java通过代理访问网络

使用代理方式连接到网络

@Testpublic 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);}

至于如何在连接网络的时候弹出IE的代理框让用户输入不知道怎么实现的

还有获取IE代理也不知道怎么获取的