@Test    public void t13(){        String charset = "utf-8" ;         String proxyHost = "代理地址" ;         int proxyPort = 1234 ; //代理端口        String proxyUrsername = "登陆代理服务器的用户名" ;         String proxyPassword = "登陆代理服务器的密码" ;         String urlStr = "http://www.baidu.com" ;         String ret = "" ;         InputStream is = null ;          try {            Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort)) ;            URL url = new URL(urlStr) ;            HttpURLConnection connection = (HttpURLConnection) url.openConnection(proxy) ;            BASE64Encoder encoder = new BASE64Encoder() ;            String authorization = new String(encoder.encode(new String(proxyUrsername+":"+proxyPassword).getBytes()));            connection.setRequestProperty("Proxy-Authorization", "Basic " + authorization);              connection.setDoInput(true);             connection.setRequestMethod("GET");            connection.connect() ;             is = connection.getInputStream() ;            StringBuffer sb = new StringBuffer() ;             int rl = -1 ;             byte[] buf = new byte[1024] ;             while( (rl=is.read(buf))!=-1 ){                sb.append(new String(buf, 0, rl, charset)) ;             }            ret = sb.toString() ;             connection.disconnect() ;        } catch (MalformedURLException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } finally {            if( is != null ){                try {                    is.close() ;                } catch (IOException e) {                    e.printStackTrace();                }             }        }        System.out.println(ret);    }