关于Internet的地址查找(InetAddress).docx

根据主机名查找IP地址package ernet;import .InetAddress;import .UnknownHostException;public class InternetTest public static void main(String args ) throws UnknownHostException try InetAddress addr= InetAddress.getByName(); System.out.println(addr); catch(UnknownHostException ex) System.out.println(Could not find ); 得到某个网站的全部Ip地址列表：package ernet;import .InetAddress;import .UnknownHostException;public class InternetTest public static void main(String args ) throws UnknownHostException try InetAddress addr= InetAddress.getAllByName(); for(int i=0;iaddr.length;i+) System.out.println(addri); catch(UnknownHostException ex) System.out.println(Could not find ); 得到本机主机名：InetAddress addr=Inetaddress.getlocalHost();String a = addr.getHostName();得到本机IP地址：InetAddress addr=Inetaddress.getlocalHost();String a = addr.getHostAddress();给定地址,得到主机名:InetAddress m=InetAddress.getByName(00); String addr=m.getHostName(); System.out.println(addr);判断IP地址是Ipv4 还是Ipv6 package ernet;import .InetAddress;import .UnknownHostException;public class AddressTest public static int getVersion(InetAddress addr ) byte address=addr.getAddress(); if(address.length=4) return 4; else if(address.length=16) return 6; else return -1; public static void main(String args) throws UnknownHostException InetAddress ad=InetAddress.getByName(); System.out.println(getVersion(ad); 下面是一些常用的函数：Public boolean isAnyLocalAddess()判断是否为通配地址IPv4 为0：0：0：0 IPv6 为0：0：0：0：0：0：0：0Public boolean isLoopbackAddress()判断是否为回环地址IPv4 Ipv6 0：0：0：0：0：0：0：1Public boolean isLinkLocalAddress()地址为Ipv6 本地连接地址时为truePublic boolean isSiteLocalAddress()地址为Ipv6 本地网站地址时返回truePublic boolean isMulticastAddress()判断是否为组播地址Public boolean isMCGlobal()是否为全球组播地址Public boolean isMCNodeLocal()判断是否为本地接口组播地址Public boolean isMCLinkLocal()是否为子网范围组播地址Public boolean iaMCSiteLocal()是否为网站范围组播地址Public boolean isMCorgLocal()是否为组织范围组播地址package ernet;import .InetAddress;import .UnknownHostException;public class IpCharacteristic public static void main(String args) try InetAddress addr=InetAddress.getByName(args0); if(addr.isAnyLocalAddress() System.out.println(addr+is a wildcard address); if(addr.isLoopbackAddress() System.out.println(addr+is a loopback address); if(addr.isLinkLocalAddress() System.out.println(addr+is a link-local address); else if(addr.isSiteLocalAddress() System.out.println(addr+is a site-local address); else System.out.println(addr+is a global address); if(addr.isMulticastAddress() if(addr.isMCGlobal() System.out.println(addr+is a MCGloball address); else if(addr.isMCOrgLocal() System.out.println(addr+is a MCOrgLocal address); else if(addr.isMCLinkLocal() System.out.println(addr+is a MCLinkLocal address); else if(addr.isMCNodeLocal() System.out.println(addr+is a MCNodeLocal address); else if(addr.isMCSiteLocal() System.out.println(addr+is a MCSiteLocal address); else System.out.println(addr+is an unknown multicast address); else System.out.println(addr+is a unicast address); catch(UnknownHostException e) System.err.println(Could not resovle+args0); /测试可达性Public boolean isReachable(int timeout)throws IOExceptionPublic boolean isReachable(NetworkInterface interface,int ttl,int timeout)throws IOExceptionInterface（进行连接的本地接口） ttl生存时间（连接在被抛弃前进行尝试的最大网络跳数） timeout允许时间列出本机上面所有网络接口的Java.util.EnumerationEnumeration ni=NetworkInterface.getNetworkInterfaces(); while(ni.hasMoreElements() NetworkInterface netIn=(NetworkInterface)ni.nextElement(); System.out.printl