Servlet实现的代理服务器功能

<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> import java.io.*; import java.net.*; import javax.servlet.*; import javax.servlet.http.*; public class Proxy extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String query = null; response.setContentType("text/html"); PrintWriter out = response.getWriter(); query = request.getParameter("URL"); if (query == null) { response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Missing URL parameter"); return; } try { query = URLDecoder.decode(query); } catch(Exception exception) { response.sendError(HttpServletResponse.SC_BAD_REQUEST, "URL decode error " exception); return; } try { URL url = new URL(query); BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream())); String line; while ((line = in.readLine()) != null) out.println(line); out.flush(); } catch(IOException exception) { response.sendError(HttpServletResponse.SC_NOT_FOUND, "Exception: " exception); } } }