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Java example source code file (ClientExecuteDirect.java)

This example source code file (ClientExecuteDirect.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

basichttpparams, clientconnectionmanager, clientexecutedirect, defaulthttpclient, exception, header, httpentity, httpget, httphost, httpresponse, schemeregistry, threadsafeclientconnmanager, utf-8

The ClientExecuteDirect.java example source code

 * ====================================================================
 * 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
 * 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 org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.util.EntityUtils;

 * How to send a request directly using {@link HttpClient}.
 * @since 4.0
public class ClientExecuteDirect {

    public static void main(String[] args) throws Exception {

        HttpHost target = new HttpHost("www.apache.org", 80, "http");

        // general setup
        SchemeRegistry supportedSchemes = new SchemeRegistry();

        // Register the "http" protocol scheme, it is required
        // by the default operator to look up socket factories.
        supportedSchemes.register(new Scheme("http", 
                PlainSocketFactory.getSocketFactory(), 80));

        // prepare parameters
        HttpParams params = new BasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, "UTF-8");
        HttpProtocolParams.setUseExpectContinue(params, true);

        ClientConnectionManager connMgr = new ThreadSafeClientConnManager(params, 
        DefaultHttpClient httpclient = new DefaultHttpClient(connMgr, params);

        HttpGet req = new HttpGet("/");

        System.out.println("executing request to " + target);

        HttpResponse rsp = httpclient.execute(target, req);
        HttpEntity entity = rsp.getEntity();

        Header[] headers = rsp.getAllHeaders();
        for (int i = 0; i < headers.length; i++) {

        if (entity != null) {

        // When HttpClient instance is no longer needed, 
        // shut down the connection manager to ensure
        // immediate deallocation of all system resources


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