本期文章：导入上期文章包装好了的自定义MVC的jar包来进行增删改查的操作，其目的也是测试自定义的MVC的jar包是否能成功使用，并且验证使用自定义的MVC的jar包可以帮助我们减少数据增删改查操作的代码量

目录

1、导入自定义的MVC的jar包

2、编写增删改查的代码

编写前的操作

具体代码实现

Student

IStudentDao

StudentDao

IStudentService（相当于biz层）

StudentService

StudentAction

1、导入自定义的MVC的jar包

• 先创建好项目，然后导入需要用到的jar包

2、编写增删改查的代码

编写前的操作

• 建立一个源码文件夹放入相关文件

• 搭建好结合了MVC的三层架构的框架

具体代码实现

Student

public class Student {
	private Integer sid;	
	private String sname;
	private Integer score;
	private String clazz;
	public Integer getSid() {
		return sid;
	}
	public void setSid(Integer sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public Integer getScore() {
		return score;
	}
	public void setScore(Integer score) {
		this.score = score;
	}
	public String getClazz() {
		return clazz;
	}
	public void setClazz(String clazz) {
		this.clazz = clazz;
	}
	@Override
	public String toString() {
		return "Student [sid=" + sid + ", sname=" + sname + ", score=" + score + ", clazz=" + clazz + "]";
	}	
}

IStudentDao

public interface IStudentDao {	
	List<Student> getStudents(Student student, PageBean pageBean);
	void addStudent(Student student);
}

StudentDao

public class StudentDao implements IStudentDao {
	@Override
	public List<Student> getStudents(Student stu, PageBean pageBean) {
		String sql = "select sid,sname,score,class,VERSION from t_student";		
		List<Object> param = new ArrayList<>();
		if(stu != null 
				&& stu.getSname() != null 
				&& !"".equals(stu.getSname())) {
			sql += " where sname like ?";
			param.add(stu.getSname()+"%");
		}		
		return BaseDao.query(sql, param, pageBean, new ICovent<Student>() {
			@Override
			public List<Student> convent(ResultSet rs) throws SQLException {
				List<Student> list = new ArrayList<>();
				while(rs.next()) {
					Student student = new Student();
					student.setSid(rs.getInt("sid"));
					student.setSname(rs.getString("sname"));
					student.setScore(rs.getInt("score"));
					student.setClazz(rs.getString("class"));
					list.add(student);
				}
				return list;
			}			
		});
	}	
	@Override
	public void addStudent(Student student) {
		String sql = "insert into t_student(sname, score, class)values(?,?,?)";
		Connection con = null;
		PreparedStatement ps = null;
		try {
			con = DBUtil.getConection();
			ps = con.prepareStatement(sql);		
			ps.setObject(1, student.getSname());
			ps.setObject(2, student.getScore());
			ps.setObject(3, student.getClazz());			
			ps.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			DBUtil.closeDB(null, ps, con);
		}
	}
	@Test
	public void testGetStudent() {
		Student student = new Student();
		List<Student> list = getStudents(student,new PageBean());
		list.forEach(t->System.out.println(t));
	}
}

IStudentService（相当于biz层）

public interface IStudentService {
	List<Student> getStudents(Student stu, PageBean pageBean);
	void addStudent(Student student);
}

StudentService

public class StudentService implements IStudentService {	
	private IStudentDao dao = new StudentDao();
	@Override
	public List<Student> getStudents(Student stu, PageBean pageBean) {
		return dao.getStudents(stu, pageBean);
	}	
	@Override
	public void addStudent(Student student) {
		dao.addStudent(student);
	}
}

StudentAction

public class StudentAction extends AbstractAction implements ModelDrive {	
	private Student student = new Student();	
	private StudentService service = new StudentService();
	@Override
	public Object getModel() {
		return student;
	}
	private IStudentService service = new StudentService();
	public String getStudents(HttpServletRequest req, HttpServletResponse resp) {
		PageBean pageBean = new PageBean();
		pageBean.setRequest(req);
		List<Student> students = service.getStudents(student, pageBean);
		req.setAttribute("students", students);
		return "students";
	}
	public String addStudent(HttpServletRequest req, HttpServletResponse resp) {	
		service.addStudent(student);
		return "success";
	}
}