springboot-项目实战:准备阶段

1 搭建一个springboot项目

参考地址:springboot-hello world

2 导入静态资源文件

文件地址:员工管理系统静态资源文件下载

导入的位置:

3 初步创建包结构

4 在pom.xml中导入lombok

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

5 在pojo层编写两个实体类

Department.java

package com.lv.pojo;

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

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

Employee.java

package com.lv.pojo;

import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

//员工表
@Data
@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 date;

    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;
        //默认的创建日期
        this.date = new Date();
    }
}

6 在dao层编写实体类对应的操作类

DepartmentDao.java

package com.lv.dao;

import com.lv.pojo.Department;
import org.springframework.stereotype.Repository;

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

//部门dao
@Repository
public class DepartmentDao {
    //模拟数据库中的数据
    private static Map<Integer, Department> departmentMap = null;
    static {
        departmentMap = new HashMap<Integer, Department>(); //创建一个部门表
        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
    public Collection<Department> getAllDepartment(){
        return departmentMap.values();
    }
    //通过id得到部门
    public Department getDepartmentById(Integer id){
        return departmentMap.get(id);
    }
}

EmployeeDao.java

package com.lv.dao;

import com.lv.pojo.Department;
import com.lv.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;

//员工Dao
@Repository
public class EmployeeDao {
    //模拟数据库中的数据
    private static Map<Integer, Employee> employeeMap = null;
    //员工所属的部门
    @Autowired
    private DepartmentDao departmentDao;
    static {
        employeeMap = new HashMap<Integer,Employee>();//创建一个员工表
        employeeMap.put(1001,new Employee(1001,"AA","AA@qq.com",0,new Department(101,"教学部")));
        employeeMap.put(1002,new Employee(1002,"BB","BB@qq.com",1,new Department(102,"市场部")));
        employeeMap.put(1003,new Employee(1003,"CC","CC@qq.com",1,new Department(103,"教研部")));
        employeeMap.put(1004,new Employee(1004,"DD","DD@qq.com",0,new Department(104,"运营部")));
        employeeMap.put(1005,new Employee(1005,"EE","EE@qq.com",1,new Department(105,"后勤部")));
    }
    //主键自增
    private static Integer initId = 1006;
    //增加一个员工
    public void employeeAdd(Employee employee){
        if (employee.getId()==null){
            employee.setId(initId++);
        }
        employee.setDepartment(departmentDao.getDepartmentById(employee.getDepartment().getId()));
        employeeMap.put(employee.getId(),employee);
    }
    //查询全部员工信息
    public Collection<Employee> getAllEmployee(){
        return employeeMap.values();
    }
    //通过id查询员工
    public Employee getEmployeeById(Integer id){
        return employeeMap.get(id);
    }
    //删除员工
    public void employeeDelete(Integer id){
        employeeMap.remove(id);
    }
}