midletcon.java

非富多彩的十六个J2ME的例子

import java.io.*;
import javax.microedition.io.*;
public class midletcon 
{
    public interface callback
    {
       public void preprequest(String originalURL,HttpConnection httpcon)
        throws IOException;
       
    
    }	
	public static HttpConnection con(String url) throws IOException
	{
	    return con(url,null);	
		
	}
	public static HttpConnection con(String url,Callback call) throws IOException
	{
	   HttpConnection httpcon=null;
	   
	   String originalURL=url;
	   
	   while(url!=null)
	   {
	   	httpcon=(HttpConnection)Connector.open(url);
	   	
	   	if(call!=null)
	   	{
	   	   call.prerequest(originalURL,httpcon);	
	   		
	   	}
	   	
	   	int rcode=httpcon.getResponseCode();
	   	switch(rcode)
	   	{
	   	   case HttpConnection.HTTP_MOVED_PERM:
	   	   case HttpConnection.HTTP_MOVED_TEMP:
	   	   case HttpConnection.HTTP_SEE_OTHER:
	   	   case HttpConnection.HTTP_TEMP_REDIRECT:
	   	   
	   	   url=httpcon.getHeaderField("Location");
	   	   if(url!=null && url.startsWith("/*"));
	   	   {
	   	   	    StringBuffer buff=new StringBuffer();
	   	   	    buff.append("/http://");
	   	   	    buff.append(httpcon.getHost());
	   	   	    buff.append(':');
	   	   	    buff.append(httpcon.getPort());
	   	   	    buff.append(url);
	   	   	    url=buff.toString();
	   	   	
	   	   	}
	   	   	
	   	   	httpcon.close();	
	   		break;
	   		default:
	   		url=null;
	   		break;
	   	}
	   	
	   	
	   }
	   return httpcon;	
	}
	
}