Android Open Source - UK-Weather-repo Json Fetcher

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License

The source code is released under:

Apache License

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Java Source Code

package com.haringeymobile.ukweather.data;
//from   w  w  w  .  ja  v  a 2s . c o  m
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

/** Retrieves JSON data from URL. */
public class JsonFetcher {

  public static final int HTTP_STATUS_CODE_OK = 200;
  /** Maximum time to wait while connecting (in miliseconds). */
  public static final int TIMEOUT = 4500;
  public static final String GET = "GET";

  /**
   * Extracts JSON data from the provided web page as an {@link InputStream},
   * and converts the stream to a string.
   * 
   * @param url
   *            a web address for the JSON data
   * @return a string representing the JSON data, or null if there are
   *         connection problems
   * @throws IOException
   *             if there are connection problems
   */
  public String getJsonString(URL url) throws IOException {
    StringBuilder stringBuilder = null;
    InputStream inputStream = null;
    try {
      HttpURLConnection connection = getConnection(url);
      inputStream = connection.getInputStream();
      stringBuilder = readData(inputStream);
      connection.disconnect();
    } finally {
      if (inputStream != null) {
        inputStream.close();
      }
    }
    return stringBuilder.toString();
  }

  /**
   * Opens and sets the network connection.
   * 
   * @param url
   *            a web address for the JSON data
   * @return a connection pointing to a JSON data resource
   * @throws IOException
   *             if there are connection problems
   */
  private HttpURLConnection getConnection(URL url) throws IOException {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setReadTimeout(TIMEOUT);
    connection.setConnectTimeout(TIMEOUT * 2);
    connection.setRequestMethod(GET);
    connection.setDoInput(true);
    connection.connect();
    return connection;
  }

  /**
   * Fetches data from the provided input stream.
   * 
   * @param inputStream
   *            readable source of bytes
   * @return a set of characters representing the extracted data
   * @throws IOException
   *             in case of some stream reading problems
   */
  private StringBuilder readData(InputStream inputStream) throws IOException {
    BufferedReader bufferedReader = new BufferedReader(
        new InputStreamReader(inputStream));
    StringBuilder stringBuilder = new StringBuilder();
    String line;
    while ((line = bufferedReader.readLine()) != null) {
      stringBuilder.append(line + "\n");
    }
    return stringBuilder;
  }

}

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