jdbc中调用oracle 返回游标类型的存储过程

1、创建表：
     create table stud(
            sid int,
            sname varchar2(50)
     )
     并插入一条数据
     insert into stud values(1,'Tom')
2、通过包定义一个游标
 
     create or replace package pack_stud
     is
     --声明一个游标类型
            type cur is ref cursor;
     end;
3、创建存储过程
     create or replace procedure pro_select_stud(
            my_cur out pack_stud.cur
     )
     is
     begin
            open my_cur for select * from stud;
     end;
4、jdbc中调用
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import oracle.jdbc.driver.OracleTypes;
 
public class TestProCur {
 public void test(){
  Connection con = null;
  ResultSet rs = null;
  CallableStatement cst = null;
  try{
         Class.forName("oracle.jdbc.driver.OracleDriver");
         //下面的tan是数据库名，默认是orcl，love是访问密码，默认是tiger,
         //1521是端口号，默认是1521
        con = DriverManager.getConnection   ("jdbc:oracle:thin:@192.168.1.103:1521:tan","scott","love");
        String sql = "{call  pro_select_stud(?)}";
       &nbs