把mysql中的记录封装成集合

package cn.hu3.com;
import cn.hu1.com.JdbcUtils;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
public class DemoStudent {
 public static void main(String[] args) throws SQLException {
 // 创建对象
 Connection conn = JdbcUtils.getConnection();
 PreparedStatement ps = conn.prepareStatement("select * FROM emppme");
 // 设置参数
 ResultSet rs = ps.executeQuery();
 ArrayList<emppme> al = new ArrayList<emppme>();
 while(rs.next()){
// 把记录封装成对象
 emppme em = new emppme();
 em.setId(rs.getInt("id"));
 em.setUname(rs.getString("uname"));
 em.setGender(rs.getBoolean("gender"));
// 把对象添加到集合中
 al.add(em);
 }
 JdbcUtils.close(rs,ps,conn);
//遍历集合
 for(emppme ep:al){
 System.out.println(ep);
 }
 }
}

package cn.hu3.com;
public class emppme {
    private  int id;
 private String uname;
 private boolean gender;
 @Override
 public String toString() {
 return "emppme{" +
 "id=" + id +
 ", uname='" + uname + '\'' +
 ", gender=" + gender +
 '}';
 }

 public int getId() {
 return id;
 }

 public void setId(int id) {
 this.id = id;
 }

 public String getUname() {
 return uname;
 }

 public void setUname(String uname) {
 this.uname = uname;
 }

 public boolean isGender() {
 return gender;
 }

 public void setGender(boolean gender) {
 this.gender = gender;
 }
}

package cn.hu1.com;

import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.sql.*;
import java.util.Properties;

/**
 * JDBC工具类
 * */
public class JdbcUtils {
 private static String url;
 private static String user;
 private static String password;
 private static String driver;
 // 文件的读取 读取一次拿到所有值 使用静态代码块
 static{
 try {
 // 读取资源文件 获取值 创建Properties 集合类
 Properties pro = new Properties();
 // 获取src的路径----》ClassLoader() 类加载器
 ClassLoader classLoader = JdbcUtils.class.getClassLoader();
 URL res = classLoader.getResource("jdbc.properties");
 String path = res.getPath();
 pro.load(new FileReader(path));
 url=pro.getProperty("url");
 user=pro.getProperty("user");
 password=pro.getProperty("password");
 driver=pro.getProperty("driver");

 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 //获取链接对象
 public static Connection getConnection() throws SQLException {
 return DriverManager.getConnection(url,user,password);
 }
 //释放资源
 public static void close(Statement stmt,Connection conn){
 if(stmt!=null){
 try {
 stmt.close();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }
 if(conn!=null){
 try {
 conn.close();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }
 }
 //释放资源
 public static void close(ResultSet rs,Statement stmt, Connection conn){
 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();
 }
 }
 }
}

url=jdbc:mysql:///qy97
user=root
password=root
driver=com.mysql.jdbc.Driver