跨域访问代理 --解决跨域访问问题

public class ProxyServlet extends HttpServlet { @SuppressWarnings("unchecked") @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { try { StringBuffer query = new StringBuffer(); Enumeration e = req.getParameterNames(); while (e.hasMoreElements()) { String s = e.nextElement(); if (s != null) { query.append(s); query.append("="); query.append(req.getParameter(s)); query.append("&"); } } URL url = new URL("http://gdata.youtube.com/feeds/api/videos?" + query.toString()); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setDoOutput(true); BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())); String decodedString; StringBuffer sb = new StringBuffer(); while ((decodedString = in.readLine()) != null) { sb.append(decodedString); } in.close(); resp.getOutputStream().print(sb.toString()); } catch (Exception e) { } } }