根據ip地址和子網掩碼獲取廣播地址的java實現

/**

* 獲取廣播地址

* */

public static String getBroadcastAddress(String subnet, String ip) {

String[] ips = ip.split("\\.");

String[] subnets = subnet.split("\\.");

StringBuffer sb = new StringBuffer();

for (int i = 0; i < ips.length; i++) {

ips[i] = String.valueOf((~Integer.parseInt(subnets[i]))

| (Integer.parseInt(ips[i])));

sb.append(turnToStr(Integer.parseInt(ips[i])));

if (i != (ips.length - 1))

sb.append(".");

}

return turnToIp(sb.toString());

}

private static String turnToStr(int num) {

String str = "";

str = Integer.toBinaryString(num);

int len = 8 - str.length();

for (int i = 0; i < len; i++) {

str = "0" + str;

}

if (len < 0)

str = str.substring(24, 32);

return str;

}

/**

* 轉換成Str

* */

private static String turnToIp(String str) {

String[] ips = str.split("\\.");

StringBuffer sb = new StringBuffer();

for (int i = 0; i < ips.length; i++) {

sb.append(turnToInt(ips[i]));

sb.append(".");

}

sb.deleteCharAt(sb.length() - 1);

return sb.toString();

}

/**

* 轉換成int

* */

private static int turnToInt(String str) {

int total = 0;

int top = str.length();

for (int i = 0; i < str.length(); i++) {

String h = String.valueOf(str.charAt(i));

top--;

total += ((int) Math.pow(2, top)) * (Integer.parseInt(h));

}

return total;

}

總結

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