NetUtil


1   // Copyright (c) 2003-2007, Jodd Team (jodd.sf.net). All Rights Reserved.
2   
3   package jodd.util;
4   
5   import jodd.io.StreamUtil;
6   
7   import java.io.IOException  ;
8   import java.net.HttpURLConnection  ;
9   import java.net.Inet4Address  ;
10  import java.net.InetAddress  ;
11  import java.net.URL  ;
12  import java.net.UnknownHostException  ;
13  
14  /**
15   * Network utilities.
16   */
17  public class NetUtil {
18  
19      /**
20       * Resolves hostname and returns ip address as a string.
21       */
22      public static String   resolveHost(String   hostname) {
23          try {
24              InetAddress   addr = Inet4Address.getByName(hostname);
25              byte[] ipAddr = addr.getAddress();
26              StringBuffer   ipAddrStr = new StringBuffer  (15);
27              for (int i = 0; i < ipAddr.length; i++) {
28                  if (i > 0) {
29                      ipAddrStr.append('.');
30                  }
31                  ipAddrStr.append(ipAddr[i] & 0xFF);
32              }
33              return ipAddrStr.toString();
34          } catch (UnknownHostException   uhex) {
35              return null;
36          }
37      }
38  
39      /**
40       * Resolves string ip address and returns host name as a string.
41       */
42      public static String   resolveIp(String   ip) {
43          try {
44              InetAddress   addr = InetAddress.getByName(ip);
45              return addr.getHostName();
46          } catch (UnknownHostException   uhex) {
47              return null;
48          }
49      }
50  
51      /**
52       * Resolves ip address and returns host name as a string.
53       */
54      public static String   resolveIp(byte[] ip) {
55          try {
56              InetAddress   addr = InetAddress.getByAddress(ip);
57              return addr.getHostName();
58          } catch (UnknownHostException   uhex) {
59              return null;
60          }
61      }
62  
63      // ---------------------------------------------------------------- download
64      
65      /**
66       * Download resource from URL.
67       */
68      public static byte[] download(String   url) throws IOException   {
69          HttpURLConnection   conection = (HttpURLConnection  )((new URL  (url).openConnection()));
70          return StreamUtil.readBytes(conection.getInputStream());
71      }
72  }
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