JAVA 調用mysql存儲過程

public class Test {
    //連接mysql數據庫
    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()}"; //調用存儲過程CALL gq_hs()

        CallableStatement cstm = connection.prepareCall(sql); //實例化對象cstm
//        cstm.setString(1, "myd"); //存儲過程輸入參數
        //cstm.setInt(2, 2); // 存儲過程輸入參數 
//        cstm.registerOutParameter(2, Types.INTEGER); // 設置返回值類型 即返回值
        cstm.execute(); // 執行存儲過程 
        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(?,?)}"; //調用存儲過程CALL out_in(?,?)有參

        CallableStatement cstm = connection.prepareCall(sql); //實例化對象cstm 
          cstm.setInt(1,2); // 存儲過程輸入參數
//        cstm.setInt(2,2); // 存儲過程輸入參數
        cstm.registerOutParameter(2, Types.INTEGER); // 設置返回值類型 即返回值
        cstm.execute(); // 執行存儲過程 
        System.out.println("成功"+cstm.getInt(2));
        cstm.close();
        connection.close();

    }