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();              }      }