clientproxyauthentication.java

用java调用httpclient的方式获取网页内容

/*
 * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/examples/org/apache/http/examples/client/ClientProxyAuthentication.java $
 * $Revision: 698722 $
 * $Date: 2008-09-24 22:40:28 +0200 (Wed, 24 Sep 2008) $
 * ====================================================================
 *
 *  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/>.
 */

package org.apache.http.examples.client;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.impl.client.DefaultHttpClient;

/**
 * A simple example that uses HttpClient to execute an HTTP request 
 * over a secure connection tunneled through an authenticating proxy. 
 */
public class ClientProxyAuthentication {

    public static void main(String[] args) throws Exception {
        
        DefaultHttpClient httpclient = new DefaultHttpClient();

        httpclient.getCredentialsProvider().setCredentials(
                new AuthScope("localhost", 8080), 
                new UsernamePasswordCredentials("username", "password"));

        HttpHost targetHost = new HttpHost("www.verisign.com", 443, "https"); 
        HttpHost proxy = new HttpHost("localhost", 8080); 

        httpclient.getParams().setParameter
            (ConnRoutePNames.DEFAULT_PROXY, proxy);

        HttpGet httpget = new HttpGet("/");
        
        System.out.println("executing request: " + httpget.getRequestLine());
        System.out.println("via proxy: " + proxy);
        System.out.println("to target: " + targetHost);
        
        HttpResponse response = httpclient.execute(targetHost, httpget);
        HttpEntity entity = response.getEntity();

        System.out.println("----------------------------------------");
        System.out.println(response.getStatusLine());
        if (entity != null) {
            System.out.println("Response content length: " + entity.getContentLength());
        }
        if (entity != null) {
            entity.consumeContent();
        }
    }
}