springboot：员工管理系统-准备数据

项目准备

    做一个员工管理系统，实现员工的CRUD，我们这里不用数据库只在处理数据逻辑中模拟一下数据就好了，我们使用之前的springboot项目把之前使用过的一些代码删掉(controller，resources)

    目录结构

    需要改动的地方已经为你们标注出来了

开始代码编写

    步骤：

1. 编写pojo实体类，为了偷懒引入了lombok

   1. 部门

   //部门表
   @Data
   @AllArgsConstructor
   @NoArgsConstructor
   public class Department {
   
   private Integer id;
   private String departmentName;
   
   }
   

   2. 员工

   //员工表
   @Data
   @AllArgsConstructor
   @NoArgsConstructor
   public class Employee {
   private Integer id;
   private String lastName;
   private String email;
   private Integer gender;//0:女  1:男
   private Department department;
   private Date birth;
   
   public Employee(Integer id, String lastName, String email, Integer gender, Department department) {
       this.id = id;
       this.lastName = lastName;
       this.email = email;
       this.gender = gender;
       this.department = department;
       //默认创建日期！
       this.birth = new Date();//这里注意，这个有参构造方法中，birth=new Date。意思是birth会自动赋值当前的时间。
    }
   }
   
   

    注意点：我们这里用的主外键，员工的部门是在部门里面取出来的内容

2. 编写dao层，实现pojo实体类，做出增删改查，注意看：我们会在静态代码块里面模仿数据库中的数据

   1. 部门

   //部门操作
   @Repository
   public class DepartmentDao {
   
   //模拟数据库中的数据
   //生成一个Map集合departments，初始化赋值为空
   private static Map<Integer, Department> departments = null;
   
   // 给departments中赋值
   static {
       departments = new HashMap<Integer, Department>();//创建一个部门表
   
       departments.put(101,new Department(101,"教学部"));
       departments.put(102,new Department(102,"市场部"));
       departments.put(103,new Department(103,"校验部"));
       departments.put(104,new Department(104,"运营部"));
       departments.put(105,new Department(105,"后勤部"));
   
   }
   
   
   //获得所有部门信息 
   public Collection<Department> getDepartments() {
       return departments.values();
   }
   
   //通过id得到部门，
   public Department getDepartmentById(Integer id){
       return departments.get(id);
    }
   }
   
   

   2. 员工

   //员工Dao
   @Repository
   public class EmployeeDao {
   
   //模拟数据库中的数据
   private static Map<Integer, Employee> employees = null;
   //员工有所属的部门
   @Autowired
   private DepartmentDao departmentDao;
   static {
       employees = new HashMap<Integer, Employee>();//创建一个部门表
   
       employees.put(1001,new Employee(1001,"AA","[email protected]",0,new Department(101,"教学部")));
       employees.put(1002,new Employee(1002,"BB","[email protected]",1,new Department(102,"市场部")));
       employees.put(1003,new Employee(1003,"CC","[email protected]",0,new Department(103,"校验部")));
       employees.put(1004,new Employee(1004,"DD","[email protected]",1,new Department(104,"运营部")));
       employees.put(1005,new Employee(1005,"EE","[email protected]",0,new Department(105,"后勤部")));
   
   }
   
   //主键自增！
   private static Integer initId = 1006;
   //增加一个员工
   public void save(Employee employee){
       if (employee.getId() == null) {
           employee.setId(initId++);
       }
   
       employee.setDepartment(departmentDao.getDepartmentById(employee.getDepartment().getId()));
   
       employees.put(employee.getId(),employee);
   }
   
   //查询全部员工信息
   public Collection<Employee> getAll(){
       return employees.values();
   }
   
   //通过id查询员工
   public Employee getEmployeeBuId(Integer id) {
       return employees.get(id);
   }
   
   //删除员工通过id
   public void delete(Integer id){
       employees.remove(id);
   	}
   }
   
   

导入静态资源

    和大家分享一下静态资源，有意向的可以点击下载：
    链接：https://pan.baidu.com/s/1tc3gDuX8uIy4039BWSzhFg
    提取码：5m3q

    下载好后我们在resources目录下构建我们的静态资源以及页面

准备工作就到这里了，下一章会带大家进行首页的测试