Java tutorial
package org.bimserver.utils; /****************************************************************************** * Copyright (C) 2009-2016 BIMserver.org * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see {@literal<http://www.gnu.org/licenses/>}. *****************************************************************************/ import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import org.apache.commons.io.IOUtils; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.ByteArrayEntity; import org.apache.http.entity.ContentType; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ObjectNode; import com.google.common.base.Charsets; public class NetUtils { private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper(); public static String getContent(URL url, int timeOut) throws IOException { URLConnection openConnection = url.openConnection(); openConnection.setConnectTimeout(timeOut); openConnection.setReadTimeout(timeOut); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); InputStream in = openConnection.getInputStream(); IOUtils.copy(in, byteArrayOutputStream); in.close(); return new String(byteArrayOutputStream.toByteArray(), Charsets.UTF_8); } public static byte[] getContentAsBytes(URL url, int timeOut) throws IOException { URLConnection openConnection = url.openConnection(); openConnection.setConnectTimeout(timeOut); openConnection.setReadTimeout(timeOut); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); InputStream in = openConnection.getInputStream(); IOUtils.copy(in, byteArrayOutputStream); in.close(); return byteArrayOutputStream.toByteArray(); } public static void main(String[] args) { try { String content = getContent(new URL("https://berlotti.github.io/Elasstic/services.json"), 5000); System.out.println(content); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static ObjectNode post(String url, ObjectNode objectNode) throws IOException { CloseableHttpClient httpclient = HttpClients.createDefault(); try { ByteArrayOutputStream out = new ByteArrayOutputStream(); OBJECT_MAPPER.writeValue(out, objectNode); HttpPost post = new HttpPost(url); post.setEntity(new ByteArrayEntity(out.toByteArray(), ContentType.APPLICATION_JSON)); CloseableHttpResponse httpResponse = httpclient.execute(post); ObjectNode response = OBJECT_MAPPER.readValue(httpResponse.getEntity().getContent(), ObjectNode.class); return response; } finally { httpclient.close(); } } }