import org.apache.http.impl.client.ProxyClient; //导入依赖的package包/类
public final static void main(String[] args) throws Exception {

        ProxyClient proxyClient = new ProxyClient();
        HttpHost target = new HttpHost("www.yahoo.com", 80);
        HttpHost proxy = new HttpHost("localhost", 8888);
        UsernamePasswordCredentials credentials = new UsernamePasswordCredentials("user", "pwd");
        Socket socket = proxyClient.tunnel(proxy, target, credentials);
        try {
            Writer out = new OutputStreamWriter(socket.getOutputStream(), HTTP.DEF_CONTENT_CHARSET);
            out.write("GET / HTTP/1.1\r\n");
            out.write("Host: " + target.toHostString() + "\r\n");
            out.write("Agent: whatever\r\n");
            out.write("Connection: close\r\n");
            out.write("\r\n");
            out.flush();
            BufferedReader in = new BufferedReader(
                    new InputStreamReader(socket.getInputStream(), HTTP.DEF_CONTENT_CHARSET));
            String line = null;
            while ((line = in.readLine()) != null) {
                System.out.println(line);
            }
        } finally {
            socket.close();
        }
    }
 

import org.apache.http.impl.client.ProxyClient; //导入依赖的package包/类
private static ProxyClient createClient() {
	ProxyClient client = new ProxyClient();

	HttpConnectionParams.setConnectionTimeout(client.getParams(), 3000);
	HttpConnectionParams.setSoTimeout(client.getParams(), 3000);

	return client;
}
 

import org.apache.http.impl.client.ProxyClient; //导入依赖的package包/类
private ProxyClient buildProxyClient() {
    RequestConfig requestConfig = RequestConfig.custom().setProxyPreferredAuthSchemes(singleton(NTLM)).build();
    ProxyClient proxyClient = new ProxyClient(requestConfig);
    proxyClient.getAuthSchemeRegistry().register(NTLM, new NTLMSchemeProvider());
    return proxyClient;
}