Java tutorial
/** * 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.navnorth.learningregistry; import com.navnorth.learningregistry.util.SelfSignSSLSocketFactory; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URI; import java.security.KeyStore; import java.util.ArrayList; import org.apache.commons.codec.binary.Base64; import org.apache.http.HttpResponse; import org.apache.http.HttpVersion; import org.apache.http.NameValuePair; 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.conn.ClientConnectionManager; 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.conn.ssl.SSLSocketFactory; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpParams; import org.apache.http.params.HttpProtocolParams; import org.apache.http.protocol.HTTP; import org.apache.http.util.EntityUtils; import org.apache.http.entity.StringEntity; import org.apache.http.message.BasicHeader; /** * Client for sending data to Learning Registry nodes * * @version 0.1.1 * @since 2011-12-06 * @author Todd Brown / Navigation North * <br> * Copyright 2011 Navigation North Learning Solutions LLC * <br> * Licensed under the Apache License, Version 2.0 (the "License"); See LICENSE * and README.md files distributed with this work for additional information * regarding copyright ownership. */ public class LRClient { // milliseconds public static final int HTTP_TIMEOUT = 30 * 1000; public static HttpClient getHttpClient(String scheme) { // TODO: this allows for self-signed certificates, which should just be an option, not used by default. if (scheme.equals("https")) { try { KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType()); trustStore.load(null, null); SSLSocketFactory sf = new SelfSignSSLSocketFactory(trustStore); sf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER); HttpParams params = new BasicHttpParams(); HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); HttpProtocolParams.setContentCharset(params, HTTP.UTF_8); SchemeRegistry registry = new SchemeRegistry(); registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80)); registry.register(new Scheme("https", sf, 443)); ClientConnectionManager ccm = new ThreadSafeClientConnManager(params, registry); return new DefaultHttpClient(ccm, params); } catch (Exception e) { return new DefaultHttpClient(); } } else { return new DefaultHttpClient(); } } public static String executeHttpPost(String url, ArrayList postParameters) throws Exception { BufferedReader in = null; try { URI uri = new URI(url); HttpClient client = getHttpClient(uri.getScheme()); HttpPost request = new HttpPost(uri); UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters); request.setEntity(formEntity); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while ((line = in.readLine()) != null) { sb.append(line + NL); } in.close(); String result = sb.toString(); return result; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } public static String executeHttpGet(String url) throws Exception { BufferedReader in = null; try { URI uri = new URI(url); HttpClient client = getHttpClient(uri.getScheme()); HttpGet request = new HttpGet(uri); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while ((line = in.readLine()) != null) { sb.append(line + NL); } in.close(); String result = sb.toString(); return result; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } public static String executeJsonGet(String url) throws Exception { BufferedReader in = null; try { URI uri = new URI(url); HttpClient client = getHttpClient(uri.getScheme()); HttpGet request = new HttpGet(uri); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while ((line = in.readLine()) != null) { sb.append(line + NL); } in.close(); String result = sb.toString(); return result; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } public static HttpResponse executeJsonPost(String url, StringEntity se, String username, String password) throws Exception { BufferedReader in = null; try { URI uri = new URI(url); HttpClient client = getHttpClient(uri.getScheme()); HttpPost post = new HttpPost(uri); post.setEntity(se); post.setHeader("Content-Type", "application/json"); if (username != null && password != null) { String userPass = username + ":" + password; byte[] encodedAuth = Base64.encodeBase64(userPass.getBytes()); String encodedAuthStr = new String(encodedAuth); post.addHeader("Authorization", "Basic " + encodedAuthStr); } HttpResponse response = client.execute(post); return response; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } }