Android Open Source - tribunaldroid Connection Manager

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License

The source code is released under:

GNU General Public License

Java Source Code

package hu.nxu.tribunaldroid.networkComm;
/* w  ww  .j  av a2 s  .  c o  m*/
import java.net.*;
import java.io.*;

public class ConnectionManager {
  private static final ConnectionManager _singleton = new ConnectionManager();
  
  private CookieCollection cookies;
  
  /**
   * Initializes the only instance of the ConnectionManager class.
   */
  private ConnectionManager()
  {
    this.cookies = new CookieCollection();
  }
  
  /**
   * Gets the instance of the singleton ConnectionManager class.
   * @return The instance of the ConnnectionManager class.
   */
  public static ConnectionManager getInstance()
  {
    return _singleton;
  }
  
  /**
   * Performs a HTTP(S) GET request.
   * @param uri  The URI to connect to.
   * @return    The response body as a byte array.
   * @throws Exception
   */
  public byte[] get(String uri) throws Exception
  {
    // Connect
    URL myUrl = new URL(uri);
    HttpURLConnection urlConn = (HttpURLConnection)myUrl.openConnection();
    
    // Set cookies and method
    urlConn.setRequestProperty("Cookie", this.cookies.toString());
    urlConn.setRequestMethod("GET");
    
    try
    {
      urlConn.connect();
    }
    catch (Exception c)
    {
      throw new Exception("01");
    }
    
    // Set the cookies
    this.setCookies(urlConn);
    
    // Read response
    return this.readResponseBody(urlConn);
  }
  
  /**
   * Performs a HTTP(S) POST request.
   * @param uri    The URI to connect to.
   * @param postData  The post data.
   * @return      The response body as byte array.
   * @throws Exception
   */
  public byte[] post(String uri, String postData) throws Exception
  {
    // Connect
    URL myUrl = new URL(uri);
    HttpURLConnection urlConn = (HttpURLConnection)myUrl.openConnection();
    
    // Set properties and method
    urlConn.setRequestMethod("POST");
    urlConn.setRequestProperty("Cookie", this.cookies.toString());
    urlConn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:25.0) Gecko/20100101 Firefox/25.0");
    urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    urlConn.setRequestProperty("Content-Length", Integer.toString(postData.length()));
    urlConn.setRequestProperty("Accept-Charset", "UTF-8");
    
    urlConn.setDoInput(true);
    urlConn.setDoOutput(true);
    
    try
    {
      OutputStream output = urlConn.getOutputStream();
      try {
           output.write(postData.getBytes("UTF-8"));
      } finally {
           try { 
             output.close(); 
           } 
           catch (IOException ex) {
             throw new Exception("02"); 
           }
      }

    }
    catch (Exception c)
    {
      throw new Exception("01");
    }
    
    // Set the cookies
    this.setCookies(urlConn);
    
    // Read response
    return this.readResponseBody(urlConn);
  }
  
  /**
   * Reads the body of a HTTP(S) response.
   * @param urlConn  The opened connection.
   * @throws Exception 
   */
  private byte[] readResponseBody(URLConnection urlConn) throws Exception
  {
    ByteArrayOutputStream output = new ByteArrayOutputStream();
    byte[] buffer = new byte[512];
    BufferedInputStream input = new BufferedInputStream(urlConn.getInputStream());
    
    try
    {
      while (input.read(buffer) > -1) {
        output.write(buffer);
      }
    }
    catch (Exception ex)
    {
      throw new Exception("02");
    }
    
    // Flush output stream and return
    output.flush();
    return output.toByteArray();
  }
  
  /**
   * Reads the cookies from a HTTP(S) response and updates the cookie list.
   * @param urlConn The opened URL Connected, the response must be available.
   * 
   */
  private void setCookies(URLConnection urlConn)
  {
    String headerName = null;
    for (int i=1; (headerName = urlConn.getHeaderFieldKey(i))!=null; i++) {
       if (headerName.equals("Set-Cookie")) {                  
        String cookie = urlConn.getHeaderField(i);               
            cookie = cookie.substring(0, cookie.indexOf(";"));
            String cookieName = cookie.substring(0, cookie.indexOf("="));
            String cookieValue = cookie.substring(cookie.indexOf("=") + 1, cookie.length());
            
            this.cookies.setCookie(new Cookie(cookieName, cookieValue));
       }
    }
  }
}

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