Java将ip字符串转换成整数

Java将ip字符串转换成整数

/**
 * @author SunChong
 */
public class IpUtil {
	
	/**
	 * 将字符串型ip转成int型ip
	 * @param strIp
	 * @return
	 */
	public static int Ip2Int(String strIp){
		String[] ss = strIp.split("\\.");
		if(ss.length != 4){
			return 0;
		}
		byte[] bytes = new byte[ss.length];
		for(int i = 0; i < bytes.length; i++){
			bytes[i] = (byte) Integer.parseInt(ss[i]);
		}
		return byte2Int(bytes);
	}
	/**
	 * 将int型ip转成String型ip
	 * @param intIp
	 * @return
	 */
	public static String int2Ip(int intIp){
		byte[] bytes = int2byte(intIp);
		StringBuilder sb = new StringBuilder();
		for(int i = 0; i < 4; i++){
			sb.append(bytes[i] & 0xFF);
			if(i < 3){
				sb.append(".");
			}
		}
		return sb.toString();
	}
	
	private static byte[] int2byte(int i) {
        byte[] bytes = new byte[4];
        bytes[0] = (byte) (0xff & i);
        bytes[1] = (byte) ((0xff00 & i) >> 8);
        bytes[2] = (byte) ((0xff0000 & i) >> 16);
        bytes[3] = (byte) ((0xff000000 & i) >> 24);
        return bytes;
    }
	private static int byte2Int(byte[] bytes) {
        int n = bytes[0] & 0xFF;
        n |= ((bytes[1] << 8) & 0xFF00);
        n |= ((bytes[2] << 16) & 0xFF0000);
        n |= ((bytes[3] << 24) & 0xFF000000);
        return n;
    }
	
	public static void main(String[] args) {
		String ip1 = "192.168.0.1";
		int intIp = Ip2Int(ip1);
		String ip2 = int2Ip(intIp);
		System.out.println(ip2.equals(ip1));
	}
}