import java.io.*;
 import java.net.*;
 import java.util.*;

 public class WebCache {
 WeakHashMap cache = new WeakHashMap();

  public class WebObject {
    public String type;
    public byte[] content;
  }

  public WebObject get( String spec )
    throws MalformedURLException,IOException {
    URL url = new URL(spec);
   WebObjectobj = (WebObject)cache.get(url);
    if ( obj == null ) {
     URLConnectionconn = url.openConnection();
     obj = new WebObject();
     obj.type = conn.getContentType();
     obj.content = new byte[conn.getContentLength()];
     conn.getInputStream().read( obj.content );
     cache.put( url, obj );
    }
    return obj;
  }
 }