java inputstream 字符串

           bif = new BufferedInputStream(conn.getInputStream());

           byte[] buffer = new byte[conn.getContentLength()];

           bif.read(buffer);

           bif.close();

           ByteToCharConverter converter = ByteToCharConverter.getConverter("UTF-8");

           char c[] = converter.convertAll(buffer);  

           String credential = new String(c);