java中调用存储过程或函数

package com.dgy.app;  
  
import java.sql.CallableStatement;  
import java.sql.Connection;  
import java.sql.DriverManager;  
import java.sql.SQLException;  
import java.sql.Types;  
  
  
public class OraclePro {  
    /** 
     * 连接数据库 
     */  
    public static Connection getConnection(){  
         Connection con = null;  
         try {  
            Class.forName("oracle.jdbc.driver.OracleDriver");  
            String url = "jdbc:oracle:thin:@PC-200911181406:1521:dgy";  
            String user = "dwj";  
            String pwd = "dwj";           
            con = DriverManager.getConnection(url,user,pwd);  
        } catch (ClassNotFoundException e) {  
            e.printStackTrace();  
        } catch (SQLException e) {  
            e.printStackTrace();  
        }  
        return con;  
    }  
    public static void main(String[] args) throws SQLException {  
         //System.out.println(OraclePro.getConnection());         
        Connection con=OraclePro.getConnection();  
        CallableStatement cs=con.prepareCall("{?=call get_pname}");//没有参数的函数  
        cs.registerOutParameter(1, Types.VARCHAR);//第一个占位为输出，类型是varchar  
        cs.execute();                  //不能忘记execute()  
        System.out.println(cs.getString(1)); //打印输出结果，对应registerOutParameter  
    }  
}  

//有1个输入参数的函数          
CallableStatement cs=con.prepareCall("{?=call get_pname1(?)}");  
cs.registerOutParameter(1, Types.VARCHAR);  
cs.setLong(2,25);     //输入参数是25  
cs.execute();  
  
//有1个输出参数的函数      
CallableStatement cs=con.prepareCall("{?=call get_pname2(?)}");  
cs.registerOutParameter(1, Types.VARCHAR);  
cs.registerOutParameter(2, Types.VARCHAR);  
cs.execute();  
System.out.println(cs.getString(1));  
System.out.println(cs.getString(2));  
//上面两个结果一样，因为两个意思是一样的  
  
//1个输入参数，1个输出参数       
CallableStatement cs=con.prepareCall("{?=call get_pname3(?,?)}");  
//第1个是返回值，第2个是输入参数，第3个是输出参数       
cs.registerOutParameter(1, Types.VARCHAR);  
cs.setLong(2, 25);    
cs.registerOutParameter(3, Types.VARCHAR);        
cs.execute();  
System.out.println(cs.getString(1));  
System.out.println(cs.getString(3));