| /* |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.hc.client5.http.examples.fluent; |
| |
| import java.io.IOException; |
| import java.nio.charset.Charset; |
| import java.nio.charset.StandardCharsets; |
| |
| import javax.xml.parsers.DocumentBuilder; |
| import javax.xml.parsers.DocumentBuilderFactory; |
| import javax.xml.parsers.ParserConfigurationException; |
| |
| import org.apache.hc.client5.http.ClientProtocolException; |
| import org.apache.hc.client5.http.HttpResponseException; |
| import org.apache.hc.client5.http.fluent.Request; |
| import org.apache.hc.core5.http.ClassicHttpResponse; |
| import org.apache.hc.core5.http.ContentType; |
| import org.apache.hc.core5.http.HttpEntity; |
| import org.apache.hc.core5.http.HttpStatus; |
| import org.apache.hc.core5.http.io.HttpClientResponseHandler; |
| import org.w3c.dom.Document; |
| import org.xml.sax.SAXException; |
| |
| /** |
| * This example demonstrates how the HttpClient fluent API can be used to handle HTTP responses |
| * without buffering content body in memory. |
| */ |
| public class FluentResponseHandling { |
| |
| public static void main(final String... args)throws Exception { |
| final Document result = Request.get("http://somehost/content") |
| .execute().handleResponse(new HttpClientResponseHandler<Document>() { |
| |
| @Override |
| public Document handleResponse(final ClassicHttpResponse response) throws IOException { |
| final int status = response.getCode(); |
| final HttpEntity entity = response.getEntity(); |
| if (status >= HttpStatus.SC_REDIRECTION) { |
| throw new HttpResponseException(status, response.getReasonPhrase()); |
| } |
| if (entity == null) { |
| throw new ClientProtocolException("Response contains no content"); |
| } |
| final DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance(); |
| try { |
| final DocumentBuilder docBuilder = dbfac.newDocumentBuilder(); |
| final ContentType contentType = ContentType.parseLenient(entity.getContentType()); |
| if (!contentType.equals(ContentType.APPLICATION_XML)) { |
| throw new ClientProtocolException("Unexpected content type:" + contentType); |
| } |
| Charset charset = contentType.getCharset(); |
| if (charset == null) { |
| charset = StandardCharsets.ISO_8859_1; |
| } |
| return docBuilder.parse(entity.getContent(), charset.name()); |
| } catch (final ParserConfigurationException ex) { |
| throw new IllegalStateException(ex); |
| } catch (final SAXException ex) { |
| throw new ClientProtocolException("Malformed XML document", ex); |
| } |
| } |
| |
| }); |
| // Do something useful with the result |
| System.out.println(result); |
| } |
| |
| } |