JAVA 调用mysql存储过程

public class Test {
    //连接mysql数据库
    public static final String DRIVER_CLASS = "com.mysql.jdbc.Driver";
    public static final String URL = "jdbc:mysql://localhost/bailv_case";
    public static final String USERNAME = "root";
    public static final String PASSWORD = "root";
    public static void main(String[] args) throws Exception {
        test1();
        test2();
    }
 
    public static void test1() throws Exception
    {
        Class.forName(DRIVER_CLASS);
        Connection connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        String sql = "{CALL gq_hs()}"; //调用存储过程CALL gq_hs()

        CallableStatement cstm = connection.prepareCall(sql); //实例化对象cstm
//        cstm.setString(1, "myd"); //存储过程输入参数
        //cstm.setInt(2, 2); // 存储过程输入参数 
//        cstm.registerOutParameter(2, Types.INTEGER); // 设置返回值类型 即返回值
        cstm.execute(); // 执行存储过程 
        System.out.println("成功");
        cstm.close();
        connection.close();
    }
 
    public static void test2() throws Exception
    {
        Class.forName(DRIVER_CLASS);
        Connection connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        String sql = "{CALL out_in(?,?)}"; //调用存储过程CALL out_in(?,?)有参

        CallableStatement cstm = connection.prepareCall(sql); //实例化对象cstm 
          cstm.setInt(1,2); // 存储过程输入参数
//        cstm.setInt(2,2); // 存储过程输入参数
        cstm.registerOutParameter(2, Types.INTEGER); // 设置返回值类型 即返回值
        cstm.execute(); // 执行存储过程 
        System.out.println("成功"+cstm.getInt(2));
        cstm.close();
        connection.close();
 
    }