JAVA HTTP连接（HttpURLConnection）中使用代理（Proxy）及其验证(Authentication)

public static void main(String[] args) {
		// TODO Auto-generated method stub
		 try {
	            URL url = new URL("http://www.baidu.com");
	            // 创建代理服务器
	            InetSocketAddress addr = new InetSocketAddress("172.21.1.8",80);
	            Proxy proxy = new Proxy(Proxy.Type.HTTP, addr); // http 代理
	            URLConnection conn = url.openConnection(proxy);

                    //以下三行是在需要验证时，输入帐号密码信息
	            String headerkey = "Proxy-Authorization";
	            String headerValue = "Basic "+Base64.encodeToString("atco:atco".getBytes(), false);	//帐号密码用:隔开，base64加密方式
	            conn.setRequestProperty(headerkey, headerValue);
	            
	            InputStream in = conn.getInputStream();
	            // InputStream in = url.openStream();
	            String s = IOUtils.toString(in, "utf-8");
	            System.out.println(s);
	        } catch (Exception e) {
	            e.printStackTrace();
	        }
	}