| /* |
| * ==================================================================== |
| * 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.http.examples.client; |
| |
| import java.io.IOException; |
| |
| import org.apache.http.Header; |
| import org.apache.http.HeaderElement; |
| import org.apache.http.HttpEntity; |
| import org.apache.http.HttpException; |
| import org.apache.http.HttpRequest; |
| import org.apache.http.HttpRequestInterceptor; |
| import org.apache.http.HttpResponse; |
| import org.apache.http.HttpResponseInterceptor; |
| import org.apache.http.client.entity.GzipDecompressingEntity; |
| import org.apache.http.client.methods.HttpGet; |
| import org.apache.http.impl.client.DefaultHttpClient; |
| import org.apache.http.protocol.HttpContext; |
| import org.apache.http.util.EntityUtils; |
| |
| /** |
| * Demonstration of the use of protocol interceptors to transparently |
| * modify properties of HTTP messages sent / received by the HTTP client. |
| * <p/> |
| * In this particular case HTTP client is made capable of transparent content |
| * GZIP compression by adding two protocol interceptors: a request interceptor |
| * that adds 'Accept-Encoding: gzip' header to all outgoing requests and |
| * a response interceptor that automatically expands compressed response |
| * entities by wrapping them with a uncompressing decorator class. The use of |
| * protocol interceptors makes content compression completely transparent to |
| * the consumer of the {@link org.apache.http.client.HttpClient HttpClient} |
| * interface. |
| */ |
| public class ClientGZipContentCompression { |
| |
| public final static void main(String[] args) throws Exception { |
| DefaultHttpClient httpclient = new DefaultHttpClient(); |
| try { |
| httpclient.addRequestInterceptor(new HttpRequestInterceptor() { |
| |
| public void process( |
| final HttpRequest request, |
| final HttpContext context) throws HttpException, IOException { |
| if (!request.containsHeader("Accept-Encoding")) { |
| request.addHeader("Accept-Encoding", "gzip"); |
| } |
| } |
| |
| }); |
| |
| httpclient.addResponseInterceptor(new HttpResponseInterceptor() { |
| |
| public void process( |
| final HttpResponse response, |
| final HttpContext context) throws HttpException, IOException { |
| HttpEntity entity = response.getEntity(); |
| if (entity != null) { |
| Header ceheader = entity.getContentEncoding(); |
| if (ceheader != null) { |
| HeaderElement[] codecs = ceheader.getElements(); |
| for (int i = 0; i < codecs.length; i++) { |
| if (codecs[i].getName().equalsIgnoreCase("gzip")) { |
| response.setEntity( |
| new GzipDecompressingEntity(response.getEntity())); |
| return; |
| } |
| } |
| } |
| } |
| } |
| |
| }); |
| |
| HttpGet httpget = new HttpGet("http://www.apache.org/"); |
| |
| // Execute HTTP request |
| System.out.println("executing request " + httpget.getURI()); |
| HttpResponse response = httpclient.execute(httpget); |
| |
| System.out.println("----------------------------------------"); |
| System.out.println(response.getStatusLine()); |
| System.out.println(response.getLastHeader("Content-Encoding")); |
| System.out.println(response.getLastHeader("Content-Length")); |
| System.out.println("----------------------------------------"); |
| |
| HttpEntity entity = response.getEntity(); |
| |
| if (entity != null) { |
| String content = EntityUtils.toString(entity); |
| System.out.println(content); |
| System.out.println("----------------------------------------"); |
| System.out.println("Uncompressed size: "+content.length()); |
| } |
| |
| } finally { |
| // When HttpClient instance is no longer needed, |
| // shut down the connection manager to ensure |
| // immediate deallocation of all system resources |
| httpclient.getConnectionManager().shutdown(); |
| } |
| } |
| |
| } |
| |