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1.要获取student表中的数据，先建一个Student类

//封装Student表数据的JavaBeanpublic class Student {
   	private int id;	private String name;	private int fenshu;	public int getId() {
   		return id;	}	public void setId(int id) {
   		this.id = id;	}	public String getName() {
   		return name;	}	public void setName(String name) {
   		this.name = name;	}	public int getFenshu() {
   		return fenshu;	}	public void setFenshu(int fenshu) {
   		this.fenshu = fenshu;	}	@Override	public String toString() {
   		return "Student [id=" + id + ", name=" + name + ", fenshu=" + fenshu + "]";	}	}

2.实现

import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.ArrayList;import java.util.List;public class JdbcDemo05 {
   	public static void main(String[] args) {
   		List
   
     list=new JdbcDemo05().findAll();		System.out.println(list);		System.out.println(list.size());	}	public List
    
     findAll(){
   		Connection conn = null;        Statement stmt = null;        ResultSet rs = null;        List
     
       list=null;       		try {
   			//1.注册驱动			Class.forName("com.mysql.cj.jdbc.Driver");			//2.获取数据库的连接对象		try {
   			conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/ceshi?serverTimezone=GMT%2B8", "root","123456");			//3.定义sql		  String sql= "select * from student";		   //4.获取执行sql的对象		  stmt = conn.createStatement();		  //5.执行sql		  rs=stmt.executeQuery(sql);		//6.遍历结果集，封装对象，装载集合		  Student student=null;		  list=new ArrayList
      
       ();		  while(rs.next()) {
   			  //获取数据			  int id=rs.getInt("id");			  String name=rs.getString("name");			  int fenshu=rs.getInt("fenshu");			  //创建student对象，并赋值			  student =new Student();			  student.setId(id);			  student.setName(name);			  student.setFenshu(fenshu);			  //装载集合              list.add(student);		  }		  		  		} catch (SQLException e) {
   			// TODO Auto-generated catch block			e.printStackTrace();		}										} catch (ClassNotFoundException e) {
   			// TODO Auto-generated catch block			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;			}}
      
     
    
   

3.结果

[Student [id=1, name=张三, fenshu=99], Student [id=2, name=李四, fenshu=99], Student [id=3, name=wangwu, fenshu=2000]]3

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