Java tutorial
/** * Copyright 2014 Netflix, Inc. * * 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 org.elasticsearch.discovery.custom; import org.elasticsearch.common.logging.ESLogger; import org.apache.commons.lang.CharEncoding; import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import java.io.FilterInputStream; import java.net.HttpURLConnection; import java.net.URL; public class DataFetcher { public static String fetchData(String url, ESLogger logger) { DataInputStream responseStream = null; try { HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection(); conn.setConnectTimeout(1000); conn.setReadTimeout(10000); conn.setRequestMethod("GET"); if (conn.getResponseCode() != 200) throw new RuntimeException("Unable to get data for URL " + url); byte[] b = new byte[2048]; ByteArrayOutputStream bos = new ByteArrayOutputStream(); responseStream = new DataInputStream((FilterInputStream) conn.getContent()); int c = 0; while ((c = responseStream.read(b, 0, b.length)) != -1) bos.write(b, 0, c); String return_ = new String(bos.toByteArray(), CharEncoding.UTF_8); logger.info(String.format("Calling URL API: %s returns: %s", url, return_)); conn.disconnect(); return return_; } catch (Exception ex) { throw new RuntimeException(ex); } finally { try { if (responseStream != null) responseStream.close(); } catch (Exception e) { logger.warn("Failed to close response stream from priam", e); } } } }