myhttpconnection.java

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import java.io.*;
import javax.microedition.io.*;
public class MyHttpConnection
{
	//定义连接服务器的接口
	public interface Callback 
	{
		void prep_Request( String originalURL, HttpConnection http_Con) throws IOException;
	}
	public static HttpConnection connect( String url ) throws IOException 
	{
		return connect( url, null );
	}
	//定义连接服务器的静态方法
	public static HttpConnection connect(String url, Callback call ) throws IOException 
	{
		HttpConnection http_Con = null;
		String original_URL = url;
		while( url != null )
		{
			//建立并打开连接
			http_Con = (HttpConnection)Connector.open( url );
			if( call != null )
			{
				call.prep_Request( original_URL, http_Con );
			}
			//获得连接响应代码
			int rcode = http_Con.getResponseCode();
			//根据返回的连接响应代码，得到请求的具体路径
			switch( rcode )
			{
				case HttpConnection.HTTP_MOVED_PERM:
				case HttpConnection.HTTP_MOVED_TEMP:
				case HttpConnection.HTTP_SEE_OTHER:
				case HttpConnection.HTTP_TEMP_REDIRECT:
				url = http_Con.getHeaderField( "Location" );
				if( url != null && url.startsWith("/*") )
				{
					StringBuffer buff = new StringBuffer();
					buff.append( "http://" );
					buff.append( http_Con.getHost() );
					buff.append( ':' );
					buff.append( http_Con.getPort() );
					buff.append( url );
					url = buff.toString();
				}
				http_Con.close();
				break;
				default:
				url = null;
				break;
			}
		}
		return http_Con;
	}
}