Spring Boot項目實踐-員工管理系統（一）·準備工作

本次實戰項目主要是借鑑b站上的視頻資源【狂神說Java】SpringBoot最新教程IDEA版通俗易懂完成的，有需求的話，可以直接去b站觀看完整的視頻教程，本文若有不對之處，望不吝賜教，謝謝~

一、新建Spring Boot項目並導入資源

（1）新建spring boot項目

（2）導入靜態資源
靜態資源下載

導入靜態資源

二、創建基本信息類

注意本項目暫時是採用模擬數據庫的方法來獲取數據，未用到數據庫的相關操作。
（1）引入lombok依賴，注意還需要安裝lombok插件。

<!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

（2）創建部門類
Department.java

package com.example.employee_management.pojo;

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

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

    /**
     * 部門id
     */
    private Integer departmentId;
    /**
     * 部門名
     */
    private String departmentName;
}

（3）創建員工類
Employee.java

package com.example.employee_management.pojo;

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

import java.util.Date;

/**
 * @className: Employee
 * @description: 員工信息類
 */
@Data
@NoArgsConstructor
public class Employee {

    /**
     * 員工id
     */
    private Integer employeeId;
    /**
     * 員工姓名
     */
    private String employeeName;
    /**
     * 員工郵箱
     */
    private String email;
    /**
     * 員工性別 0-女 1-男
     */
    private Integer gender;
    /**
     * 員工部門
     */
    private Department department;
    /**
     * 員工生日 默認爲創建日期
     */
    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;
        //默認生日爲創建日期
        this.birth = new Date();
    }
}

三、創建DAO層

（1）部門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: 部門dao
 */
@Repository
public class DepartmentDao {

    /**
     * 模擬數據庫信息
     */
    private static Map<Integer, Department> departmentMap=null;
    static {
        //創建一個部門表
        departmentMap= new HashMap<>();

        departmentMap.put(101,new Department(101,"教學部"));
        departmentMap.put(102,new Department(102,"市場部"));
        departmentMap.put(103,new Department(103,"教研部"));
        departmentMap.put(104,new Department(104,"運營部"));
        departmentMap.put(105,new Department(105,"後勤部"));

    }

    /**
     * 獲得所有部門信息
     * @return
     */
    public Collection<Department> getAllDepartments(){
        return departmentMap.values();
    }

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

}

（2）員工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: 員工dao
 */
@Repository
public class EmployeeDao {

    /**
     * 模擬數據庫信息
     */
    private static Map<Integer, Employee> employeeMap=null;

    /**
     * 員工所屬部門
     */
    @Autowired
    private DepartmentDao departmentDao;

    static {
        //創建一個員工表
        employeeMap= new HashMap<>();

        employeeMap.put(1001,new Employee(1001,"a","[email protected]",1,new Department(101,"教學部")));
        employeeMap.put(1002,new Employee(1002,"b","[email protected]",1,new Department(101,"市場部")));
        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,"運營部")));
        employeeMap.put(1005,new Employee(1005,"e","[email protected]",1,new Department(101,"後勤部")));

    }

    /**
     * 員工id，相當於數據庫中的主鍵
     */
    private static Integer initId=1006;

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

        //設置部門
        employee.setDepartment(departmentDao.getDepartmentById(employee.getDepartment().getDepartmentId()));

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

    }

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

    /**
     * 通過id得到員工信息
     * @param employeeId
     * @return
     */
    public Employee getEmployeeById(Integer employeeId){
        return employeeMap.get(employeeId);
    }

    /**
     * 通過id刪除員工信息
     * @param employeeId
     */
    public void deleteEmployeeById(Integer employeeId){
        employeeMap.remove(employeeId);
    }

}

四、總結

本篇文章主要是介紹項目的準備工作。需要注意的主要有兩個地方：

• lombok
  在這裏使用lombok生成類的set/get方法以提高開發效率。

• 模擬數據庫
  按道理應結合mybatis直接使用數據庫的，但是這裏是採用模擬數據庫的方法，不使用數據庫，而用程序生成數據，在實際開發中是不可取的。

2020.04.10