一起学习
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);
}
}
}
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