一、实验介绍

1.1 实验内容

本节课程主要利用 Spring MVC 框架实现 Controller 层以及一些辅助类的实现。

1.2 实验知识点

  • Spring MVC 框架

1.3 实验环境

  • JDK1.8
  • Eclipse JavaEE

二、实验步骤

在项目 hrms 的目录 src/main/java 下新建包 com.shiyanlou.controller,作为 Controller 层的包,新建包 com.shiyanlou.util,作为辅助类的包,这些辅助类是为了使 Controller 层的代码更好维护,以及实现一些其他功能。

2.1 辅助类的实现

2.1.1 DateUtil 类

在包 com.shiyanlou.util 下建一个辅助类 DateUtil,其中的 getDate() 方法的作用是返回格式化的当前日期,代码如下:

package com.shiyanlou.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date; public class DateUtil {
public static Date getDate() throws ParseException{
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
return sdf.parse(sdf.format(date));
}
}

2.1.2 JsonDateValueProcessor 类

在包 com.shiyanlou.util 下建一个辅助类 JsonDateValueProcessor,其作用是将日期转化使之能在 easyUI 的 datagrid 中正常显示,代码如下:

package com.shiyanlou.util;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale; import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor; public class JsonDateValueProcessor implements JsonValueProcessor { private String format ="yyyy-MM-dd"; public JsonDateValueProcessor() {
super();
} public JsonDateValueProcessor(String format) {
super();
this.format = format;
} @Override
public Object processArrayValue(Object paramObject,
JsonConfig paramJsonConfig) {
return process(paramObject);
} @Override
public Object processObjectValue(String paramString, Object paramObject,
JsonConfig paramJsonConfig) {
return process(paramObject);
} private Object process(Object value){
if(value instanceof Date){
SimpleDateFormat sdf = new SimpleDateFormat(format,Locale.CHINA);
return sdf.format(value);
}
return value == null ? "" : value.toString();
}
}

2.1.3 ResponseUtil 类

在包 com.shiyanlou.util 下建一个辅助类 ResponseUtil,其 write() 方法的作用是将用 HttpServletResponse 返回前台 JSON 格式数据,同时减少 Controller 层代码的冗余,代码如下:

package com.shiyanlou.util;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

public class ResponseUtil {
public static void write(HttpServletResponse response, Object o)
throws Exception {
response.setContentType("text/html;charset=utf-8");
response.addHeader("Access-Control-Allow-Origin", "*");
PrintWriter out = response.getWriter();
out.println(o.toString());
out.flush();
out.close();
}
}

2.1.4 IntegrateObject 类

在包 com.shiyanlou.util 下建一个辅助类 IntegrateObject,其 genericAssociation() 方法的作用是完成 Employee 与 Department, Position 对象的关联映射,代码如下:

package com.shiyanlou.util;

import com.shiyanlou.domain.Department;
import com.shiyanlou.domain.Employee;
import com.shiyanlou.domain.Position; public class IntegrateObject {
/**
* 由于部门和职位在 Employee 中是对象关联映射,
* 所以不能直接接收参数,需要创建 Department 对象和 Position 对象
* */
public static void genericAssociation(Integer dept_id,Integer pos_id,Employee employee){
Department department = new Department();
department.setId(dept_id);
Position position = new Position();
position.setId(pos_id);
employee.setDepartment(department);
employee.setPosition(position);
}
}

2.2 Controller 层代码实现

2.2.1 AdminController

在包 com.shiyanlou.controller 下新建一个类 AdminController,代码如下:

package com.shiyanlou.controller;

import java.util.HashMap;
import java.util.List;
import java.util.Map; import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession; import net.sf.json.JSONArray;
import net.sf.json.JSONObject; import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam; import com.shiyanlou.domain.Admin;
import com.shiyanlou.service.AdminService;
import com.shiyanlou.util.ResponseUtil; /**类中的所有响应方法都被映射到 /admin 路径下
*
* @author shiyanlou
*
*/
@Controller
@RequestMapping("/admin")
public class AdminController { // 自动注入 adminService
@Resource
private AdminService adminService; /** 处理登录请求
*
* @param admin
* @param request
* @param session
* @return
*/
@RequestMapping("/login")
public String login(Admin admin, HttpServletRequest request,
HttpSession session) {
Admin resultAdmin = adminService.login(admin);
// 如果该登录的管理员用户名或密码错误返回错误信息
if (resultAdmin == null) {
request.setAttribute("admin", admin);
request.setAttribute("errorMsg",
"Please check your username and password!");
return "login";
} else {
// 登录成功, Session 保存该管理员的信息
session.setAttribute("currentAdmin", resultAdmin);
session.setAttribute("username", resultAdmin.getUsername());
return "redirect:main";
}
} /**处理跳转至主页请求
*
* @param model
* @return
* @throws Exception
*/
@RequestMapping(value="/main")
public String test(Model model) throws Exception{
return "home_page";
} /**处理查询管理员请求
*
* @param admin
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/list")
public String list(Admin admin, HttpServletResponse response)
throws Exception {
Map<String, Object> map = new HashMap<String, Object>();
// 判断查询条件是否为空,如果是,对条件做数据库模糊查询的处理
if (admin.getUsername() != null
&& !"".equals(admin.getUsername().trim())) {
map.put("username", "%" + admin.getUsername() + "%");
}
List<Admin> adminList = adminService.findAdmins(map);
Integer total = adminService.getCount(map);
// 将数据以 JSON 格式返回前端
JSONObject result = new JSONObject();
JSONArray jsonArray = JSONArray.fromObject(adminList);
result.put("rows", jsonArray);
result.put("total", total);
ResponseUtil.write(response, result);
return null;
} /**处理保存管理员请求
*
* @param admin
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/save")
public String save(Admin admin, HttpServletRequest request,
HttpServletResponse response) throws Exception {
int resultTotal = 0;
// 如果 id 不为空,则添加管理员,否则修改管理员
if (admin.getId() == null)
resultTotal = adminService.addAdmin(admin);
else
resultTotal = adminService.updateAdmin(admin);
JSONObject result = new JSONObject();
if (resultTotal > 0) {
result.put("success", true);
} else {
result.put("success", false);
}
ResponseUtil.write(response, result);
return null;
} /** 处理删除管理员请求
*
* @param ids
* @param response
* @param session
* @return
* @throws Exception
*/
@RequestMapping("/delete")
public String delete(@RequestParam(value = "ids") String ids,
HttpServletResponse response, HttpSession session) throws Exception {
JSONObject result = new JSONObject();
// 将要删除的管理员的 id 进行处理
String[] idsStr = ids.split(",");
for (int i = 0; i < idsStr.length; i++) {
// 不能删除超级管理员(superadmin) 和当前登录的管理员
if (idsStr[i].equals("1")||idsStr[i].equals(((Admin)session.getAttribute("currentAdmin")).getId().toString())){
result.put("success", false);
continue;
}else{
adminService.deleteAdmin(Integer.parseInt(idsStr[i]));
result.put("success", true);
}
}
ResponseUtil.write(response, result);
return null;
} /**处理退出请求
*
* @param session
* @return
* @throws Exception
*/
@RequestMapping("/logout")
public String logout(HttpSession session) throws Exception {
session.invalidate();
return "redirect:/login.jsp";
}
}

2.2.2 PostController

在包 com.shiyanlou.controller 下新建一个类 PostController,代码如下:

package com.shiyanlou.controller;

import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map; import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession; import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig; import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam; import com.shiyanlou.domain.Admin;
import com.shiyanlou.domain.Post;
import com.shiyanlou.service.PostService;
import com.shiyanlou.util.DateUtil;
import com.shiyanlou.util.JsonDateValueProcessor;
import com.shiyanlou.util.ResponseUtil; /**类中的所有响应方法都被映射到 /post 路径下
*
* @author shiyanlou
*
*/
@Controller
@RequestMapping("/post")
public class PostController { // 自动注入 postService
@Resource
private PostService postService; /**处理查询公告请求
*
* @param post
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/list")
public String list(Post post, HttpServletResponse response)
throws Exception {
Map<String, Object> map = new HashMap<String, Object>();
// 判断查询条件是否为空,如果是,对条件做数据库模糊查询的处理
if (post.getTitle() != null && !"".equals(post.getTitle().trim())) {
map.put("title", "%" + post.getTitle() + "%");
}
List<Post> postList = postService.findPosts(map);
Integer total = postService.getCount(map); // 处理日期使之能在 easyUI 的 datagrid 中正常显示
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.registerJsonValueProcessor(Date.class,
new JsonDateValueProcessor());
// 将数据以 JSON 格式返回前端
JSONObject result = new JSONObject();
JSONArray jsonArray = JSONArray.fromObject(postList, jsonConfig);
result.put("rows", jsonArray);
result.put("total", total);
ResponseUtil.write(response, result);
return null;
} /**处理保存公告请求
*
* @param post
* @param request
* @param response
* @param session
* @return
* @throws Exception
*/
@RequestMapping("/save")
public String save(Post post, HttpServletRequest request,
HttpServletResponse response, HttpSession session) throws Exception {
Admin admin = (Admin)session.getAttribute("currentAdmin");
post.setAdmin(admin);
post.setDate(DateUtil.getDate());
int resultTotal = 0;
// 如果 id 不为空,则添加公告,否则修改公告
if (post.getId() == null)
resultTotal = postService.addPost(post);
else
resultTotal = postService.updatePost(post);
JSONObject result = new JSONObject();
if (resultTotal > 0) {
result.put("success", true);
} else {
result.put("success", false);
}
ResponseUtil.write(response, result);
return null;
} /**处理删除公告请求
*
* @param ids
* @param response
* @param session
* @return
* @throws Exception
*/
@RequestMapping("/delete")
public String delete(@RequestParam(value = "ids") String ids,
HttpServletResponse response, HttpSession session) throws Exception {
JSONObject result = new JSONObject();
// 将要删除的公告的 id 进行处理
String[] idsStr = ids.split(",");
for (int i = 0; i < idsStr.length; i++) {
postService.deletePost(Integer.parseInt(idsStr[i])); }
result.put("success", true);
ResponseUtil.write(response, result);
return null;
} /**处理根据 id 查询公告请求
*
* @param id
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/getById")
public String getById(@RequestParam(value = "id") Integer id,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
Post post = postService.getPostById(id);
request.setAttribute("postContent", post.getContent());
return "postContent";
}
}

2.2.3 DeptController

在包 com.shiyanlou.controller 下新建一个类 DeptController,代码如下:

package com.shiyanlou.controller;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map; import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray;
import net.sf.json.JSONObject; import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody; import com.shiyanlou.domain.Department;
import com.shiyanlou.service.DepartmentService;
import com.shiyanlou.util.ResponseUtil; /**类中的所有响应方法都被映射到 /dept 路径下
*
* @author shiyanlou
*
*/
@Controller
@RequestMapping("/dept")
public class DeptController { // 自动注入 departmentService
@Resource
private DepartmentService departmentService; /**处理查询部门请求
*
* @param department
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/list")
public String list(Department department, HttpServletResponse response)
throws Exception {
Map<String, Object> map = new HashMap<String, Object>();
// 判断查询条件是否为空,如果是,对条件做数据库模糊查询的处理
if (department.getName() != null
&& !"".equals(department.getName().trim())) {
map.put("name", "%" + department.getName() + "%");
}
List<Department> deptList = departmentService.findDepartments(map);
Integer total = departmentService.getCount(map);
JSONObject result = new JSONObject();
JSONArray jsonArray = JSONArray.fromObject(deptList);
result.put("rows", jsonArray);
result.put("total", total);
ResponseUtil.write(response, result);
return null;
} /**处理保存部门请求
*
* @param department
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/save")
public String save(Department department, HttpServletRequest request,
HttpServletResponse response) throws Exception {
int resultTotal = 0;
// 如果 id 不为空,则添加部门,否则修改部门
if (department.getId() == null)
resultTotal = departmentService.addDepartment(department);
else
resultTotal = departmentService.updateDepartment(department);
JSONObject result = new JSONObject();
if (resultTotal > 0) {
result.put("success", true);
} else {
result.put("success", false);
}
ResponseUtil.write(response, result);
return null;
} /**处理删除部门请求
*
* @param ids
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/delete")
public String delete(@RequestParam(value = "ids") String ids,
HttpServletResponse response) throws Exception {
JSONObject result = new JSONObject();
// 将要删除的部门的 id 进行处理
String[] idsStr = ids.split(",");
for (int i = 0; i < idsStr.length; i++) {
// 捕获 service 层抛出的异常,如果捕获到则置 success 值为 false,返回给前端
try {
departmentService.deleteDepartment(Integer.parseInt(idsStr[i]));
result.put("success", true);
} catch (Exception e) {
result.put("success", false);
}
}
ResponseUtil.write(response, result);
return null;
} /**处理获得部门 id 与 name 请求,用于前端 easyUI combobox 的显示
*
* @param request
* @return
*/
@RequestMapping("/getcombobox")
@ResponseBody
public JSONArray getDept(HttpServletRequest request) {
Map<String, Object> map = new HashMap<String, Object>();
List<Department> deptList = departmentService.findDepartments(map);
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
for (Department dept : deptList) {
Map<String, Object> result = new HashMap<String, Object>();
result.put("id", dept.getId());
result.put("name", dept.getName());
list.add(result);
}
// 返回 JSON
JSONArray jsonArray = JSONArray.fromObject(list);
return jsonArray;
}
}

2.2.4 PositionController

在包 com.shiyanlou.controller 下新建一个类 PositionController,代码如下:

package com.shiyanlou.controller;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map; import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray;
import net.sf.json.JSONObject; import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody; import com.shiyanlou.domain.Position;
import com.shiyanlou.service.PositionService;
import com.shiyanlou.util.ResponseUtil; /**类中的所有响应方法都被映射到 /position 路径下
*
* @author shiyanlou
*
*/
@Controller
@RequestMapping("/position")
public class PositionController { // 自动注入 positionService
@Resource
private PositionService positionService; /**处理查询职位请求
*
* @param position
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/list")
public String list(Position position, HttpServletResponse response)
throws Exception {
Map<String, Object> map = new HashMap<String, Object>();
// 判断查询条件是否为空,如果是,对条件做数据库模糊查询的处理
if (position.getName() != null
&& !"".equals(position.getName().trim())) {
map.put("name", "%" + position.getName() + "%");
}
List<Position> dpositionList = positionService.findPositions(map);
Integer total = positionService.getCount(map);
JSONObject result = new JSONObject();
JSONArray jsonArray = JSONArray.fromObject(dpositionList);
result.put("rows", jsonArray);
result.put("total", total);
ResponseUtil.write(response, result);
return null;
} /**处理保存职位请求
*
* @param position
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/save")
public String save(Position position, HttpServletRequest request,
HttpServletResponse response) throws Exception {
int resultTotal = 0;
// 如果 id 不为空,则添加职位,否则修改职位
if (position.getId() == null)
resultTotal = positionService.addPosition(position);
else
resultTotal = positionService.updatePosition(position);
JSONObject result = new JSONObject();
if (resultTotal > 0) {
result.put("success", true);
} else {
result.put("success", false);
}
ResponseUtil.write(response, result);
return null;
} /**处理删除职位请求
*
* @param ids
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/delete")
public String delete(@RequestParam(value = "ids") String ids,
HttpServletResponse response) throws Exception {
JSONObject result = new JSONObject();
// 将要删除的部门的 id 进行处理
String[] idsStr = ids.split(",");
for (int i = 0; i < idsStr.length; i++) {
// 捕获 service 层抛出的异常,如果捕获到则置 success 值为 false,返回给前端
try {
positionService.deletePosition(Integer.parseInt(idsStr[i]));
result.put("success", true);
} catch (Exception e) {
result.put("success", false);
}
}
ResponseUtil.write(response, result);
return null;
} /**处理获得职位 id 与 name 请求,用于前端 easyUI combobox 的显示
*
* @param request
* @return
*/
@RequestMapping("/getcombobox")
@ResponseBody
public JSONArray getPos(HttpServletRequest request) {
Map<String, Object> map = new HashMap<String, Object>();
List<Position> posList = positionService.findPositions(map);
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
for (Position pos : posList) {
Map<String, Object> result = new HashMap<String, Object>();
result.put("id", pos.getId());
result.put("name", pos.getName());
list.add(result);
}
// 返回 JSON
JSONArray jsonArray = JSONArray.fromObject(list);
return jsonArray;
}
}

2.2.5 EmployeeController

在包 com.shiyanlou.controller 下新建一个类 EmployeeController,代码如下:

package com.shiyanlou.controller;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map; import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession; import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig; import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam; import com.shiyanlou.domain.Employee;
import com.shiyanlou.domain.Post;
import com.shiyanlou.service.EmployeeService;
import com.shiyanlou.util.IntegrateObject;
import com.shiyanlou.util.JsonDateValueProcessor;
import com.shiyanlou.util.ResponseUtil; /**类中的所有响应方法都被映射到 /empl 路径下
*
* @author shiyanlou
*
*/
@Controller
@RequestMapping("/empl")
public class EmployeeController { // 自动注入 employeeService
@Resource
private EmployeeService employeeService; /**处理查询员工请求
*
* @param employee
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping("/list")
public String list(Employee employee, HttpServletRequest request,
HttpServletResponse response) throws Exception {
Map<String, Object> map = new HashMap<String, Object>();
// 判断查询条件是否为空,如果是,对条件做数据库模糊查询的处理
if (employee.getId() != null && !"".equals(employee.getId().trim())) {
map.put("id", "%" + employee.getId() + "%");
}
if (employee.getName() != null && !"".equals(employee.getName().trim())) {
map.put("name", "%" + employee.getName() + "%");
}
if (employee.getSex() != null && !"".equals(employee.getSex().trim())) {
map.put("sex", "%" + employee.getSex() + "%");
}
if (employee.getDepartment() != null) {
if (employee.getDepartment().getName() != null
&& !"".equals(employee.getDepartment().getName().trim())) {
map.put("department_name", "%"
+ employee.getDepartment().getName() + "%");
}
}
if (employee.getPosition() != null) {
if (employee.getPosition().getName() != null
&& !"".equals(employee.getPosition().getName().trim())) {
map.put("position_name", "%" + employee.getPosition().getName()
+ "%");
}
}
List<Post> postList = employeeService.findEmployees(map);
Integer total = employeeService.getCount(map);
// 处理日期使之能在 easyUI 的 datagrid 中正常显示
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.registerJsonValueProcessor(Date.class,
new JsonDateValueProcessor()); JSONObject result = new JSONObject();
JSONArray jsonArray = JSONArray.fromObject(postList, jsonConfig);
result.put("rows", jsonArray);
result.put("total", total);
ResponseUtil.write(response, result);
return null;
} /**处理保存员工请求
*
* @param dept_id
* @param pos_id
* @param updateFlag
* @param employee
* @param request
* @param response
* @param session
* @return
* @throws Exception
*/
@RequestMapping("/save")
public String save(@RequestParam("dept_id") Integer dept_id,
@RequestParam("pos_id") Integer pos_id, @RequestParam("updateFlag") String updateFlag, Employee employee,
HttpServletRequest request, HttpServletResponse response,
HttpSession session) throws Exception {
int resultTotal = 0;
// 完成 Department 和 Position 在 Employee 中的关联映射
IntegrateObject.genericAssociation(dept_id, pos_id, employee); JSONObject result = new JSONObject();
// 根据 updateFlag 的值,判断保存方式,如果值为 no,则添加员工,如果值为 yes,则修改员工
if (updateFlag.equals("no")){
// 捕获 service 层插入时主键重复抛出的异常,如果捕获到则置 success 值为 false,返回给前端
try {
resultTotal = employeeService.addEmployee(employee);
if (resultTotal > 0) {
result.put("success", true);
} else {
result.put("success", false);
}
} catch (Exception e) {
result.put("success", false);
} }else if(updateFlag.equals("yes")){
resultTotal = employeeService.updateEmployee(employee);
if (resultTotal > 0) {
result.put("success", true);
} else {
result.put("success", false);
}
}
ResponseUtil.write(response, result);
return null;
} /**处理删除员工请求
*
* @param ids
* @param response
* @param session
* @return
* @throws Exception
*/
@RequestMapping("/delete")
public String delete(@RequestParam(value = "ids") String ids,
HttpServletResponse response, HttpSession session) throws Exception {
JSONObject result = new JSONObject();
// 将要删除的部门的 id 进行处理
String[] idsStr = ids.split(",");
for (int i = 0; i < idsStr.length; i++) {
employeeService.deleteEmployee(idsStr[i]); }
result.put("success", true);
ResponseUtil.write(response, result);
return null;
} /**springmvc 日期绑定
*
* @param binder
*/
@InitBinder
public void initBinder(WebDataBinder binder) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
CustomDateEditor editor = new CustomDateEditor(dateFormat, true);
binder.registerCustomEditor(Date.class, editor);
} }

三、实验总结

到这里我们就完成了 Controller 层的代码实现,下一节我们将完成表现层 JSP 页面的实现。

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