（jsp+servlet+xml）xml绑定

package net.wecoding.xml.main; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.wecoding.xml.castor.MyCastor; import net.wecoding.xml.classes.Flight; import net.wecoding.xml.classes.Flights; import org.exolab.castor.xml.Marshaller; @SuppressWarnings("serial") public class Edit extends HttpServlet { Flights flights = new Flights(); public Edit() { super(); } public void destroy() { super.destroy(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("utf-8"); response.setContentType("text/html; charset=utf-8"); String carrier = request.getParameter("carrier"); String number = request.getParameter("number"); MyCastor mycastor = new MyCastor(); try{ flights = mycastor.read(); }catch(Exception e) { e.printStackTrace(); } for(int i = 0; i<flights.getFlight().size(); i++) { if(flights.getFlight().get(i).getCarrier().equals(carrier) && flights.getFlight().get(i).getNumber() == Integer.valueOf(number)) { request.setAttribute("flight", flights.getFlight().get(i)); request.setAttribute("i", i); break; } } request.getRequestDispatcher("edit.jsp").forward(request, response); } @SuppressWarnings("unchecked") public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); MyCastor mycastor = new MyCastor(); PrintWriter out = response.getWriter(); Flight flight = new NewFlight(request.getParameterMap()).getFlight(); if(flight==null){ out.print("输入不符合规范。<a href='javascript:history.go(-1)'>返回</a>"); return; } //找到相应位置 Flights flights = mycastor.read(); int i = Integer.valueOf(request.getParameter("i")); try{ flights = mycastor.read(); List<Flight> flightsList = flights.getFlight(); flightsList.set(i, flight); }catch(Exception e) { e.printStackTrace(); } //写入XML Marshaller marshaller = mycastor.write(); try { marshaller.marshal(flights); response.sendRedirect("ShowList"); } catch (Exception e) { e.printStackTrace(); out.print("写入XML文件出错了。<a href='javascript:history.go(-1)'>返回</a>"); } } public void init() throws ServletException { } }