java源码：url编程.txt

学习(编程技巧_编程知识_程序代码),是学习编程不可多得的学习精验

Java源码：URL编程
 

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第八军团 时间：2004-1-23 15:45:52 
   
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); 
} 
} 
}