Paging query, using jdbc-- paging query

package com.htf.demo;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

import com.htf.bean.Emp;
import com.htf.util.DBUtils;
/** 
*  Paging query   
* @author : htf 
*
*/
public class TestPage {
	
	public static final String FIND_BY_PAGE="select * from t_emp limit ?,?";
	
	/**
	 *  Paging query method 
	 * @param pageNumber  Page 
	 * @param pageSize    How many pieces of data to check on a page 
	 * @return 
	 */
	public List<Emp> findByPage(Integer pageNumber,Integer pageSize){
		List<Emp> list=new ArrayList<>();
		
		Connection conn=null;
		PreparedStatement stmt =null;
		ResultSet rs=null;
		
		try {
			
			conn=DBUtils.getConnection();
			stmt=conn.prepareStatement(FIND_BY_PAGE);
			// Page formula ->(pageNumber-1)*pageSize
			stmt.setInt(1, (pageNumber-1)*pageSize);
			stmt.setInt(2, pageSize);
			
			rs=stmt.executeQuery();
			// Query result set , Traverse to the set 
			while(rs.next()) {
				Emp emp=new Emp();
				emp.setEmpno(rs.getInt("empno"));
				emp.setEname(rs.getString("ename"));
				emp.setSal(rs.getDouble("sal"));
				emp.setJob(rs.getString("job"));
				emp.setDeptno(rs.getInt("deptno"));
				list.add(emp);
			}
			
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			// close resource 
			DBUtils.close(conn, stmt, rs);
		}
		
		return list;
	}
	
	public static void main(String[] args) {
		List<Emp> list =new TestPage().findByPage(3, 5);
		System.out.println(list.toString());
	}

}

Entity class Emp

package com.htf.bean;

import java.util.Date;

/**  The employee class 
* @author : htf 
* 
*/
public class Emp {
	
	private Integer empno;
	private String ename;
	private Double sal;
	private String job;
	private Integer deptno;
	private Date hiredate;
	
	
	public Emp(Integer empno, String ename, Double sal, String job,
			Integer deptno, Date hiredate) {
		super();
		this.empno = empno;
		this.ename = ename;
		this.sal = sal;
		this.job = job;
		this.deptno = deptno;
		this.hiredate = hiredate;
	}
	public Emp() {
		super();
		// TODO Auto-generated constructor stub
	}
	
	public Integer getEmpno() {
		return empno;
	}
	public void setEmpno(Integer empno) {
		this.empno = empno;
	}
	public String getEname() {
		return ename;
	}
	public void setEname(String ename) {
		this.ename = ename;
	}
	public Double getSal() {
		return sal;
	}
	public void setSal(Double sal) {
		this.sal = sal;
	}
	public String getJob() {
		return job;
	}
	public void setJob(String job) {
		this.job = job;
	}
	public Integer getDeptno() {
		return deptno;
	}
	public void setDeptno(Integer deptno) {
		this.deptno = deptno;
	}
	public Date getHiredate() {
		return hiredate;
	}
	public void setHiredate(Date hiredate) {
		this.hiredate = hiredate;
	}
	@Override
	public String toString() {
		return "Emp [empno=" + empno + ", ename=" + ename + ", sal=" + sal + ", job=" + job + ", deptno=" + deptno
				+ ", hiredate=" + hiredate + "]";
	}
}