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Simple text mode HttpClient application E-mail
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This is a simple text mode application that demonstrates how to use the Jakarta HttpClient API.

/*
 * $Header: 
 * $Revision$
 * $Date$
 *
 * ====================================================================
 *
 *  Copyright 2002-2004 The Apache Software Foundation
 *
 *  Licensed 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 java.io.IOException;

import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.GetMethod;

/**
 *
 * This is a simple text mode application that demonstrates
 * how to use the Jakarta HttpClient API.
 *
 @author <a href="mailto: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it ">Jeff Dever</a>
 @author Ortwin Glück
 */
public class TrivialApp {
    
    private static final void printUsage() {
        
        System.out.println();
        System.out.println("Usage: java -classpath <classpath> "+
            "[-Dorg.apache.commons.logging.simplelog.defaultlog=<loglevel>]"+
            " TrivialApp <url> [<username> <password>]");
        
        System.out.println("<classpath> - must contain the "+
            "commons-httpclient.jar and commons-logging.jar");
        
        System.out.println("<loglevel> - one of error, warn, "+
            "info, debug, trace");
        
        System.out.println("<url> - some valid URL");
        System.out.println("<username> - username for protected page");
        System.out.println("<password> - password for protected page");
        System.out.println();
        
    }
    
    public static void main(String[] args) {
        
        if ((args.length != 1&& (args.length != 3)) {
            printUsage();
            System.exit(-1);
        }
        
        Credentials creds = null;
        
        if (args.length >= 3) {
            creds = new UsernamePasswordCredentials(args[1], args[2]);
        }
        
        //create a singular HttpClient object
        HttpClient client = new HttpClient();
        
        //establish a connection within 5 seconds
        client.getHttpConnectionManager().
                getParams().setConnectionTimeout(5000);
        
        //set the default credentials
        if (creds != null) {
            client.getState().setCredentials(AuthScope.ANY, creds);
        }
        
        String url = args[0];
        HttpMethod method = null;
        
        //create a method object
        method = new GetMethod(url);
        method.setFollowRedirects(true);
        //} catch (MalformedURLException murle) {
        //    System.out.println("<url> argument '" + url
        //            + "' is not a valid URL");
        //    System.exit(-2);
        //}
        
        //execute the method
        String responseBody = null;
        
        try{
            
            client.executeMethod(method);
            responseBody = method.getResponseBodyAsString();
            
        catch (HttpException he) {
            
            System.err.println("Http error connecting to '" + url + "'");
            System.err.println(he.getMessage());
            System.exit(-4);
            
        catch (IOException ioe){
            
            System.err.println("Unable to connect to '" + url + "'");
            System.exit(-3);
            
        }
        
        
        //write out the request headers
        System.out.println("*** Request ***");
        System.out.println("Request Path: " + method.getPath());
        System.out.println("Request Query: " + method.getQueryString());
        
        Header[] requestHeaders = method.getRequestHeaders();
        
        for (int i=0; i<requestHeaders.length; i++){
            System.out.print(requestHeaders[i]);
        }
        
        //write out the response headers
        System.out.println("*** Response ***");
        System.out.println("Status Line: " + method.getStatusLine());
        Header[] responseHeaders = method.getResponseHeaders();
        
        for (int i=0; i<responseHeaders.length; i++){
            System.out.print(responseHeaders[i]);
        }
        
        //write out the response body
        System.out.println("*** Response Body ***");
        System.out.println(responseBody);
        
        //clean up the connection resources
        method.releaseConnection();
        
        System.exit(0);
    }
}

Source: Apache HttpClient


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