InetAddress获取本地计算机IP地址

有时需要获取本机的ip地址，简单的记录一下：

     //获取单个IP地址     public static String getLocalHostIP() {           String ip;           try {                InetAddress addr = InetAddress.getLocalHost();                ip = addr.getHostAddress();            } catch(Exception ex) {               ip = "";           }           return ip;      }      //获取主机名称     public static String getLocalHostName() {           String hostName;           try {                InetAddress addr = InetAddress.getLocalHost();                hostName = addr.getHostName();           }catch(Exception ex){               hostName = "";           }           return hostName;      }      //获取所有的IP地址     public static String[] getAllLocalHostIP() {          String[] ret = null;           try {                String hostName = getLocalHostName();                if(hostName.length()>0) {                     InetAddress[] addrs = InetAddress.getAllByName(hostName);                     if(addrs.length>0) {                          ret = new String[addrs.length];                          for(int i=0 ; i< addrs.length ; i++) {                              ret[i] = addrs[i].getHostAddress();                          }                     }                }           }catch(Exception ex) {               ret = null;           }           return ret;      } 

同时有时候需要获取某个网站的IP，可以使用以下代码：

        InetAddress baidu;        try {            baidu = InetAddress.getByName("www.baidu.com");            System.out.println("baidu : " + baidu);            System.out.println("baidu IP: " + baidu.getHostAddress());            System.out.println("baidu HostName: " + baidu.getHostName());        } catch (UnknownHostException e) {            e.printStackTrace();        }

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