Java调用Oracle存储过程

package com.hp.test;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class TestOracleCrud {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Connection ct = null;
        ResultSet rs = null;
        CallableStatement cs=null;//存储过程接口
        try {
            //存储过程代码
            /*create or replace procedure pro2(v_in_empno in number,v_out_ename out varchar2) is
            begin
                    select ename into v_out_ename from emp where empno=v_in_empno;
            end;*/
            //加载驱动
            Class.forName("oracle.jdbc.driver.OracleDriver");
            //获取连接
            ct=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:oracal","scott","");
            //调用存储过程
            cs=ct.prepareCall("call pro2(?,?)");
            cs.setInt(, );
            //给第二个问号注册
            cs.registerOutParameter(, oracle.jdbc.OracleTypes.VARCHAR);
            //执行
            cs.execute();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                rs.close();
                ct.close();
                cs.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}