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积累点关于Java获取IP 和Host，判断操作系统类型方面的知识，现在多积累点，以后就能直接拿来用多好。

1.获取IP，host用JDK自带的java.net.InetAddress.java来完成

//获取IP
String ipAddress = InetAddress.getLocalHost().getHostAddress();//获取hostName
String hostName = InetAddress.getLocalHost().getHostName();//获取canonicalHostName
String canonicalHostName = InetAddress.getLocalHost().getCanonicalHostName();

 后面两个方法的区别是，一个是主机名，一个是主机名的别名

2. 判断windows系统的方法

public static boolean isWindows() {return System.getProperty("os.name").indexOf("Window") != -1;}

 利用JVM的属性来判断

3. 将IP地址变为byte数组，下面方法只对IPV4的地址进行转换

public static byte[] parseIPV4Address(String ipAddressStr) throws IllegalArgumentException {StringTokenizer tok = new StringTokenizer(ipAddressStr, ".");int count = 0;byte ipAddressBytes[] = new byte[4];while (tok.hasMoreTokens()) {String ipAddressPartStr = tok.nextToken();int ipAddressPartInt = -1;boolean parseError = false;try {ipAddressPartInt = Integer.parseInt(ipAddressPartStr);} catch (NumberFormatException e) {parseError = true;}if (parseError || ipAddressPartInt > 255)throw new IllegalArgumentException((new StringBuilder()).append("String \"").append(ipAddressPartStr).append("\" does not contain a valid byte integer value").toString());byte ipAddressPart = (byte) ipAddressPartInt;if (count >= 4)throw new IllegalArgumentException((new StringBuilder()).append("String \"").append(ipAddressPartStr).append("\" does not contain a valid IPV4 address").toString());ipAddressBytes[count++] = ipAddressPart;}return ipAddressBytes;}