Controller 层实现

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。