useurl.java

接着上次传入一些Java学习中的实验

import java.io.*;
import java.net.URL;
import java.util.*;
public class UseUrl{
		public static void main(String args[]){
				
		InputStream is=null;
		try{
				
				Properties p=System.getProperties();//系统属性
				Enumeration k=p.keys();
				Enumeration r=p.elements();
				String userName=(String)p.get("userName");
				while(k.hasMoreElements()){
						System.out.println(k.nextElement()+" :"+r.nextElement());
		    							   }
			
			
			
			URL url=new URL("http://mail.163.com/");
	 		is=url.openStream();
			byte buffer[]=new byte[2048];
			is.read(buffer,0,buffer.length);
			System.out.println(new String(buffer));
			try{
				FileOutputStream fileout=new FileOutputStream("D:\\javaprogram\\out.txt");
				fileout.write(buffer);
				fileout.close();
			
			  }catch(FileNotFoundException e){System.out.println(" ");}
		//	InputStreamReader reader=new InputStreamReader();
		//	char c[]=(char)reader.read();
		//	System.out.println(c);
		//	FileOutputStream fileout=new FileOutputStrea,("D:\\javaprogram\\out.txt",true);
					
			}catch(IOException e){System.out.println("the internet is not suitable for use URL or you address is incorect!");}	
			}	
}