Java URL编程

<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> Example 1 Below is a simple Java program which can get the hostname of a computer from IP address. download now Tips 1. Compile: javac GetHost 2. Run: java GetHost 111.111.111.1(your IP or others)

import java.io.*; import java.net.*; // // // GetHost.java // // public class GetHost { public static void main (String arg[]){ if (arg.length>=1){ InetAddress[] Inet; int i=1; try{ for (i=1;i<=arg.length;i ){ Inet = InetAddress.getAllByName(arg[i-1]); for (int j=1;j<=Inet.length;j ){ System.out.print(Inet[j-1].toString()); System.out.print("/n"); } } } catch(UnknownHostException e){ System.out.print("Unknown HostName!" arg[i-1]); } } else{ System.out.print("Usage java/jview GetIp "); } } } Example 2 download now //GetHTML.java /** * This is a program which can read information from a web server. * @version 1.0 2000/01/01 * @author jdeveloper **/ import java.net.*; import java.io.*; public class GetHTML { public static void main(String args[]){ if (args.length < 1){ System.out.println("USAGE: java GetHTML httpaddress"); System.exit(1); } String sURLAddress = new String(args[0]); URL url = null; try{ url = new URL(sURLAddress); }catch(MalformedURLException e){ System.err.println(e.toString()); System.exit(1); } try{ InputStream ins = url.openStream(); BufferedReader breader = new BufferedReader(new InputStreamReader(ins)); String info = breader.readLine(); while(info != null){ System.out.println(info); info = breader.readLine(); } } catch(IOException e){ System.err.println(e.toString()); System.exit(1); } } }