src/examples/MultiThreadedExample.java

/*
 * $HeadURL$
 * $Revision$
 * $Date$
 *
 * ====================================================================
 *
 *  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/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */
 
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
import org.apache.commons.httpclient.methods.GetMethod;

/**
 * An example that performs GETs from multiple threads.
 * 
 * @author Michael Becke
 */
public class MultiThreadedExample {

    /**
     * Constructor for MultiThreadedExample.
     */
    public MultiThreadedExample() {
        super();
    }

    public static void main(String[] args) {
        
        // Create an HttpClient with the MultiThreadedHttpConnectionManager.
        // This connection manager must be used if more than one thread will
        // be using the HttpClient.
        HttpClient httpClient = new HttpClient(new MultiThreadedHttpConnectionManager());
        // Set the default host/protocol for the methods to connect to.
        // This value will only be used if the methods are not given an absolute URI
        httpClient.getHostConfiguration().setHost("hc.apache.org", 80, "http");
        
        // create an array of URIs to perform GETs on
        String[] urisToGet = {
            "/",
            "/httpclient-3.x/status.html",
            "/httpclient-3.x/methods/",
            "http://svn.apache.org/viewvc/httpcomponents/oac.hc3x/"
        };
        
        // create a thread for each URI
        GetThread[] threads = new GetThread[urisToGet.length];
        for (int i = 0; i < threads.length; i++) {
            GetMethod get = new GetMethod(urisToGet[i]);
            get.setFollowRedirects(true);
            threads[i] = new GetThread(httpClient, get, i + 1);
        }
        
        // start the threads
        for (int j = 0; j < threads.length; j++) {
            threads[j].start();
        }
        
    }
    
    /**
     * A thread that performs a GET.
	 */
    static class GetThread extends Thread {
        
        private HttpClient httpClient;
        private GetMethod method;
        private int id;
        
        public GetThread(HttpClient httpClient, GetMethod method, int id) {
            this.httpClient = httpClient;
            this.method = method;
            this.id = id;
        }
        
        /**
         * Executes the GetMethod and prints some satus information.
         */
        public void run() {
            
            try {
                
                System.out.println(id + " - about to get something from " + method.getURI());
                // execute the method
                httpClient.executeMethod(method);
                
                System.out.println(id + " - get executed");
                // get the response body as an array of bytes
                byte[] bytes = method.getResponseBody();
                
                System.out.println(id + " - " + bytes.length + " bytes read");
                
            } catch (Exception e) {
                System.out.println(id + " - error: " + e);
            } finally {
                // always release the connection after we're done 
                method.releaseConnection();
                System.out.println(id + " - connection released");
            }
        }
       
    }
    
}
1	/*
2	* $HeadURL$
3	* $Revision$
4	* $Date$
5	*
6	* ====================================================================
7	*
8	* Licensed to the Apache Software Foundation (ASF) under one or more
9	* contributor license agreements. See the NOTICE file distributed with
10	* this work for additional information regarding copyright ownership.
11	* The ASF licenses this file to You under the Apache License, Version 2.0
12	* (the "License"); you may not use this file except in compliance with
13	* the License. You may obtain a copy of the License at
14	*
15	* http://www.apache.org/licenses/LICENSE-2.0
16	*
17	* Unless required by applicable law or agreed to in writing, software
18	* distributed under the License is distributed on an "AS IS" BASIS,
19	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
20	* See the License for the specific language governing permissions and
21	* limitations under the License.
22	* ====================================================================
23	*
24	* This software consists of voluntary contributions made by many
25	* individuals on behalf of the Apache Software Foundation. For more
26	* information on the Apache Software Foundation, please see
27	* <http://www.apache.org/>.
28	*
29	* [Additional notices, if required by prior licensing conditions]
30	*
31	*/
32
33	import org.apache.commons.httpclient.HttpClient;
34	import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
35	import org.apache.commons.httpclient.methods.GetMethod;
36
37	/**
38	* An example that performs GETs from multiple threads.
39	*
40	* @author Michael Becke
41	*/
42	public class MultiThreadedExample {
43
44	/**
45	* Constructor for MultiThreadedExample.
46	*/
47	public MultiThreadedExample() {
48	super();
49	}
50
51	public static void main(String[] args) {
52
53	// Create an HttpClient with the MultiThreadedHttpConnectionManager.
54	// This connection manager must be used if more than one thread will
55	// be using the HttpClient.
56	HttpClient httpClient = new HttpClient(new MultiThreadedHttpConnectionManager());
57	// Set the default host/protocol for the methods to connect to.
58	// This value will only be used if the methods are not given an absolute URI
59	httpClient.getHostConfiguration().setHost("hc.apache.org", 80, "http");
60
61	// create an array of URIs to perform GETs on
62	String[] urisToGet = {
63	"/",
64	"/httpclient-3.x/status.html",
65	"/httpclient-3.x/methods/",
66	"http://svn.apache.org/viewvc/httpcomponents/oac.hc3x/"
67	};
68
69	// create a thread for each URI
70	GetThread[] threads = new GetThread[urisToGet.length];
71	for (int i = 0; i < threads.length; i++) {
72	GetMethod get = new GetMethod(urisToGet[i]);
73	get.setFollowRedirects(true);
74	threads[i] = new GetThread(httpClient, get, i + 1);
75	}
76
77	// start the threads
78	for (int j = 0; j < threads.length; j++) {
79	threads[j].start();
80	}
81
82	}
83
84	/**
85	* A thread that performs a GET.
86	*/
87	static class GetThread extends Thread {
88
89	private HttpClient httpClient;
90	private GetMethod method;
91	private int id;
92
93	public GetThread(HttpClient httpClient, GetMethod method, int id) {
94	this.httpClient = httpClient;
95	this.method = method;
96	this.id = id;
97	}
98
99	/**
100	* Executes the GetMethod and prints some satus information.
101	*/
102	public void run() {
103
104	try {
105
106	System.out.println(id + " - about to get something from " + method.getURI());
107	// execute the method
108	httpClient.executeMethod(method);
109
110	System.out.println(id + " - get executed");
111	// get the response body as an array of bytes
112	byte[] bytes = method.getResponseBody();
113
114	System.out.println(id + " - " + bytes.length + " bytes read");
115
116	} catch (Exception e) {
117	System.out.println(id + " - error: " + e);
118	} finally {
119	// always release the connection after we're done
120	method.releaseConnection();
121	System.out.println(id + " - connection released");
122	}
123	}
124
125	}
126
127	}
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