ClientConfiguration.java

该类讲解了HttpClient的各方面的配置

package com.ydd.study.hello.httpclient;

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.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;

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;

import org.apache.http.util.EntityUtils;

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://httpbin.org/get");

                // 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(new HttpHost("myotherproxy", 8080))

                    .build();

                httpget.setConfig(requestConfig);

                // Execution context can be customized locally.

                HttpClientContext context = HttpClientContext.create();

                // Contextual attributes set the local context level will take

                // precedence over those set at the client level.

                context.setCookieStore(cookieStore);

                context.setCredentialsProvider(credentialsProvider);

                System.out.println("executing request " + httpget.getURI());

                CloseableHttpResponse response = httpclient.execute(httpget, context);

                try {

                    System.out.println("----------------------------------------");

                    System.out.println(response.getStatusLine());

                    System.out.println(EntityUtils.toString(response.getEntity()));

                    System.out.println("----------------------------------------");

                    // Once the request has been executed the local context can

                    // be used to examine updated state and various objects affected

                    // by the request execution.

                    // Last executed request

                    context.getRequest();

                    // Execution route

                    context.getHttpRoute();

                    // Target auth state

                    context.getTargetAuthState();

                    // Proxy auth state

                    context.getTargetAuthState();

                    // Cookie origin

                    context.getCookieOrigin();

                    // Cookie spec used

                    context.getCookieSpec();

                    // User security token

                    context.getUserToken();

                } finally {

                    response.close();

                }

            } finally {

                httpclient.close();

            }

        }

}

https://hc.apache.org/httpcomponents-client-ga/httpclient/examples/org/apache/http/examples/client/ClientConnectionRelease.java

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