Android Open Source - SmartNavi Http Connection

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License

The source code is released under:

Apache License

Java Source Code

package org.osmdroid.bonuspack.utils;
/*from   w w w  .ja  va2s . c om*/
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;
import android.util.Log;

/**
 * A "very very simple to use" class for performing http get and post requests. 
 * So many ways to do that, and potential subtle issues. 
 * If complexity should be added to handle even more issues, complexity should be put here and only here. 
 * 
 * Typical usage: 
 * <pre>HttpConnection connection = new HttpConnection();
 * connection.doGet("http://www.google.com");
 * InputStream stream = connection.getStream();
 * if (stream != null) {
 *   //use this stream, for buffer reading, or XML SAX parsing, or whatever... 
 * }
 * connection.close();</pre>
 */
public class HttpConnection {

  private DefaultHttpClient client;
  private InputStream stream;
  private HttpEntity entity;
  private String mUserAgent;
  
  private final static int TIMEOUT_CONNECTION=3000; //ms 
  private final static int TIMEOUT_SOCKET=8000; //ms
  
  public HttpConnection(){
    stream = null;
    entity = null;
    HttpParams httpParameters = new BasicHttpParams();
    /* useful?
    HttpProtocolParams.setContentCharset(httpParameters, "UTF-8"); 
    HttpProtocolParams.setHttpElementCharset(httpParameters, "UTF-8");
    */
    // Set the timeout in milliseconds until a connection is established.
    HttpConnectionParams.setConnectionTimeout(httpParameters, TIMEOUT_CONNECTION);
    // Set the default socket timeout (SO_TIMEOUT) 
    // in milliseconds which is the timeout for waiting for data.
    HttpConnectionParams.setSoTimeout(httpParameters, TIMEOUT_SOCKET);
    client = new DefaultHttpClient(httpParameters); 
      //TODO: created here. Reuse to do for better perfs???...
  }
  
  public void setUserAgent(String userAgent){
    mUserAgent = userAgent;
  }
  
  /**
   * @param sUrl url to get
   */
  public void doGet(String sUrl){
    try {
      HttpGet request = new HttpGet(sUrl);
      if (mUserAgent != null)
        request.setHeader("User-Agent", mUserAgent);
      HttpResponse response = client.execute(request);
      StatusLine status = response.getStatusLine();
      if (status.getStatusCode() != 200) {
        Log.e(BonusPackHelper.LOG_TAG, "Invalid response from server: " + status.toString());
      } else {
        entity = response.getEntity();
      }
    } catch (Exception e){
      e.printStackTrace();
    }
  }
  
  public void doPost(String sUrl, List<NameValuePair> nameValuePairs) {
    try {
      HttpPost request = new HttpPost(sUrl);
      if (mUserAgent != null)
        request.setHeader("User-Agent", mUserAgent);
      request.setEntity(new UrlEncodedFormEntity(nameValuePairs));
      HttpResponse response = client.execute(request);
      StatusLine status = response.getStatusLine();
      if (status.getStatusCode() != 200) {
        Log.e(BonusPackHelper.LOG_TAG, "Invalid response from server: " + status.toString());
      } else {
        entity = response.getEntity();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  
  /** 
   * @return the opened InputStream, or null if creation failed for any reason. 
   */
  public InputStream getStream() {
    try {
      if (entity != null)
        stream = entity.getContent();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return stream;
  }
  
  /**
   * @return the whole content as a String, or null if creation failed for any reason. 
   */
  public String getContentAsString(){
    try {
      if (entity != null) {
        return EntityUtils.toString(entity, "UTF-8");
          //setting the charset is important if none found in the entity. 
      } else 
        return null;
    } catch (IOException e) {
      e.printStackTrace();
      return null;
    }
  }
  
  /**
   * Calling close once is mandatory. 
   */
  public void close(){
    if (stream != null){
      try { 
        stream.close();
        stream = null;
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    if (entity != null){
      try {
        entity.consumeContent(); 
          //"finish". Important if we want to reuse the client object one day... 
        entity = null;
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    if (client != null){
      client.getConnectionManager().shutdown();
      client = null;
    }
  }
  
}

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