生成指定长度的随机数,获取本机ip,mac
例一：
public static String randomCreditKey(int strLength) {
Random rm = new Random();
double pross = (1 + rm.nextDouble()) * Math.pow(10, strLength);
String fixLenthString = String.valueOf(pross);
return fixLenthString.substring(2, strLength + 2);
}
String randomNum = IpUtil.randomCreditKey(16)+IpUtil.randomCreditKey(10)+IpUtil.randomCreditKey(10);
例二：
public static String getRandom(int paramInt)
{
String str = "abcdefghijklmnopqrstuvwxyz0123456789";
Random localRandom = new Random();
StringBuffer localStringBuffer = new StringBuffer();
for (int i = 0; i < paramInt; i++)
{
int j = localRandom.nextInt(str.length());
localStringBuffer.append(str.charAt(j));
}
return localStringBuffer.toString();
}
String randomNum =GuardUtil.getRandom(36);
public static String getLocalMac() {
Enumeration var0 = null;
try {
var0 = NetworkInterface.getNetworkInterfaces();
} catch (SocketException var7) {
var7.printStackTrace();
}
while (true) {
if (var0.hasMoreElements()) {
NetworkInterface var1 = (NetworkInterface) var0.nextElement();
byte[] var2 = null;
try {
var2 = var1.getHardwareAddress();
if (var2 == null) {
continue;
}
} catch (SocketException var8) {
var8.printStackTrace();
}
StringBuffer var3 = new StringBuffer("");
for (int var4 = 0; var4 < var2.length; ++var4) {
if (var4 != 0) {
var3.append("-");
}
int var5 = var2[var4] & 255;
String var6 = Integer.toHexString(var5);
if (var6.length() == 1) {
var3.append("0" + var6.toUpperCase());
} else {
var3.append(var6.toUpperCase());
}
}
return var3.toString();
}
return "00-50-56-C0-00-08";
}
}
public static String getLocalIp() {
try {
return InetAddress.getLocalHost().getHostAddress();
} catch (UnknownHostException localUnknownHostException) {
localUnknownHostException.printStackTrace();
}
return "192.168.2.16";
}