java jdbc 调用 oracle存储过程 返回游标

1.创建测试表
create table users(
userid int primary key,
username varchar2(20),
userpwd  varchar2(20)
);
insert into users values(1,'test','test');
insert into users values(2,'test','test');
insert into users values(3,'test','test');
insert into users values(4,'test','test');
insert into users values(5,'test','test');
insert into users values(6,'test','test');
insert into users values(7,'test','test');
2.创建存储过程
创建包
create or replace package pkg_test
as
  type cursor0 is ref cursor;
  procedure get(p_id int,p_rc out cursor0);
end pkg_test;
 
创建包的内容
create or replace package body pkg_test as
  procedure get(p_id int, p_rc out cursor0) is
  begin
    dbms_output.put_line(p_id);
    open p_rc for
      select userid, username, userpwd from users;
  end get;
end pkg_test;
3.java调用
package com.wei;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
/***
 *
 * 测试 jdbc 连接 oracle 存储过程 返回游标
 *
 * @author wei
 *
 */
public class Main {
 public static void main(String[] args) {
  try {
   DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
   Class.forName("oracle.jdbc.driver.OracleDriver");
   String url = "jdbc:oracle:thin:@127.0.0.1:1521:wei";
   String username = "test";
   String password = "admin";
   Connection conn = DriverManager.getConnection(url, username,
     password);
   String sql = "{call pkg_test.get(?,?)}";
   CallableStatement cstmt = conn.prepareCall(sql);
   cstmt.setInt(1, 1);
   cstmt.registerOutParameter(2, oracle.jdbc.OracleTypes.CURSOR);
  &