package com.gqx.demo1;import java.io.IOException;import java.io.PrintWriter;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.ArrayList;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class AuthorityServlet extends HttpServlet { private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String methodName=request.getParameter("method"); //为了让一个servlet响应多个请求，这里可以使用反射 try { Method method=getClass().getMethod(methodName, HttpServletRequest.class,HttpServletResponse.class); method.invoke(this, request,response); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } private UserDao userDao=new UserDao(); //获取用户所有的信息 public void getAuthorities(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String userName=request.getParameter("username"); User user =userDao.get(userName); request.setAttribute("user", user); request.setAttribute("authorities", userDao.getAuthorities()); request.getRequestDispatcher("/authority-manager.jsp").forward(request, response); } public void updateAuthority(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username = request.getParameter("username"); String [] authorities = request.getParameterValues("authority"); List<Authority> authorityList = userDao.getAuthorities(authorities); userDao.update(username, authorityList); response.sendRedirect(request.getContextPath() + "/authority-manager.jsp"); } }原文：http://www.cnblogs.com/zhangyubao/p/6973791.html