Service 层实现

一、实验介绍

1.1 实验内容

本节课程主要利用 Spring 框架实现 Service 层。

1.2 实验知识点

• Spring 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.service，作为 Servcie 层接口的包，新建包 com.shiyanlou.service.impl 作为 Servcie 层实现的包。

2.1 AdminService 接口与实现

在包 com.shiyanlou.service 下建一个 AdminService.java 接口文件，代码如下：

package com.shiyanlou.service;

import java.util.List;
import java.util.Map;

import com.shiyanlou.domain.Admin;

public interface AdminService {

    /** 登录
     * 
     * @param admin
     * @return
     */
    public Admin login(Admin admin);

    /** 根据条件查询管理员
     * 
     * @param map
     * @return
     */
    public List<Admin> findAdmins(Map<String, Object> map);

    /** 根据条件查询管理员人数
     * 
     * @param map
     * @return
     */
    public Integer getCount(Map<String, Object> map);

    /** 添加管理员
     * 
     * @param admin
     * @return
     */
    public Integer addAdmin(Admin admin);

    /** 修改管理员
     * 
     * @param admin
     * @return
     */
    public Integer updateAdmin(Admin admin);

    /** 删除管理员
     * 
     * @param id
     * @return
     */
    public Integer deleteAdmin(Integer id);
}

在包 com.shiyanlou.service.impl 下建一个类 AdminServiceImpl 实现上述的接口，代码如下：

package com.shiyanlou.service.impl;

import java.util.List;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.shiyanlou.dao.AdminDao;
import com.shiyanlou.domain.Admin;
import com.shiyanlou.service.AdminService;

@Service("adminService")
public class AdminServiceImpl implements AdminService {

    // 自动注入 DAO 对象
    @Resource
    private AdminDao adminDao;

    // 实现接口中的方法    

    @Override
    public Admin login(Admin admin) {

        return adminDao.login(admin);
    }

    @Override
    public List<Admin> findAdmins(Map<String, Object> map) {

        return adminDao.findAdmins(map);
    }

    @Override
    public Integer getCount(Map<String, Object> map) {

        return adminDao.getCount(map);
    }

    @Override
    public Integer addAdmin(Admin admin) {

        return adminDao.addAdmin(admin);
    }

    @Override
    public Integer updateAdmin(Admin admin) {

        return adminDao.updateAdmin(admin);
    }

    @Override
    public Integer deleteAdmin(Integer id) {

        return adminDao.deleteAdmin(id);
    }

}

2.2 PostService 接口与实现

在包 com.shiyanlou.service 下建一个 PostService.java 接口文件，代码如下：

package com.shiyanlou.service;

import java.util.List;
import java.util.Map;

import com.shiyanlou.domain.Post;

public interface PostService {

    /** 根据条件查询公告
     * 
     * @param map
     * @return
     */
    public List<Post>findPosts(Map<String, Object> map);

    /** 根据条件查询公告数量
     * 
     * @param map
     * @return
     */
    public Integer getCount(Map<String, Object> map);

    /** 添加公告
     * 
     * @param post
     * @return
     */    
    public Integer addPost(Post post);

    /** 修改公告
     * 
     * @param post
     * @return
     */
    public Integer updatePost(Post post);

    /** 删除公告
     * 
     * @param id
     * @return
     */
    public Integer deletePost(Integer id);

    /** 根据 ID 查询公告信息
     * 
     * @param id
     * @return
     */
    public Post getPostById(Integer id);
}

在包 com.shiyanlou.service.impl 下建一个类 PostServiceImpl 实现上述的接口，代码如下：

package com.shiyanlou.service.impl;

import java.util.List;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.shiyanlou.dao.PostDao;
import com.shiyanlou.domain.Post;
import com.shiyanlou.service.PostService;
@Service("postService")
public class PostServiceImpl implements PostService {

    // 自动注入 DAO 对象
    @Resource
    private PostDao postDao;

    // 实现接口中的方法

    @Override
    public List<Post> findPosts(Map<String, Object> map) {

        return postDao.findPosts(map);
    }

    @Override
    public Integer getCount(Map<String, Object> map) {

        return postDao.getCount(map);
    }

    @Override
    public Integer addPost(Post post) {

        return postDao.addPost(post);
    }

    @Override
    public Integer updatePost(Post post) {

        return postDao.updatePost(post);
    }

    @Override
    public Integer deletePost(Integer id) {

        return postDao.deletePost(id);
    }

    @Override
    public Post getPostById(Integer id) {

        return postDao.getPostById(id);
    }

}

2.3 DepartmentService 接口与实现

在包 com.shiyanlou.service 下建一个 DepartmentService.java 接口文件，代码如下：

package com.shiyanlou.service;

import java.util.List;
import java.util.Map;

import com.shiyanlou.domain.Department;

public interface DepartmentService {

    /** 根据条件查询部门
     * 
     * @param map
     * @return
     */
    public List<Department> findDepartments(Map<String, Object> map);

    /** 根据条件查询部门数量
     * 
     * @param map
     * @return
     */
    public Integer getCount(Map<String, Object> map);

    /** 添加部门
     * 
     * @param department
     * @return
     */
    public Integer addDepartment(Department department);

    /** 修改部门
     * 
     * @param department
     * @return
     */
    public Integer updateDepartment(Department department);

    /** 删除部门
     * 
     * @param id
     * @return
     */
    public Integer deleteDepartment(Integer id);
}

在包 com.shiyanlou.service.impl 下建一个类 DepartmentServiceImpl 实现上述的接口，代码如下：

package com.shiyanlou.service.impl;

import java.util.List;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.shiyanlou.dao.DepartmentDao;
import com.shiyanlou.domain.Department;
import com.shiyanlou.service.DepartmentService;

@Service("departmentService")
public class DepartmentServiceImpl implements DepartmentService {

    // 自动注入 DAO 对象
    @Resource
    private DepartmentDao departmentDao;

    // 实现接口中的方法

    @Override
    public List<Department> findDepartments(Map<String, Object> map) {

        return departmentDao.findDepartments(map);
    }

    @Override
    public Integer getCount(Map<String, Object> map) {

        return departmentDao.getCount(map);
    }

    @Override
    public Integer addDepartment(Department department) {

        return departmentDao.addDepartment(department);
    }

    @Override
    public Integer updateDepartment(Department department) {

        return departmentDao.updateDepartment(department);
    }

    @Override
    public Integer deleteDepartment(Integer id) {
        Integer flag = null;
        // 如果删除关联外键的行记录，抛出异常
        try {
            flag =  departmentDao.deleteDepartment(id);
        } catch (Exception e) {
            throw new RuntimeException();
        }

        return flag;
    }
}

2.4 PositionService 接口与实现

在包 com.shiyanlou.service 下建一个 PositionService.java 接口文件，代码如下：

package com.shiyanlou.service;

import java.util.List;
import java.util.Map;

import com.shiyanlou.domain.Position;

public interface PositionService {

    /** 根据条件查询职位
     * 
     * @param map
     * @return
     */
    public List<Position> findPositions(Map<String, Object> map);

    /** 根据条件查询职位数量
     * 
     * @param map
     * @return
     */
    public Integer getCount(Map<String, Object> map);

    /** 添加职位
     * 
     * @param position
     * @return
     */
    public Integer addPosition(Position position);

    /* 修改职位
     * 
     * @param position
     * @return
     */
    public Integer updatePosition(Position position);

    /** 删除职位
     * 
     * @param id
     * @return
     */
    public Integer deletePosition(Integer id);
}

在包 com.shiyanlou.service.impl 下建一个类 PositionServiceImpl 实现上述的接口，代码如下：

package com.shiyanlou.service.impl;

import java.util.List;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.shiyanlou.dao.PositionDao;
import com.shiyanlou.domain.Position;
import com.shiyanlou.service.PositionService;

@Service("positionService")
public class PositionServiceImpl implements PositionService {

    // 自动注入 DAO 对象
    @Resource
    private PositionDao positionDao;

    // 实现接口中的方法    

    @Override
    public List<Position> findPositions(Map<String, Object> map) {

        return positionDao.findPositions(map);
    }

    @Override
    public Integer getCount(Map<String, Object> map) {

        return positionDao.getCount(map);
    }

    @Override
    public Integer addPosition(Position position) {

        return positionDao.addPosition(position);
    }

    @Override
    public Integer updatePosition(Position position) {

        return positionDao.updatePosition(position);
    }

    @Override
    public Integer deletePosition(Integer id) {
        Integer flag = null;
        // 如果删除关联外键的行记录，抛出异常
        try {
            flag = positionDao.deletePosition(id);
        } catch (Exception e) {
            throw new RuntimeException();
        }

        return flag;
    }

}

2.5 EmployeeService 接口与实现

在包 com.shiyanlou.service 下建一个 EmployeeService.java 接口文件，代码如下：

package com.shiyanlou.service;

import java.util.List;
import java.util.Map;

import com.shiyanlou.domain.Employee;
import com.shiyanlou.domain.Post;

public interface EmployeeService {

    /** 根据条件查询员工
     * 
     * @param map
     * @return
     */
    public List<Post>findEmployees(Map<String, Object> map);

    /** 根据条件查询员工人数
     * 
     * @param map
     * @return
     */
    public Integer getCount(Map<String, Object> map);

    /** 添加员工
     * 
     * @param employee
     * @return
     */
    public Integer addEmployee(Employee employee);

    /** 修改员工
     * 
     * @param employee
     * @return
     */
    public Integer updateEmployee(Employee employee);

    /** 删除员工
     * 
     * @param id
     * @return
     */
    public Integer deleteEmployee(String id);
}

在包 com.shiyanlou.service.impl 下建一个类 EmployeeServiceImpl 实现上述的接口，代码如下：

package com.shiyanlou.service.impl;

import java.util.List;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.shiyanlou.dao.EmployeeDao;
import com.shiyanlou.domain.Employee;
import com.shiyanlou.domain.Post;
import com.shiyanlou.service.EmployeeService;

@Service("employeeService")
public class EmployeeServiceImpl implements EmployeeService {

    // 自动注入 DAO 对象
    @Resource
    private EmployeeDao employeeDao;

    // 实现接口中的方法

    @Override
    public List<Post> findEmployees(Map<String, Object> map) {

        return employeeDao.findEmployees(map);
    }

    @Override
    public Integer getCount(Map<String, Object> map) {

        return employeeDao.getCount(map);
    }

    @Override
    public Integer addEmployee(Employee employee) {
        Integer flag = null;
        // 如果插入记录主键重复，抛出异常
        try {
            flag =  employeeDao.addEmployee(employee);
        } catch (Exception e) {
            throw new RuntimeException();
        }

        return flag;
    }

    @Override
    public Integer updateEmployee(Employee employee) {

        return employeeDao.updateEmployee(employee);
    }

    @Override
    public Integer deleteEmployee(String id) {

        return employeeDao.deleteEmployee(id);
    }

}

三、实验总结

到这里我们就完成了 Service 层的代码实现，下一节我们将完成 MyBatis 和 Spring 的整合及测试。