Connection Wrapper. - Java Code Bank

                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 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8";
   static String rpAcceptText = "ttext/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 void clearCookies(){
		cookies.clear();
   }
   
   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)));
   }
}



Usage:
Connection con = new Connection("http://www.hellboundhackers.org");

String page = con.get("/index.php");
page will be set to the text of index.php.

String page = con.post(urlhere, new String[][]{ {"name"}, {"value"} });

will post data..
EG:
con.post("/index.php", new String[][]{{"user_name", "user_pass", "login"},{username, password, "login"}});

where username and password are strings. (I use this code above to login to hbh for the timed challenges).