如何将处理同类实体的servlet进行封装整合？

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javapackage com.web.Servlet;

import java.io.IOException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;

@WebServlet(/UsersServlet)public class UsersServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { List users=(List) getServletContext().getAttribute(users); if (users !=null) { for (String user : users) { response.getWriter().println(user); } } }}

package com.web.Servlet; import java.io.IOException; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.List; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.web.Bean.Users; import com.web.Biz.IUsersBiz; import com.web.Biz.impl.RolesBiz; import com.web.Biz.impl.UsersBiz; import com.web.Tools.PNTools; @WebServlet("/UsersServlet") public class UsersServlet extends HttpServlet { private static final long serialVersionUID = 1L; IUsersBiz biz = new UsersBiz(); Class c = UsersServlet.class; public UsersServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 解决编码问题 request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); String type = request.getParameter("type"); for (Method mt : c.getDeclaredMethods()) { if (mt.getName().equalsIgnoreCase(type)) { System.out.println(mt.getName()); try { mt.invoke(this, request,response); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } } } } public void deleteServlet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 获得传递的参数 int id = Integer.parseInt(request.getParameter("id")); int pageIndex = Integer.parseInt(request.getParameter("pageIndex")); int pageSize = Integer.parseInt(request.getParameter("pageSize")); // 进行删除操作并验证是否删除成功 if (biz.DeleteUsers(id) >= 1) { response.sendRedirect("UsersServlet?type=GetUsersAll&pageIndex=" + pageIndex + "&pageSize=" + pageSize + ""); } } public void getUsersAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 从其他组件获得参数 int pageIndex = Integer.parseInt(request.getParameter("pageIndex")); int pageSize = Integer .parseInt(request.getParameter("pageSize") == null ? "10" : request.getParameter("pageSize")); List list = biz.GetUsersPage(pageIndex, pageSize); // 创建和获得分页导航的参数 int count = biz.GetUsersCount(); int endPageIndex = (int) Math.ceil((double) count / pageSize); String pnString = PNTools.paging(count, pageSize, pageIndex, "UsersServlet?type=GetUsersAll"); // 将参数放进request并转发至manager.jsp request.setAttribute("pageIndex", pageIndex); request.setAttribute("pnString", pnString); request.setAttribute("endPageIndex", endPageIndex); request.setAttribute("list", list); request.setAttribute("pageSize", pageSize); request.getRequestDispatcher("manager.jsp").forward(request, response); } public void loginServlet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 接受从登录界面传来的参数 String id = request.getParameter("id"); String pwd = request.getParameter("pwd"); // 基本验证 if (id != null && !"".equals(id) && pwd != null && !"".equals(pwd)) { // 内容验证 (过滤特殊字符,脏数据) 此处省略部分代码 int sid = Integer.parseInt(id); Users info = biz.Login(sid, pwd); if (info != null) { // 将登录成功的用户设入session，用以验证合法用户 request.getSession().setAttribute("info", info); response.sendRedirect("UsersServlet?type=GetUsersAll&pageIndex=1&pageSize=10"); } else { request.setAttribute("msg", "用户名或者密码错误!"); request.getRequestDispatcher("login.jsp").forward(request, response); } } else { request.setAttribute("msg", "用户名或者密码不能为空!"); request.getRequestDispatcher("login.jsp").forward(request, response); } } public void modifyServlet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 获得传递的参数 String id = request.getParameter("id"); String pwd = request.getParameter("pwd"); String name = request.getParameter("name"); String roleid = request.getParameter("roleid"); // 基本验证 if (id != null && !"".equals(id) && pwd != null && !"".equals(pwd) && name != null && !"".equals(name)) { int sid = Integer.parseInt(id); int rid = Integer.parseInt(roleid); // 进行修改操作并验证是否成功 if (biz.ModifyUsers(sid, pwd, name, rid) >= 1) { request.setAttribute("msg", ""); getUsersAll(request, response); } else { request.setAttribute("msg", ""); getUsersAll(request, response); } } } public void registerServlet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 获得传递的参数 String id = request.getParameter("id"); String pwd = request.getParameter("pwd"); String name = request.getParameter("name"); String roleid = request.getParameter("roleid") == "" ? "1" : request.getParameter("roleid"); // 基本验证 if (id != null && !"".equals(id) && pwd != null && !"".equals(pwd) && name != null && !"".equals(name)) { int sid = Integer.parseInt(id); int rid = Integer.parseInt(roleid); // 进行注册操作并验证是否成功 if (biz.Register(sid, pwd, name, rid) >= 1) { request.setAttribute("msg", ""); request.getRequestDispatcher("/register.jsp").forward(request, response); } else { request.setAttribute("msg", ""); request.getRequestDispatcher("/register.jsp").forward(request, response); } } else { request.setAttribute("msg", "用户名或者密码等等不能为空!"); request.getRequestDispatcher("/register.jsp").forward(request, response); } } public void toUpdateUsers(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { int id = Integer.parseInt(request.getParameter("id")); Users info = biz.getUserById(id); request.setAttribute("list", new RolesBiz().getRolesAll()); request.setAttribute("info", info); request.getRequestDispatcher("modify.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }