user=root
password=abc123
url=jdbc:mysql://localhost:3306/test
driverClass=com.mysql.jdbc.Driver

Class.forName(driverClass);
Connection connection = DriverManager.getConnection(url, user, password);
String sql = "select * from jdbc where id = ?";
PreparedStatement preparedStatement = connection.prepareStatement(sql);
preparedStatement.setObject(1,1);//多个可以循环遍历填充占位符，索引从1开始

ResultSet resultSet = preparedStatement.executeQuery();//返回结果集

ResultSetMetaData metaData = resultSet.getMetaData();//元数据

int columnCount = metaData.getColumnCount();//获取结果集的列数

if(resultSet.next()) {

    Student student = new Student();
    for (int i = 0;i < columnCount;i++) {
       //结果集中获取列数据
        Object columValue = resultSet.getObject(i + 1);

        //元数据中获取列名
        String columnName = metaData.getColumnName(i + 1);

        Field field = Student.class.getDeclaredField(columnName);
        field.setAccessible(true);
        field.set(student,columValue);

    }
return student;
}
//关闭preparedStatement 

preparedStatement.close;

//关闭connection 

connection.close;