url资料的复制

package udp;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;

public class url
{
	public static void main(String[] args) throws Exception
	{
		URL url1=new URL("file:/D:/1.txt");
		InputStream is=url1.openStream();
		DataInputStream dis=new DataInputStream(is);
		DataOutputStream dos=new DataOutputStream(new FileOutputStream("E:/1.txt"));
		int length=dis.read();
	
		while(length!=-1)
		{
			dos.write(length);
			
			length=dis.read();
		}
		dos.flush();
		if(dos!=null)
		{
			dos.close();
		}
		if(dis!=null)
		{
			dis.close();
		}
	}
}