Java tutorial
/* * Copyright 2013 Walter Hugo Palladino * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.whp.android.rest; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.URLEncoder; import java.util.ArrayList; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; 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.client.methods.HttpUriRequest; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import org.apache.http.protocol.HTTP; /** * @author Walter Hugo Palladino * Inspired and modified from stackoverflow http://stackoverflow.com/questions/13005101/how-to-send-json-data-to-post-restful-service * @since 21/03/2014 * */ /* * RestClient client=new RestClient(Webservices.student_details); JSONObject obj=new JSONObject(); obj.put("StudentId",preferences.getStudentId()); client.AddParam("",obj.toString()); client.Execute(RequestMethod.GET); String response=client.getResponse(); */ public class RestClient { private static final int CONNECTION_TIMEOUT = 15000; private ArrayList<NameValuePair> params; private ArrayList<NameValuePair> headers; private String url; private int responseCode; private String message; private String response; public String getResponse() { return response; } public String getErrorMessage() { return message; } public int getResponseCode() { return responseCode; } public RestClient(String url) { this.url = url; params = new ArrayList<NameValuePair>(); headers = new ArrayList<NameValuePair>(); } public void addParam(String name, String value) { params.add(new BasicNameValuePair(name, value)); } public void addHeader(String name, String value) { headers.add(new BasicNameValuePair(name, value)); } /** * Execute * @param method * @throws Exception */ public void execute(RequestMethod method) throws Exception { switch (method) { case GET: { // add parameters String combinedParams = ""; if (!params.isEmpty()) { combinedParams += ""; for (NameValuePair p : params) { String paramString = p.getName() + "" + URLEncoder.encode(p.getValue(), "UTF-8"); if (combinedParams.length() > 1) { combinedParams += "&" + paramString; } else { combinedParams += paramString; } } } HttpGet request = new HttpGet(url + combinedParams); // add headers for (NameValuePair h : headers) { request.addHeader(h.getName(), h.getValue()); } executeRequest(request, url); break; } case POST: { HttpPost request = new HttpPost(url); // add headers for (NameValuePair h : headers) { request.addHeader(h.getName(), h.getValue()); } if (!params.isEmpty()) { request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); } executeRequest(request, url); break; } } } /** * executeRequest * @param request * @param url * @throws Exception */ private void executeRequest(HttpUriRequest request, String url) throws Exception { HttpParams httpParameters = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParameters, CONNECTION_TIMEOUT); HttpConnectionParams.setSoTimeout(httpParameters, CONNECTION_TIMEOUT); HttpClient client = new DefaultHttpClient(httpParameters); HttpResponse httpResponse; httpResponse = client.execute(request); responseCode = httpResponse.getStatusLine().getStatusCode(); message = httpResponse.getStatusLine().getReasonPhrase(); HttpEntity entity = httpResponse.getEntity(); if (entity != null) { InputStream instream = entity.getContent(); response = convertStreamToString(instream); // Closing the input stream will trigger connection release instream.close(); } } /** * convertStreamToString * @param is * @return */ private static String convertStreamToString(InputStream is) { 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(); } /** * getInputStream * @return */ public InputStream getInputStream() { HttpParams httpParameters = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParameters, CONNECTION_TIMEOUT); HttpConnectionParams.setSoTimeout(httpParameters, CONNECTION_TIMEOUT); HttpClient client = new DefaultHttpClient(httpParameters); HttpResponse httpResponse; try { HttpPost request = new HttpPost(url); httpResponse = client.execute(request); responseCode = httpResponse.getStatusLine().getStatusCode(); message = httpResponse.getStatusLine().getReasonPhrase(); HttpEntity entity = httpResponse.getEntity(); if (entity != null) { InputStream instream = entity.getContent(); return instream; /* * response = convertStreamToString(instream); * * // Closing the input stream will trigger connection release * instream.close(); */ } } catch (ClientProtocolException e) { client.getConnectionManager().shutdown(); e.printStackTrace(); } catch (IOException e) { client.getConnectionManager().shutdown(); e.printStackTrace(); } return null; } /** * @author Walter Hugo Palladino * @since 21/03/2014 * */ public enum RequestMethod { GET, POST } }