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();
        }