InetAddress类:
public class NetTest { /**设定缓存的属性**/ public static final String PROPERTY_NETCACHE = "networkaddress.cache.ttl"; /**异常信息缓存属性**/ public static final String PROPERTY_EXCEPTIONCACHE = "networkaddress.cache.negative.ttl"; public static void main(String[] args) throws IOException { /* * 初始化InetAddress host既可以是主机名也可以是ip地址 addr是以字节数组表示的ip地址 * 1:InetAddress.getByName(String host) 返回该主机所对应的第一个主机名/ip * 2:InetAddress.getLocalHost() 返回本地主机 主机名/ip * 3:InetAddress.getAllByName(String host) 返回该主机对应的所有 主机名/ip * 4:InetAddress.getByAddress(byte[] addr) 返回 主机名/ip * 5:InetAddress.getByAddress(String host, byte[] addr) 返回主机名/ip */ InetAddress ia = InetAddress.getByName("www.baidu.com"); out.println(ia); InetAddress localIp = InetAddress.getLocalHost(); out.println(localIp); InetAddress[] allIpAddress = InetAddress.getAllByName("www.google.com"); for (InetAddress address : allIpAddress){ System.out.println(address); } InetAddress byAddress = InetAddress.getByAddress(new byte[]{74,125,71,103}); out.println(byAddress); InetAddress byHostAddress = InetAddress.getByAddress("www.baidu.com", new byte[]{119,75,218-256,45}); out.println(byHostAddress); /* * 设置缓存超时 单位秒 -1表示一直缓存 * 设置了缓存机制,第二次访问该dns服务器就直接读缓存 */ Security.setProperty(PROPERTY_NETCACHE, "-1"); /* * 设置异常信息缓存秒数 */ Security.setProperty(PROPERTY_EXCEPTIONCACHE, "10"); //判断能否连接 System.out.println(ia.isReachable(100)); /* * 获取ip字符串 */ out.println(ia.getHostAddress()); /* * 获取该ip地址的主机别名 InetAddress由ip创建 返回主机名 */ out.println(ia.getHostName()); /* * 获取该ip地址的主机名 */ out.println(ia.getCanonicalHostName()); /* * 获取字节数组组成的ip地址 */ out.println(ia.getAddress()); /* * 使用ip创建的InetAddressgetHostName()才访问服务器 */ out.println(byAddress.getHostName()); /* * Mire字符串的转换 * URLDecoder 特殊---->一般 URLEncoder 一般---->特殊 */ //解码 String keyWord = URLDecoder.decode("%E8%8D%89%E6%B3%A5%E9%A9%AC", "UTF-8"); out.println(keyWord); //编码 String keyWordd = URLEncoder.encode(keyWord, "UTF-8"); out.println(keyWordd); } }