Java tutorial
/* * This file is part of ForsakenSuite. * * Copyright 2012-2014, * ForsakenNetwork LLC * <http://www.forsaken.co/> * ForsakenSuite is licensed under the Forsaken Network License Version 1 * * ForsakenSuite is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * In addition, 180 days after any changes are published, you can use the * software, incorporating those changes, under the terms of the MIT license, * as described in the Forsaken Network License Version 1. * * ForsakenSuite 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License, * the MIT license and the Forsaken Network License Version 1 along with this program. * If not, see <http://www.gnu.org/licenses/> for the GNU Lesser General Public * License. */ package co.forsaken.api.json; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.conn.scheme.PlainSocketFactory; import org.apache.http.conn.scheme.Scheme; import org.apache.http.conn.scheme.SchemeRegistry; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.conn.PoolingClientConnectionManager; import org.apache.http.message.BasicHeader; import co.forsaken.projectindigo.utils.Callback; import com.google.gson.Gson; public class JsonWebCall { private String _url; private PoolingClientConnectionManager _connectionManager; private boolean _log = false; public JsonWebCall(String url) { _url = url; SchemeRegistry schemeRegistry = new SchemeRegistry(); schemeRegistry.register(new Scheme("http", 80, PlainSocketFactory.getSocketFactory())); _connectionManager = new PoolingClientConnectionManager(schemeRegistry); _connectionManager.setMaxTotal(200); _connectionManager.setDefaultMaxPerRoute(20); } public String executeRet(Object arg) { if (_log) System.out.println("Requested: [" + _url + "]"); try { canConnect(); } catch (Exception ex) { ex.printStackTrace(); return null; } HttpClient httpClient = new DefaultHttpClient(_connectionManager); InputStream in = null; String res = null; try { Gson gson = new Gson(); HttpPost request = new HttpPost(_url); if (arg != null) { StringEntity params = new StringEntity(gson.toJson(arg)); params.setContentType(new BasicHeader("Content-Type", "application/json")); request.setEntity(params); } HttpResponse response = httpClient.execute(request); if (response != null) { in = response.getEntity().getContent(); res = convertStreamToString(in); } } catch (Exception ex) { System.out.println("JSONWebCall.execute() Error: \n" + ex.getMessage()); System.out.println("Result: \n" + res); StackTraceElement[] arrOfSTE; int max = (arrOfSTE = ex.getStackTrace()).length; for (int i = 0; i < max; i++) { StackTraceElement trace = arrOfSTE[i]; System.out.println(trace); } } finally { httpClient.getConnectionManager().shutdown(); if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } if (_log) System.out.println("Returned: [" + _url + "] [" + res + "]"); return res; } public String executeGet() { if (_log) System.out.println("Requested: [" + _url + "]"); try { canConnect(); } catch (Exception ex) { ex.printStackTrace(); return null; } HttpClient httpClient = new DefaultHttpClient(_connectionManager); InputStream in = null; String res = null; try { HttpGet request = new HttpGet(_url); request.setHeader("Content-Type", "application/json"); HttpResponse response = httpClient.execute(request); if (response != null) { in = response.getEntity().getContent(); res = convertStreamToString(in); } } catch (Exception ex) { System.out.println("JSONWebCall.execute() Error: \n" + ex.getMessage()); System.out.println("Result: \n" + res); StackTraceElement[] arrOfSTE; int max = (arrOfSTE = ex.getStackTrace()).length; for (int i = 0; i < max; i++) { StackTraceElement trace = arrOfSTE[i]; System.out.println(trace); } } finally { httpClient.getConnectionManager().shutdown(); if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } if (_log) System.out.println("Returned: [" + _url + "] [" + res + "]"); return res; } public void execute(Object arg) { if (_log) System.out.println("Requested: [" + _url + "]"); try { canConnect(); } catch (Exception ex) { ex.printStackTrace(); return; } HttpClient httpClient = new DefaultHttpClient(_connectionManager); try { Gson gson = new Gson(); HttpPost request = new HttpPost(_url); if (arg != null) { StringEntity params = new StringEntity(gson.toJson(arg)); params.setContentType(new BasicHeader("Content-Type", "application/json")); request.setEntity(params); } httpClient.execute(request); } catch (Exception ex) { System.out.println("JSONWebCall.executeNoRet() Error: \n" + ex.getMessage()); StackTraceElement[] arrOfSTE; int max = (arrOfSTE = ex.getStackTrace()).length; for (int i = 0; i < max; i++) { StackTraceElement trace = arrOfSTE[i]; System.out.println(trace); } } finally { httpClient.getConnectionManager().shutdown(); } if (_log) System.out.println("Returned: [" + _url + "]"); } public <T> T execute(Class<T> retType, Object arg) { if (_log) System.out.println("Requested: [" + _url + "]"); try { canConnect(); } catch (Exception ex) { ex.printStackTrace(); return null; } HttpClient httpClient = new DefaultHttpClient(_connectionManager); InputStream in = null; T returnData = null; String res = null; try { Gson gson = new Gson(); HttpPost request = new HttpPost(_url); if (arg != null) { StringEntity params = new StringEntity(gson.toJson(arg)); params.setContentType(new BasicHeader("Content-Type", "application/json")); request.setEntity(params); } HttpResponse response = httpClient.execute(request); if (response != null) { in = response.getEntity().getContent(); res = convertStreamToString(in); returnData = new Gson().fromJson(res, retType); } } catch (Exception ex) { System.out.println("JSONWebCall.execute() Error: \n" + ex.getMessage()); System.out.println("Result: \n" + res); StackTraceElement[] arrOfSTE; int max = (arrOfSTE = ex.getStackTrace()).length; for (int i = 0; i < max; i++) { StackTraceElement trace = arrOfSTE[i]; System.out.println(trace); } } finally { httpClient.getConnectionManager().shutdown(); if (in != null) { try { in.close(); } catch (IOException ex) { ex.printStackTrace(); } } } if (_log) System.out.println("Returned: [" + _url + "] [" + res + "]"); return returnData; } private boolean canConnect() throws Exception { try { HttpURLConnection.setFollowRedirects(false); HttpURLConnection con = (HttpURLConnection) new URL(_url).openConnection(); con.setRequestMethod("HEAD"); con.setConnectTimeout(2000); if (con.getResponseCode() != HttpURLConnection.HTTP_OK) { throw new Exception("Service " + _url + " unavailable, oh no!"); } return true; } catch (java.net.SocketTimeoutException e) { throw new Exception("Service " + _url + " unavailable, oh no!", e); } catch (java.io.IOException e) { throw new Exception("Service " + _url + " unavailable, oh no!", e); } } public <T> T executeGet(Class<T> retType, boolean encapsulate) throws Exception { if (_log) System.out.println("Requested: [" + _url + "]"); try { canConnect(); } catch (Exception ex) { ex.printStackTrace(); return null; } HttpClient httpClient = new DefaultHttpClient(_connectionManager); InputStream in = null; T returnData = null; String res = null; try { HttpGet request = new HttpGet(_url); request.setHeader("Content-Type", "application/json"); HttpResponse response = httpClient.execute(request); if (response != null) { in = response.getEntity().getContent(); res = convertStreamToString(in); if (encapsulate) { res = "{\"data\":" + res + "}"; } returnData = new Gson().fromJson(res, retType); } } catch (Exception ex) { throw ex; } finally { httpClient.getConnectionManager().shutdown(); if (in != null) { try { in.close(); } catch (IOException ex) { ex.printStackTrace(); } } } if (_log) System.out.println("Returned: [" + _url + "] [" + res + "]"); return returnData; } public <T> void execute(Class<T> callbackClass, Callback<T> callback) { execute(callbackClass, callback, null); } public <T> void execute(Class<T> callbackClass, Callback<T> callback, Object arg) { if (_log) System.out.println("Requested: [" + _url + "]"); try { canConnect(); } catch (Exception ex) { ex.printStackTrace(); return; } HttpClient httpClient = new DefaultHttpClient(_connectionManager); InputStream in = null; String res = null; try { Gson gson = new Gson(); HttpPost request = new HttpPost(_url); if (arg != null) { StringEntity params = new StringEntity(gson.toJson(arg)); params.setContentType(new BasicHeader("Content-Type", "application/json")); request.setEntity(params); } HttpResponse response = httpClient.execute(request); if (response != null) { in = response.getEntity().getContent(); res = convertStreamToString(in); if (_log) System.out.println("Returned: [" + _url + "] [" + res + "]"); callback.run(new Gson().fromJson(res, callbackClass)); } } catch (Exception ex) { ex.printStackTrace(); System.out.println("JSONWebCall.execute() Error: \n" + ex.getMessage()); System.out.println("Result: \n" + res); StackTraceElement[] arrOfSTE; int max = (arrOfSTE = ex.getStackTrace()).length; for (int i = 0; i < max; i++) { StackTraceElement trace = arrOfSTE[i]; System.out.println(trace); } } finally { httpClient.getConnectionManager().shutdown(); if (in != null) { try { in.close(); } catch (IOException ex) { ex.printStackTrace(); } } } } protected 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(); } }