es.ugr.swad.swadroid.webservices.RestEasy.java Source code

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Here is the source code for es.ugr.swad.swadroid.webservices.RestEasy.java

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/*
 *  This file is part of SWADroid.
 *
 *  Copyright (C) 2010 Juan Miguel Boyero Corral <juanmi1982@gmail.com>
 *
 *  SWADroid is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  SWADroid is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with SWADroid.  If not, see <http://www.gnu.org/licenses/>.
 */
package es.ugr.swad.swadroid.webservices;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * 
 * @author Majid Khosravi
 */
public class RestEasy {

    // Post JSON to the resteasy web service
    public static HttpResponse doPost(String url, JSONObject c) throws ClientProtocolException, IOException {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost request = new HttpPost(url);
        StringEntity s = new StringEntity(c.toString());
        s.setContentEncoding("UTF-8");
        s.setContentType("application/json");

        request.setEntity(s);
        request.addHeader("accept", "application/json");

        return httpclient.execute(request);
    }

    // Put JSON to the resteasy web services
    public static HttpResponse doPut(String url, JSONObject c) throws ClientProtocolException, IOException {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPut request = new HttpPut(url);
        StringEntity s = new StringEntity(c.toString());
        s.setContentEncoding("UTF-8");
        s.setContentType("application/json");

        request.setEntity(s);
        request.addHeader("accept", "application/json");

        return httpclient.execute(request);

    }

    // Delete a resource in the resteasy web services
    public static void doDelete(String url) throws ClientProtocolException, IOException {
        HttpClient httpclient = new DefaultHttpClient();
        HttpDelete delete = new HttpDelete(url);
        delete.addHeader("accept", "application/json");
        httpclient.execute(delete);
    }

    // Retrieve a resource from the resteasy web service
    public static JSONObject doGet(String url) throws ClientProtocolException, IOException, JSONException {
        JSONObject json = null;

        HttpClient httpclient = new DefaultHttpClient();

        // Prepare a request object
        HttpGet httpget = new HttpGet(url);

        // Accept JSON
        httpget.addHeader("accept", "application/json");

        // Execute the request
        HttpResponse response = httpclient.execute(httpget);

        // Get the response entity
        HttpEntity entity = response.getEntity();

        // If response entity is not null 
        if (entity != null) {

            // get entity contents and convert it to string
            InputStream instream = entity.getContent();
            String result = convertStreamToString(instream);

            // construct a JSON object with result
            json = new JSONObject(result);

            // Closing the input stream will trigger connection release
            instream.close();
        }

        // Return the json
        return json;
    }

    // Convert Inputstream to string
    public static String convertStreamToString(InputStream is) {
        /*
         * To convert the InputStream to String we use the BufferedReader.readLine()
         * method. We iterate until the BufferedReader return null which means
         * there's no more data to read. Each line will appended to a StringBuilder
         * and returned as String.
         */
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

}