J2EE基础：Servlet实现代理服务器功能。
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 ut = 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(newInputStreamReader(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);}}}
再发展下来才有了：大霞美的花卉基地和清源山的花博园。
