String convertIpaddr2String(int ipaddr){
		
		byte[] bytes = convertInt2Bytes(ipaddr);
		
		InetAddress addr = null;
		
		try {
			addr = InetAddress.getByAddress(bytes);
		} catch (UnknownHostException e) {
			e.printStackTrace();
			return null;
		}
		
		return addr.getHostAddress();
	}

	/**
	 * convert int to byte[4]
	 * @param value
	 * @return
	 */
	public static byte[] convertInt2Bytes(int value){
		
		byte[] addr = new byte[4];

		addr[0] = (byte) ((value >>> 24) & 0xFF);
		addr[1] = (byte) ((value >>> 16) & 0xFF);
		addr[2] = (byte) ((value >>> 8) & 0xFF);
		addr[3] = (byte) (value & 0xFF);
		return addr;
	
	}
}