Spring Boot项目实践-员工管理系统（一）·准备工作

本次实战项目主要是借鉴b站上的视频资源【狂神说Java】SpringBoot最新教程IDEA版通俗易懂完成的，有需求的话，可以直接去b站观看完整的视频教程，本文若有不对之处，望不吝赐教，谢谢~

一、新建Spring Boot项目并导入资源

（1）新建spring boot项目

（2）导入静态资源
静态资源下载

导入静态资源

二、创建基本信息类

注意本项目暂时是采用模拟数据库的方法来获取数据，未用到数据库的相关操作。
（1）引入lombok依赖，注意还需要安装lombok插件。

        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
        dependency>

（2）创建部门类
Department.java

package com.example.employee_management.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @className: Department
 * @description: 部分信息类
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Department {

    /**
     * 部门id
     */
    private Integer departmentId;
    /**
     * 部门名
     */
    private String departmentName;
}

（3）创建员工类
Employee.java

package com.example.employee_management.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

/**
 * @className: Employee
 * @description: 员工信息类
 */
@Data
@NoArgsConstructor
public class Employee {

    /**
     * 员工id
     */
    private Integer employeeId;
    /**
     * 员工姓名
     */
    private String employeeName;
    /**
     * 员工邮箱
     */
    private String email;
    /**
     * 员工性别 0-女 1-男
     */
    private Integer gender;
    /**
     * 员工部门
     */
    private Department department;
    /**
     * 员工生日 默认为创建日期
     */
    private Date birth;

    public Employee(Integer employeeId, String employeeName, String email, Integer gender, Department department) {
        this.employeeId = employeeId;
        this.employeeName = employeeName;
        this.email = email;
        this.gender = gender;
        this.department = department;
        //默认生日为创建日期
        this.birth = new Date();
    }
}

三、创建DAO层

（1）部门dao
DepartmentDAO.java

package com.example.employee_management.dao;

import com.example.employee_management.pojo.Department;
import org.springframework.stereotype.Repository;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**
 * @className: DepartmentDao
 * @description: 部门dao
 */
@Repository
public class DepartmentDao {

    /**
     * 模拟数据库信息
     */
    private static Map<Integer, Department> departmentMap=null;
    static {
        //创建一个部门表
        departmentMap= new HashMap<>();

        departmentMap.put(101,new Department(101,"教学部"));
        departmentMap.put(102,new Department(102,"市场部"));
        departmentMap.put(103,new Department(103,"教研部"));
        departmentMap.put(104,new Department(104,"运营部"));
        departmentMap.put(105,new Department(105,"后勤部"));

    }

    /**
     * 获得所有部门信息
     * @return
     */
    public Collection<Department> getAllDepartments(){
        return departmentMap.values();
    }

    /**
     * 通过id得到部门
     * @param departmentId
     * @return
     */
    public Department getDepartmentById(Integer departmentId){
        return departmentMap.get(departmentId);
    }

}

（2）员工dao
EmployeeDao.java

package com.example.employee_management.dao;

import com.example.employee_management.pojo.Department;
import com.example.employee_management.pojo.Employee;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**
 * @className: EmployeeDao
 * @description: 员工dao
 */
@Repository
public class EmployeeDao {

    /**
     * 模拟数据库信息
     */
    private static Map<Integer, Employee> employeeMap=null;

    /**
     * 员工所属部门
     */
    @Autowired
    private DepartmentDao departmentDao;

    static {
        //创建一个员工表
        employeeMap= new HashMap<>();

        employeeMap.put(1001,new Employee(1001,"a","[email protected]",1,new Department(101,"教学部")));
        employeeMap.put(1002,new Employee(1002,"b","[email protected]",1,new Department(101,"市场部")));
        employeeMap.put(1003,new Employee(1003,"c","[email protected]",1,new Department(101,"教研部")));
        employeeMap.put(1004,new Employee(1004,"d","[email protected]",1,new Department(101,"运营部")));
        employeeMap.put(1005,new Employee(1005,"e","[email protected]",1,new Department(101,"后勤部")));

    }

    /**
     * 员工id，相当于数据库中的主键
     */
    private static Integer initId=1006;

    /**
     * 保存新增员工
     * @param employee
     */
    public void save(Employee employee){
        //id自增
        if(employee.getEmployeeId()==null){
            employee.setEmployeeId(initId++);
        }

        //设置部门
        employee.setDepartment(departmentDao.getDepartmentById(employee.getDepartment().getDepartmentId()));

        //放入容器中去
        employeeMap.put(employee.getEmployeeId(),employee);

    }

    /**
     * 得到所有员工信息
     * @return
     */
    public Collection<Employee> getAllEmployees(){
        return employeeMap.values();
    }

    /**
     * 通过id得到员工信息
     * @param employeeId
     * @return
     */
    public Employee getEmployeeById(Integer employeeId){
        return employeeMap.get(employeeId);
    }

    /**
     * 通过id删除员工信息
     * @param employeeId
     */
    public void deleteEmployeeById(Integer employeeId){
        employeeMap.remove(employeeId);
    }

}

四、总结

本篇文章主要是介绍项目的准备工作。需要注意的主要有两个地方：

• lombok
  在这里使用lombok生成类的set/get方法以提高开发效率。

• 模拟数据库
  按道理应结合mybatis直接使用数据库的，但是这里是采用模拟数据库的方法，不使用数据库，而用程序生成数据，在实际开发中是不可取的。

2020.04.10