学习笔记，自己写的一个service层和dao层，记录一下，这方面刚入门，有不对的地方还请大佬们指出
目录
- 项目结构
- 实体类
- dao层接口
- dao层实现类
- service层接口
- service层实现类
- 测试类
这里就以Student实体类为例
项目结构
实体类
添加属性和属性对应的get，set方法，有参无参构造方法，toString()方法
package entity;public class Student {
private int stuNo;
private String name;
private String sex;
private String address;
private int age;
private String phone;
public Student() {
}
public Student(int stuNo, String name, String sex, String address, int age, String phone) {
this.stuNo = stuNo;
this.name = name;
this.sex = sex;
this.address = address;
this.age = age;
this.phone = phone;
}
public int getStuNo() {
return stuNo;
}
public void setStuNo(int stuNo) {
this.stuNo = stuNo;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "Student{" +
"stuNo=" + stuNo +
", name='" + name + '\'' +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
", age=" + age +
", phone='" + phone + '\'' +
'}';
}}dao层接口
根据实体类创建增删改查学生信息的方法
package dao.student;import entity.Student;public interface StudentDao {
void addInfo(Student student);
void deleteInfo(int stuNo);
void updateInfo(Student student);
Student findInfo(int stuNo);}dao层实现类
实现dao层接口，直接对数据库进行操作
package dao.student.studentImpl;import dao.student.StudentDao;import entity.Student;public class StudentDaoImpl implements StudentDao {
Student student = new Student();
@Override
public void addInfo(Student student) {
}
@Override
public void deleteInfo(int stuNo) {
}
@Override
public void updateInfo(Student student) {
}
@Override
public Student findInfo(int stuNo) {
return student;
}}service层接口
根据实际需求，在dao层接口中选择方法创建
package service.student;import entity.Student;public interface StudentService {
void addInfo(Student student);
void deleteInfo(int stuNo);
void updateInfo(Student student);
Student findInfo(int stuNo);}service层实现类
实现service层接口，不直接对数据库进行操作，通过dao层实现类对数据库进行操作(直接对数据库进行操作的只有dao层实现类)
package service.student.studentImpl;import dao.student.studentImpl.StudentDaoImpl;import entity.Student;import service.student.StudentService;public class StudentServiceImpl implements StudentService {
StudentDaoImpl studentDaoImpl = new StudentDaoImpl();
@Override
public void addInfo(Student student) {
studentDaoImpl.addInfo(student);
}
@Override
public void deleteInfo(int stuNo) {
studentDaoImpl.deleteInfo(stuNo);
}
@Override
public void updateInfo(Student student) {
studentDaoImpl.updateInfo(student);
}
@Override
public Student findInfo(int stuNo) {
return studentDaoImpl.findInfo(stuNo);
}}测试类
package test;import entity.Student;import service.student.studentImpl.StudentServiceImpl;public class MyTest {
public static void main(String[] args) {
StudentServiceImpl serviceImpl = new StudentServiceImpl();
Student student = new Student();
student.setName("张三");
student.setAddress("上海");
student.setAge(15);
student.setPhone("123");
student.setStuNo(123);
student.setSex("男");
serviceImpl.addInfo(student);
}}
训练营
