自定义和配置HTTP请求执行和连接管理的最常见方面apache http客户端
/* * -------------------------------------------------------------------- * 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/>. * */ /* from N o w J a v a . c o m */ package org.apache.http.examples.client; import java.net.InetAddress; import java.net.UnknownHostException; import java.nio.charset.CodingErrorAction; import java.util.Arrays; import javax.net.ssl.SSLContext; import org.apache.http.Consts; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.HttpHost; import org.apache.http.HttpRequest; import org.apache.http.HttpResponse; import org.apache.http.ParseException; import org.apache.http.client.CookieStore; import org.apache.http.client.CredentialsProvider; import org.apache.http.client.config.AuthSchemes;/* from N o w J a v a . c o m - 时 代 Java*/ import org.apache.http.client.config.CookieSpecs; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.protocol.HttpClientContext; import org.apache.http.config.ConnectionConfig; import org.apache.http.config.MessageConstraints; import org.apache.http.config.Registry; import org.apache.http.config.RegistryBuilder; import org.apache.http.config.SocketConfig; import org.apache.http.conn.DnsResolver; import org.apache.http.conn.HttpConnectionFactory; import org.apache.http.conn.ManagedHttpClientConnection; import org.apache.http.conn.routing.HttpRoute; import org.apache.http.conn.socket.ConnectionSocketFactory; import org.apache.http.conn.socket.PlainConnectionSocketFactory; import org.apache.http.conn.ssl.SSLConnectionSocketFactory; import org.apache.http.impl.DefaultHttpResponseFactory; import org.apache.http.impl.client.BasicCookieStore; import org.apache.http.impl.client.BasicCredentialsProvider; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.impl.conn.DefaultHttpResponseParser; import org.apache.http.impl.conn.DefaultHttpResponseParserFactory; import org.apache.http.impl.conn.ManagedHttpClientConnectionFactory; import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; import org.apache.http.impl.conn.SystemDefaultDnsResolver; import org.apache.http.impl.io.DefaultHttpRequestWriterFactory; import org.apache.http.io.HttpMessageParser; import org.apache.http.io.HttpMessageParserFactory; import org.apache.http.io.HttpMessageWriterFactory; import org.apache.http.io.SessionInputBuffer; import org.apache.http.message.BasicHeader; import org.apache.http.message.BasicLineParser; import org.apache.http.message.LineParser; import org.apache.http.ssl.SSLContexts; import org.apache.http.util.CharArrayBuffer; /** * This example demonstrates how to customize and configure the most common aspects * of HTTP request execution and connection management. */ public class ClientConfiguration { public final static void main(String[] args) throws Exception { // Use custom message parser / writer to customize the way HTTP // messages are parsed from and written out to the data stream. HttpMessageParserFactory<HttpResponse> responseParserFactory = new DefaultHttpResponseParserFactory() { @Override public HttpMessageParser<HttpResponse> create( SessionInputBuffer buffer, MessageConstraints constraints) { LineParser lineParser = new BasicLineParser() { @Override public Header parseHeader(final CharArrayBuffer buffer) { try { return super.parseHeader(buffer); } catch (ParseException ex) { return new BasicHeader(buffer.toString(), null); } } }; return new DefaultHttpResponseParser(buffer, lineParser, DefaultHttpResponseFactory.INSTANCE, constraints) { @Override protected boolean reject(final CharArrayBuffer line, int count) { // try to ignore all garbage preceding a status line infinitely return false; } }; } }; HttpMessageWriterFactory<HttpRequest> requestWriterFactory = new DefaultHttpRequestWriterFactory(); // Use a custom connection factory to customize the process of // initialization of outgoing HTTP connections. Beside standard connection // configuration parameters HTTP connection factory can define message // parser / writer routines to be employed by individual connections. HttpConnectionFactory<HttpRoute, ManagedHttpClientConnection> connFactory = new ManagedHttpClientConnectionFactory( requestWriterFactory, responseParserFactory); // Client HTTP connection objects when fully initialized can be bound to // an arbitrary network socket. The process of network socket initialization, // its connection to a remote address and binding to a local one is controlled // by a connection socket factory. // SSL context for secure connections can be created either based on // system or application specific properties. SSLContext sslcontext = SSLContexts.createSystemDefault(); // Create a registry of custom connection socket factories for supported // protocol schemes. Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder .<ConnectionSocketFactory> create() .register("http", PlainConnectionSocketFactory.INSTANCE) .register("https", new SSLConnectionSocketFactory(sslcontext)).build(); // Use custom DNS resolver to override the system DNS resolution. DnsResolver dnsResolver = new SystemDefaultDnsResolver() { @Override public InetAddress[] resolve(final String host) throws UnknownHostException { if (host.equalsIgnoreCase("myhost")) { return new InetAddress[] { InetAddress .getByAddress(new byte[] { 127, 0, 0, 1 }) }; } else { return super.resolve(host); } } }; // Create a connection manager with custom configuration. PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager( socketFactoryRegistry, connFactory, dnsResolver); // Create socket configuration SocketConfig socketConfig = SocketConfig.custom() .setTcpNoDelay(true).build(); // Configure the connection manager to use socket configuration either // by default or for a specific host. connManager.setDefaultSocketConfig(socketConfig); connManager.setSocketConfig(new HttpHost("somehost", 80), socketConfig); // Validate connections after 1 sec of inactivity connManager.setValidateAfterInactivity(1000); // Create message constraints MessageConstraints messageConstraints = MessageConstraints.custom() .setMaxHeaderCount(200).setMaxLineLength(2000).build(); // Create connection configuration ConnectionConfig connectionConfig = ConnectionConfig.custom() .setMalformedInputAction(CodingErrorAction.IGNORE) .setUnmappableInputAction(CodingErrorAction.IGNORE) .setCharset(Consts.UTF_8) .setMessageConstraints(messageConstraints).build(); // Configure the connection manager to use connection configuration either // by default or for a specific host. connManager.setDefaultConnectionConfig(connectionConfig); connManager.setConnectionConfig(new HttpHost("somehost", 80), ConnectionConfig.DEFAULT); // Configure total max or per route limits for persistent connections // that can be kept in the pool or leased by the connection manager. connManager.setMaxTotal(100); connManager.setDefaultMaxPerRoute(10); connManager.setMaxPerRoute(new HttpRoute(new HttpHost("somehost", 80)), 20); // Use custom cookie store if necessary. CookieStore cookieStore = new BasicCookieStore(); // Use custom credentials provider if necessary. CredentialsProvider credentialsProvider = new BasicCredentialsProvider(); // Create global request configuration RequestConfig defaultRequestConfig = RequestConfig .custom() .setCookieSpec(CookieSpecs.DEFAULT) .setExpectContinueEnabled(true) .setTargetPreferredAuthSchemes( Arrays.asList(AuthSchemes.NTLM, AuthSchemes.DIGEST)) .setProxyPreferredAuthSchemes( Arrays.asList(AuthSchemes.BASIC)).build(); // Create an HttpClient with the given custom dependencies and configuration. CloseableHttpClient httpclient = HttpClients.custom() .setConnectionManager(connManager) .setDefaultCookieStore(cookieStore) .setDefaultCredentialsProvider(credentialsProvider) .setProxy(new HttpHost("myproxy", 8080)) .setDefaultRequestConfig(defaultRequestConfig).build(); try { HttpGet httpget = new HttpGet("http://www.apache.org/"); // Request configuration can be overridden at the request level. // They will take precedence over the one set at the client level. RequestConfig requestConfig = RequestConfig .copy(defaultRequestConfig).setSocketTimeout(5000) .setConnectTimeout(5000) .setConnectionRequestTimeout(5000) .setProxy(