使用jdbc，查询数据库数据，并将其封装为对象输出

package cn.itcast.jdbc;

import cn.itcast.domain.User;

import java.sql.*;import java.util.ArrayList;import java.util.List;

/** * @author newcityman * @date 2019/8/13 - 23:27 */public class JDBCDemo06 {

    public static void main(String[] args) {        JDBCDemo06 demo06 = new JDBCDemo06();        demo06.findAll();    }

    public List<User> findAll() {        Connection conn = null;        Statement stmt = null;        ResultSet rs = null;        List<User> list = null;        try {            Class.forName("com.mysql.jdbc.Driver");            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day13", "root", "123");            stmt = conn.createStatement();            String sql = "select * from user";            rs = stmt.executeQuery(sql);            list = new ArrayList<User>();            User user = null;            //遍历集合            while (rs.next()) {                int id = rs.getInt("id");                String username = rs.getString("username");                String password = rs.getString("password");                String sex = rs.getString("sex");                Date birthday = rs.getDate("birthday");                String hobbys = rs.getString("hobbys");                String des = rs.getString("des");                //封装对象                user = new User();                user.setId(id);                user.setUsername(username);                user.setPassword(password);                user.setSex(sex);                user.setBirthday(birthday);                user.setHobbys(hobbys);                user.setDes(des);                //装载集合                list.add(user);            }            System.out.println(list);        } catch (ClassNotFoundException e) {            e.printStackTrace();        } catch (SQLException e) {            e.printStackTrace();        } finally {            if (rs != null) {                try {                    rs.close();                } catch (SQLException e) {                    e.printStackTrace();                }            }            if (stmt != null) {                try {                    stmt.close();                } catch (SQLException e) {                    e.printStackTrace();                }            }            if (conn != null) {                try {                    conn.close();                } catch (SQLException e) {                    e.printStackTrace();                }            }        }        return list;    }}

原文地址：https://www.cnblogs.com/newcityboy/p/11349394.html