[Java] Connection (Http) Class

[Bman]

 import java.io.*;
import java.net.*;
import java.util.*;
import java.util.zip.*;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
 
public class Connection implements Serializable {
   static final long serialVersionUID = 1L;
   
   String domain, referer;
   Map<String,String> cookies;
   
   static String rpUseragent = "Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.14) Gecko/20080509 Firefox/2.0.0.14";
   static String rpAcceptText = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
   static String rpAcceptPng = "image/png,image/*;q=0.8,*/*;q=0.5";
   static String rpAcceptLanguage = "en-us,en;q=0.5";
   static String rpAcceptEncoding = "gzip, deflate";
   static String rpAcceptCharset = "ISO-8859-1,utf-8;q=0.7,*;q=0.7";
   static String rpKeepAlive = "300";
   static String rpConnection = "keep-alive";
   static String rpContentType = "application/x-www-form-urlencoded";
   
   public Connection( String domain, Map<String,String> cookies, String referer ) {
      this.domain = domain;
      this.cookies = cookies;
      this.referer = referer;
   }
   
   public Connection( String domain, Map<String,String> cookies ) {
      this( domain, cookies, null );
   }
   
   public Connection( String domain, String referer ) {
      this( domain, new HashMap<String,String>(), referer );
   }
   
   public Connection( String domain ) {
      this( domain, new HashMap<String,String>(), null );
   }
   
   public String get( String url ) {
      if( url.charAt( 0 ) == '/' )
         url = domain + url;
      
      try {
         HttpURLConnection conn = (HttpURLConnection)( new URL( url.replaceAll( " ", "%20" ) ).openConnection() );
         setRequestProperties( conn );
         conn.setRequestMethod( "GET" );
         referer = url;
         return read( conn );
      } catch( IOException e1 ) {
         e1.printStackTrace();
         return null;
      }
   }
   
   public String post( String url, String[][] data ) {
      if( url.charAt( 0 ) == '/' )
         url = domain + url;
      
      try {
         HttpURLConnection conn = (HttpURLConnection)( new URL( url.replaceAll( " ", "%20" ) ).openConnection() );
         setRequestProperties( conn );
         conn.setRequestMethod( "POST" );
         conn.setDoOutput( true );
         
         StringBuilder sb = new StringBuilder();
         
         for( int i = 0; i < data[0].length; i++ )
            sb.append( URLEncoder.encode( data[0][i], "UTF-8" ) ).append( '=' ).append( URLEncoder.encode( data[1][i], "UTF-8" ) ).append( '&' );
         
         conn.setRequestProperty( "Content-Type", rpContentType );
         conn.setRequestProperty( "Content-Length", Integer.toString( sb.length()-1 ) );
         
         PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter( conn.getOutputStream() ) ) );
         out.write( sb.substring( 0, sb.length()-1 ) );
         out.close();
         
         referer = url;
         return read( conn );
      } catch( IOException e1 ) {
         e1.printStackTrace();
         return null;
      }
   }
   
   public BufferedImage getImage( String url ) {
      try {
         HttpURLConnection conn = (HttpURLConnection)( new URL( ( url.charAt( 0 ) == '/' ? domain+url : url ).replaceAll( " ", "%20" ) ).openConnection() );
         setRequestProperties( conn );
         conn.setRequestMethod( "GET" );
         conn.setRequestProperty( "Accept", rpAcceptPng );
         return ImageIO.read( conn.getInputStream() );
      } catch( IOException e1 ) {
         e1.printStackTrace();
         return null;
      }
   }
   
   public boolean hasCookie( String key ) {
      return cookies.containsKey( key );
   }
   
   public String getCookieString() {
      StringBuilder sb = new StringBuilder();
      
      for( String s : cookies.keySet() )
         sb.append( s ).append( '=' ).append( cookies.get( s ) ).append( ';' );
      
      return sb.toString();
   }
   
   private void setRequestProperties( HttpURLConnection conn ) {
      conn.setInstanceFollowRedirects( false );
      conn.setRequestProperty( "User-Agent", rpUseragent );
      conn.setRequestProperty( "Accept", rpAcceptText );
      conn.setRequestProperty( "Accept-Language", rpAcceptLanguage );
      conn.setRequestProperty( "Accept-Encoding", rpAcceptEncoding );
      conn.setRequestProperty( "Accept-Charset", rpAcceptCharset );
      conn.setRequestProperty( "Keep-Alive", rpKeepAlive );
      conn.setRequestProperty( "Connection", rpConnection );
      
      if( referer != null && referer.length() != 0 )
         conn.setRequestProperty( "Referer", referer );
      
      if( cookies != null && cookies.size() != 0 )
         conn.setRequestProperty( "Cookie", getCookieString() );
   }
   
   private String read( HttpURLConnection conn ) throws IOException {
      BufferedReader in = null;
      
      if( conn.getContentEncoding() == null )
         in = new BufferedReader( new InputStreamReader( conn.getInputStream() ) );
      else
         if( conn.getContentEncoding().equalsIgnoreCase( "gzip" ) )
            in = new BufferedReader( new InputStreamReader( new GZIPInputStream( conn.getInputStream() ) ) );
         else if( conn.getContentEncoding().equalsIgnoreCase( "deflate" ) )
            in = new BufferedReader( new InputStreamReader( new InflaterInputStream( conn.getInputStream(), new Inflater( true ) ) ) );
      
      StringBuilder sb = new StringBuilder();
      String s;
      
      while( ( s = in.readLine() ) != null )
         sb.append( s ).append( '\n' );
      
      putCookies( conn.getHeaderFields().get( "Set-Cookie" ) );
      return sb.toString();
   }
   
   private void putCookies( List<String> cookieList ) {
      if( cookieList == null )
         return;
      
      int index;
      
      for( String cookie : cookieList )
         cookies.put( cookie.substring( 0, index = cookie.indexOf( '=' ) ), cookie.substring( index+1, cookie.indexOf( ';', index ) ) );
   }
} 
  

Not written by me, I found it : Here